Narrow solar-light response range and rapid charges recombination are the main technical barriers in TiO_(2) photocatalysis technology.To overcome these restrictions,in this work we synthesized a novel binuclear gadol...Narrow solar-light response range and rapid charges recombination are the main technical barriers in TiO_(2) photocatalysis technology.To overcome these restrictions,in this work we synthesized a novel binuclear gadolinium(Ⅲ) coordination complex,[Gd_(2)(DPDB)_6(DMF)_6(H_(2)O_()2)](DPDB=[(4-dimethylamino)phenyldiazenyl] benzenesulfonate),which was used as an inorganic sensitizer for boosting the visible light-harvesting and quantum efficiency of TiO_(2) supported-reduced graphene oxide(rGO) nanocomposite.Crystal structure of [Gd_(2)(DPDB)_6(DMF)_6(H_(2)O)_(2)](Gd-CMP) was determined from single-crystal X-ray diffraction data,which indicates three-dimensional(3D) supramolecular architecture through hydrogen bonding and CH…π_(ph) interactions.The prepared nanohybrid(Gd-CMP/TG) reveals significantly enhanced visible-light-induced photocatalytic activity for degradation of acetaminophen(ACT).The complete removal of 10 mg/L ACT is achieved over Gd-CMP/TG,and the corresponding rate constant of ACT degradation of nanohybrid is 40-fold higher than that of bare TiO_(2).In prepared ternary nanohybrid,metal-coordination sensitizer(Gd-CMP) acts as an electron donor,and at the same time,rGO serves as an electron acceptor,and the synergistic effect between them efficiently enhances charges separation and inhibits e/h pair recombination in the hybridized species.The radical scavenger tests indicate that the photo-induced O_(2)^(-·) radicals dominate ACT degradation.On the basis of the experimental results and calculated energy of electronic levels,a possible mechanism for the improved photocatalytic activity is discussed.展开更多
With the development of coal chemical industry,large amounts of naphthalene and n-butene are produced,and converting them into high value-added products through alkylation has gained particular importance and interest...With the development of coal chemical industry,large amounts of naphthalene and n-butene are produced,and converting them into high value-added products through alkylation has gained particular importance and interest.In this work,liquid coordination complexes(LCCs)were used as acid catalysts for the first time in the naphthalene alkylation reaction under mild conditions to obtain multibutylnaphthalenes with high yield.Various reaction conditions were thoroughly investigated.The LCC consisting of urea and AlCl_(3) showed excellent catalytic performance under optimal reaction conditions,giving 100%conversion of naphthalene and 99.66%selectivity towards multi-butylnaphthalenes.Combining the catalyst properties and catalytic results,a plausible reaction mechanism was proposed.The lubricating properties of the synthesized products were investigated for their potential application as lubricating base oils.The synthesized multi-butylnaphthalenes showed comparable physicochemical properties and tribological performances as the commercial cycloalkyl base oil.展开更多
Two new hydrostable two-dimensional(2 D)uranyl coordination complexes[(UO_(2))_(5)(μ_(3)-O)_(2)(nbca)_(2)].7 H_(2)O(1)and[(UO_(2))_(3)(nbca)_(2)(H_(2)O)_(3)]·2 H_(2)O(2)(H_(3)nbca=5-nitro-1,2,3-benzenetricarboxy...Two new hydrostable two-dimensional(2 D)uranyl coordination complexes[(UO_(2))_(5)(μ_(3)-O)_(2)(nbca)_(2)].7 H_(2)O(1)and[(UO_(2))_(3)(nbca)_(2)(H_(2)O)_(3)]·2 H_(2)O(2)(H_(3)nbca=5-nitro-1,2,3-benzenetricarboxylic acid)were hydrothermal synthesized.Single-crystal structural refinements reveal that both of the two complexes were formed by the packing of 2D uranyl coordination sheets via the hydrogen bonds.The nbca ligand coordinating to the uranyl polyhedron centers constructed the 2D sheets.There are UO8 hexagonal bipyramids and UO7 pentagonal bipyramids in 1 while only U07 pentagonal bipyramids in 2.Photocatalytic degradation of rhodamine B(RhB)in aqueous solution was studied.Complex 2 possesses better performance than 1 with 96.2%of the RhB was degraded in only 60 min.Mechanism studies reveal that the dissolved oxygens are essential to the RhB degradation.The photocurrent density of 2 is more stable than that of 1,which indicating the stronger ability to separate photoexcited electrons and hole pairs of 2.展开更多
Two 1D coordination polymers[Ln2(dpdc)3(tpy)2·H2O]n[Ln=Nd 1,Yb 2,H2dpdc=2,2'-biphenyldicarboxylic acid and tpy=2,2':6',2''-terpyridine]and one dinuclear complex Er2(dpdc)2(Hdpdc)2(tpy)23 were ...Two 1D coordination polymers[Ln2(dpdc)3(tpy)2·H2O]n[Ln=Nd 1,Yb 2,H2dpdc=2,2'-biphenyldicarboxylic acid and tpy=2,2':6',2''-terpyridine]and one dinuclear complex Er2(dpdc)2(Hdpdc)2(tpy)23 were obtained via hydrothermal reactions and determined by X-ray diffraction analysis.The crystal structure data of 1 and 2 revealed that two coordination polymers were isostructural and possessed a 1D chain framework consisting of eight-coordinated Ln(III)centers.In the asymmetric unit,the two Er(III)ions in 3 were both nine-coordinated and had similar coordination environments.The Er(III)ions were bridged by dpdc2-ligands into dinuclear structures.The complexes were also characterized by IR spectra and thermogravimetric analysis.The solid fluorescence of 1 and 3 was also investigated at room temperature.展开更多
Two coordinate reactions,NdCl 3·6H 2O(s)+3CCl 3COOH(s)(or TCA)=Nd(TCA)3·3H 2O(s)+3HCl(g)+3H 2O(l)and Nd(TCA)3·3H 2O(s)+2C 9H 7NO(s)=Nd(TCA)(C 9H 6NO)2(s)+2CCl 3COOH(s)+3H 2O(l),were studied by the class...Two coordinate reactions,NdCl 3·6H 2O(s)+3CCl 3COOH(s)(or TCA)=Nd(TCA)3·3H 2O(s)+3HCl(g)+3H 2O(l)and Nd(TCA)3·3H 2O(s)+2C 9H 7NO(s)=Nd(TCA)(C 9H 6NO)2(s)+2CCl 3COOH(s)+3H 2O(l),were studied by the classical solution calorimetry at 298.15K.The molar dissolution enthalpies of the reactants and the products in certain solvent(the first reaction in 1 mol·L-1 HCl,the second in a mixed solution consisting of absolute ethyl alcohol,dimethyl sulfoxide and 4 mol·L-1 HCl)were measured by using an isoperibol calorimeter at 298.15K.From the results and other auxiliary quantities,the standard molar formation enthalpies of[Nd(TCA)3·3H 2O,s,298.15K]and[Nd(TCA)(C 9H 6NO)2,s,298.15K]are determined asΔfH m°[Nd(TCA)3·3H 2O,s,298.15K]=-3053.3 kJ·mol-1 andΔfH m°[Nd(TCA)(C 9H 6NO)2,s,298.15K]=-1355.6 kJ·mol-1.展开更多
A new coordination complex [Cd(pda)(pyz)(H2O)2]n(1, H2 pda = 1,4-phenylenediacetic acid, pyz = pyrazine) have been synthesized and structurally characterized. Crystal data for the title complex are as follows: orthorh...A new coordination complex [Cd(pda)(pyz)(H2O)2]n(1, H2 pda = 1,4-phenylenediacetic acid, pyz = pyrazine) have been synthesized and structurally characterized. Crystal data for the title complex are as follows: orthorhombic system, space group Ccmb with a = 11.5245(3) b = 19.5069(5) c = 11.4231(3) A, V = 2568.00(12) A3, Mr = 188.31, Z = 16, F(000) = 1480, Dc = 1.948 g/cm3, μ(Mo Kα) = 1.725 mm-1, R = 0.0195 and w R = 0.0462 for 1357 observed reflections with I 】 2σ(I). In the title complex, the central Cd(II) ion is located in a distorted octahedral coordination environment. Two Cd(II) ions are bridged by two pda2- ligands and one pyz ligand to form a bi-loop structure. Luminescent property of the complex has also been studied.展开更多
With the increase of people’s demand,it is extremely desired for developing high-safety,widetemperature-range and high-energy-density lithium batteries,but huge challenges are remained due to shrinkage and combustion...With the increase of people’s demand,it is extremely desired for developing high-safety,widetemperature-range and high-energy-density lithium batteries,but huge challenges are remained due to shrinkage and combustion of commonly used polyolefin separators at high temperatures,as well as narrow usable temperature range and high flammability of conventionally commercialized liquid electrolytes.In this work,we report a multifunctional separator mainly consisting of Zn^(2+)-phytate coordination complex nanoparticles and bacterial cellulose nanofibers,named the BZP separator,which possesses high porosity,excellent thermotolerance,good flame retardancy,abilities of anion binding and Ni^(2+)capturing.Through cooperating with the fluoride-free wide-temperature-range electrolyte,Li//LiFePO_(4) cells not only deliver discharge capacities of 110.39 mA h g^(-1)and 113.25 mA h g^(-1)after 2200 cycles (2 C) and1600 cycles (5 C) at 25℃,with capacity retentions of 76.59%and 86.09%,respectively,but also exhibit excellent cycling performance at 80℃ and-40℃.Significantly,the Li//NCM811 cell with a loading of7.8 mg cm^(-2)delivers a discharge capacity of 146.64 mA h g^(-1)after 200 cycles at 0.5 C,with a capacity retention of 89.03%.In addition,pouch cells can work at 120℃ and have low flammability.展开更多
By simulating the electron paramagnetic resonance （EPR） and optical spectra on the basis of the 120 × 120 complete energy matrix, this paper determines the local lattice structure parameters R1 and R2 for MCl...By simulating the electron paramagnetic resonance （EPR） and optical spectra on the basis of the 120 × 120 complete energy matrix, this paper determines the local lattice structure parameters R1 and R2 for MCl：V2＋ （M=Na, K, Rb） systems at 77K, 195 K and RT （room temperature 295 K or 302 K）, respectively. The theoretical results indicate that there exists a compressed distortion in MCl：V2＋ systems. Meanwhile, it finds that the structure parameters R1, R2 and ｜△R｜（ = R1 - R2） increase with the rising temperature. Subsequently, from the analysis it concludes that the relation of EPR parameter D vs. △R is approximately linear. Finally, the effects of orbital reduction factor k on the g factors for the three systems have been discussed.展开更多
Two new transition metal compounds, [Mn（dpa）2（tmd）2]n （1, H2dpa = 4-hydroxy-phenyl-acetic acid, tmd = 4,4-trimethylenedipyridine） and [Co4（dpa）6（tmd）4（H2O）4]n·nH2O·nCl2 （2）, have been synthesiz...Two new transition metal compounds, [Mn（dpa）2（tmd）2]n （1, H2dpa = 4-hydroxy-phenyl-acetic acid, tmd = 4,4-trimethylenedipyridine） and [Co4（dpa）6（tmd）4（H2O）4]n·nH2O·nCl2 （2）, have been synthesized by hydrothermal synthesis. Compound 1 crystallizes in the monoclinic system, space group P21/n with a = 9.828（3）, b = 17.493（5）, c = 11.616（4）, β = 110.146（6）o, V = 1874.9（10）3, C42H42MnN4O6, Mr = 753.74, Z = 2, Dc = 1.335 g/cm3, μ = 0.406 mm-1, F（000） = 790, the final R = 0.1047 and wR = 0.2021 for 2698 observed reflections （I 〉 2σ（I））. Compound 2 crystallizes in the monoclinic system, space group P21/c with a = 11.7214（13）, b = 17.1582（19）, c = 24.625（3）, β = 103.055（3）o, V = 4824.4（9）3, C100H104Cl2Co4N8O23, Mr = 2094.55, Z = 2, Dc = 1.443 g/cm3, μ = 0.809 mm-1, F（000） = 2180, the final R = 0.0550 and wR = 0.0673 for 4104 observed reflections （I 〉 2σ（I））. These complexes were characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. The structural analyses show that the two compounds are both one-dimensional chain structures. However, compounds 1 and 2 form threedimensional supramolecular structures by hydrogen bonds, respectively.展开更多
Two new cobalt（II） coordination complexes, namely [Co（HL）2（biim）（H2O）2]n·n H2O（1） and [Co（Et L）2（biim）]n·3 n（H2O）·2 n（Et HL）（2）（H2L =（fluorene-9,9-diyl）dipropanoic acid, biim = 1,...Two new cobalt（II） coordination complexes, namely [Co（HL）2（biim）（H2O）2]n·n H2O（1） and [Co（Et L）2（biim）]n·3 n（H2O）·2 n（Et HL）（2）（H2L =（fluorene-9,9-diyl）dipropanoic acid, biim = 1,3-bis（imidazol-1-yl）butane）, have been synthesized using the same starting reactants but different solvent medium. The two complexes exhibit distinctly different structures. Compound 1 exhibits a one-dimensional linear chain structure. However, complex 2 reveals a one-dimensional zigzag chain structure. Thermogravimetric analyses（TGA） and luminescent properties of these two complexes have been discussed.展开更多
The 1-D chain coordination complex of {[Mn2（HCAM）3（H2bipy）]·5H2O}n （H3CAM = 4-hydroxypyridine-2,6-dicarboxylic acid, bipy = 4,4＇-bipyridine） has been synthesized by the reaction of 4-hydroxypyridine-2,6-di...The 1-D chain coordination complex of {[Mn2（HCAM）3（H2bipy）]·5H2O}n （H3CAM = 4-hydroxypyridine-2,6-dicarboxylic acid, bipy = 4,4＇-bipyridine） has been synthesized by the reaction of 4-hydroxypyridine-2,6-dicarboxylic acid, 4,4＇-bipyridine and manganese carbonate under hydrothermal conditions, and its crystal structure was determined by X-ray diffraction method The crystal belongs to the monoclinic system, space group P21/n with a = 10.110（2）, b = 20.159（4）, c = 17.861（4）A,β = 99.67（3）°, V = 3.5884（12） nm3, Mr= 901.47, Z = 4, Dc= 1.669 g.cm^-3, μ= 0.798 mm^-1, F（000） = 1840, the final R = 0.0713 and ωR = 0.1853. The complex forms a 1-D chain bridged by HCAM, protonated 4,4-bipyridines link the 1-D chains to construct 2-D networks via N-H...O hydrogen bonds, and networks are further extended via π-π stacking and hydrogen bonds into 3-D supramolecular framework.展开更多
A novel coordination complex,{[Cd）2（C（20）H（10）O5）2（H2O）4]·10H2O}n,has been synthesized based on fluorescein（2-（6-hydroxy-3-oxo-3 H-xanthen-9-yl） benzoic acid） and systematically characterized by elem...A novel coordination complex,{[Cd）2（C（20）H（10）O5）2（H2O）4]·10H2O}n,has been synthesized based on fluorescein（2-（6-hydroxy-3-oxo-3 H-xanthen-9-yl） benzoic acid） and systematically characterized by elemental analysis,infrared（IR） spectrum,thermo gravimetric analysis（TGA）,powder X-ray diffraction（PXRD） and single-crystal X-ray diffraction.Compound 1 crystallizes in monoclinic,space group P2/n with a = 20.428（5）,b = 8.084（2）,c = 21.689（5）A,β = 96.360（5）°,Mr = 993.46,V = 3559.7（15）A^3,Z = 4,Dx = 1.845 g/cm^3,μ = 1.276 mm^-1,F（000） = 1974,GOOF = 1.044,λ（Mo Kα） = 0.71073 ？,the final R = 0.0553 and wR = 0.1720 for 7245 observed reflections with I 〉 2σ（I）.展开更多
The eigenspectrum and eigenvectors of the ^(2)F_(7/2) ground multiplets of two structural isomer coordination complexes,Yb(trenovan)(H_(3)trenovan=tris(((3-methoxysalicylidene)amino)ethyl)amine)and Yb(trenpvan)(H_(3)t...The eigenspectrum and eigenvectors of the ^(2)F_(7/2) ground multiplets of two structural isomer coordination complexes,Yb(trenovan)(H_(3)trenovan=tris(((3-methoxysalicylidene)amino)ethyl)amine)and Yb(trenpvan)(H_(3)trenpvan=tris(((5-methoxysalicylidene)amino)ethyl)amine),were determined by use of magnetometry,electron paramagnetic resonance and luminescence spectroscopies.The two 4f complexes crystallise in the trigonal P3space group,have identical chemical formulas and differ only in the placement of the methoxy group on the aromatic ring of salicylaldehyde,with it being either ortho,Yb(trenovan),or para,Yb(trenpvan),to the phenoxo group.This structural isomerism is found to have a profound influence on the solid state static and dynamic magnetic properties of the complexes.In the bulk,both isomers display a combination of direct and Raman magnetisation relaxation proccesses,however,at vastly different rates.Magnetic dilution in an isostructural diamagnetic host supresses the occurrence of the direct process suggesting that the direct process observed in the bulk originates from Yb_((III))centres coupled by magnetic dipole interactions.The eigenspectrum,eigenvectors and spin lattice relaxation of Yb(trenpvan)are found to be closer to the ones found in Yb(trensal)(H_(3)trensal=tris(((salicylidene)amino)ethyl)amine)where the methoxy group is substituted by an H atom,than to those of Yb(trenovan)where the methoxy group is in the ortho position.Thus,the position of chemical modifications has a tremendous influence on the static and dynamic solid state magnetic properties of 4f coordination complexes.Our detailed study on single crystals,demonstrates that the rarely studied effect of modifications of the position of second coordination sphere chemical groups on the dynamic magnetic properties can in fact be used to chemically tune the magnetisation dynamics of 4f spin systems.展开更多
Developing lanthanide(III)ion(Ln^(3+))coordination complexes to mimic sunlight and achieve dynamic anticounterfeiting is cutting-edge research,but it remains a significant challenge for luminescence color tuning and a...Developing lanthanide(III)ion(Ln^(3+))coordination complexes to mimic sunlight and achieve dynamic anticounterfeiting is cutting-edge research,but it remains a significant challenge for luminescence color tuning and advanced information handling.Herein,a precisely designed ligand(TL)displays controllable monomers and excimers in different environments,resulting in the colorimetric properties of Ln^(3+)complexes(TL-Eu/Tb).When the sensitizer resides in the dimeric state,only TL-Eu gives strong luminescence,including outstanding WLE.Instead,in the monomeric state,TL-Eu/Tb emits red/green luminescence,and Eu^(3+)/Tb^(3+)co-doped films demonstrate tunable luminescence properties and satisfactory WLE(CIE coordinates of(0.33,0.33))can be obtained from a customized film with a 1:9(Eu^(3+)/Tb^(3+))molar ratio.Interestingly,the resulting WLE materials could be utilized in the preparation of white light-emittingdiodes(WLEDs)with superior color quality and have shown potential for advanced anti-counterfeiting applications due to their multi-stimuli responsiveness.This work provides a promising strategy for fabricating smart materials that utilize the controllable aggregation of sensitized ligands.展开更多
In this report,we have successfully prepared the hexammine cobalt(Ⅲ)coordination complex[Co(NH_(3))_(6)]^(3+)grafted onto a reduced graphene oxide(RGO)composite modified glassy carbon electrode(GCE)for the electroche...In this report,we have successfully prepared the hexammine cobalt(Ⅲ)coordination complex[Co(NH_(3))_(6)]^(3+)grafted onto a reduced graphene oxide(RGO)composite modified glassy carbon electrode(GCE)for the electrochemical determination of morin(MR).The RGO/[Co(NH_(3))_(6)]^(3+)composite was prepared by a simple sonochemical technique.The as-prepared inorganic complex was characterized using suitable physical and chemical characterization techniques.The as-prepared composite was characterized by scanning electron microscopy,elemental mapping analysis and X-ray diffraction studies.In addition,the electrochemical performance of the fabricated electrode was assessed by the cyclic voltammetry,differential pulse voltammetry and electrochemical impedance spectroscopy studies.Besides,the RGO/[Co(NH_(3))_(6)]^(3+)modified electrode had notable electrocatalytic activity towards the detection of MR.Under the optimized condition,the modified electrode showed excellent linearity ranges,acceptable limit of detection,and high sensitivity of 0.008-72.35μM,1.0 nM and 4.326μAμM^(-1)cm^(-2),respectively.The fabricated electrode exhibited acceptable repeatability,reproducibility and stability.On the other hand,the proposed RGO/[Co(NH_(3))_(6)]^(3+)modified electrodes have been applied for the detection of MR in fruit samples,and the results reveal adequate recovery.展开更多
Two new coordination complexes[Mn(L)_(2)(DNSA)](1) and[Co(L)(1,4-bdc)]_n (2) have been achieved under hydrothermal conditions (H_(2)DNSA=3,5-dinitro-salicylic acid,1,4-bdc=1,4-benzenedicarboxylic acid and L=2-(2-fluor...Two new coordination complexes[Mn(L)_(2)(DNSA)](1) and[Co(L)(1,4-bdc)]_n (2) have been achieved under hydrothermal conditions (H_(2)DNSA=3,5-dinitro-salicylic acid,1,4-bdc=1,4-benzenedicarboxylic acid and L=2-(2-fluoro-6-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline).1 crystallizes in monoclinic,space group P2_1/c with a=15.871(3),b=17.274(4),c=16.078(3)A,β=113.03(3)^(o),V=4056.6(16)A^(3),Z=4,C_(45)H_(22)Cl_(2)F_(2)Mn N_(10)O_(7),M_(r)=978.57,D_(c)=1.602 g/cm^(3),F(000)=1980,μ(Mo Ka)=0.536 mm^(–1),R=0.0437 and w R=0.1065.2 belongs to the monoclinic system,space group C2/c with a=14.665(2),b=30.856(4),c=11.237(2)A,β=111.166(2)^(o),V=4742.0(12)A^(3),Z=8,C_(27)H_(14)Cl Co FN_(4)O_(4),M_r=517.80,D_(c)=1.602 g/cm^(3),F(000)=2312,μ(Mo Ka)=0.889 mm^(–1),R=0.0364 and w R=0.0862.The central Mn(II) ion in 1 is six-coordinated by four nitrogen atoms from two L ligands and two oxygen atoms from one DNSA anion.In 2,the two kinds of 1,4-bdc ligands link neighboring Co(II) atoms to yield a two-dimensional layer structure.The luminescence of 1 has been studied in detail.Moreover,thermal behaviors of 1 and 2 are also investigated.展开更多
Two new coordination complexes[Cd(L)2(1,2,3-HBTC)]·3H2O(1)and{[Zn(L)(1,2-BDC)]-H2O}n(2)were synthesized under hydrothermal conditions(1,2,3-H3 BTC=1,2,3-tricarboxybenzene,1,2-H2 BDC=1,2-dicarboxybenzene and L=2,2...Two new coordination complexes[Cd(L)2(1,2,3-HBTC)]·3H2O(1)and{[Zn(L)(1,2-BDC)]-H2O}n(2)were synthesized under hydrothermal conditions(1,2,3-H3 BTC=1,2,3-tricarboxybenzene,1,2-H2 BDC=1,2-dicarboxybenzene and L=2,2’-H2 biimidazole).1 crystallizes in monoclinic,space group P21/c with a=12.256(5),b=11.620(5),c=17.479(5)A,β=95.548(5)°,V=2477.6(16)A^3,Z=4,C21H22N8 O9 Cd,Mr=642.86,Dc=1.724 g/cm^3,F(000)=1296,μ(MoKa)=0.950 mm^-1,R=0.0546 and wR=0.1724.2 belongs to the monoclinic system,space group P21/c with a=7.408(4),b=20.743(10),c=10.194(5)A,β=95.648(6)°,V=1477.3(12)A^3,Z=4,C14H12N4 O5 Zn,Mr=381.65,Dc=1.716 g/cm3,F(000)=776,μ(MoKa)=1.698 mm^-1,R=0.0574 and wR=0.1632.The central Cd(Ⅱ)ion in 1 is coordinated with five atoms,forming a slightly distorted square-pyramidal geometry.The central Zn(Ⅱ)ion in 2 is four-coordinated by two nitrogen atoms from one L ligand and two oxygen atoms from two different 1,2-BDC anions.In addition,luminescent property of 1 has been investigated,and natural bond orbital(NBO)analysis of 2 has been calculated by the B3LYP/LANL2DZ method.展开更多
Redox flow batteries(RFBs)that employ sustainable,abundant,and structure-tunable redox-active species are of great interest for large-scale energy storage.As a vital class of redox-active species,metal coordination co...Redox flow batteries(RFBs)that employ sustainable,abundant,and structure-tunable redox-active species are of great interest for large-scale energy storage.As a vital class of redox-active species,metal coordination complexes(MCCs)possessing the properties of both the organic ligands and transition metal ion centers are attracting increasing attention due to the advantages of multielectron charge transfer,high structural tailorability,and reduced material crossover.Herein,we present a critical overview of RFBs that employ MCCs as redox-active materials in both aqueous and nonaqueous mediums.The progress is comprehensively summarized,including the design strategies,solubility characteristics,electrochemical properties,and battery cycling performance of MCCs.Emphasis is placed on the ligand selection and modification strategies used to tune the critical properties of MCCs,including their redox potential,solubility,cycling stability,and electron transfer redox reactions,to achieve stable cycled RFBs with a high energy density.Furthermore,we discuss the current challenges and perspectives related to the development of MCC-based RFBs for large-scale energy storage implementations.展开更多
A Cu(II)coordination complex(1)with Schiff ligand derived from diaminomaleonitrile was synthesized and characterized,in which the ligand is rigid,planar and conjugated.The complex 1 displays an interesting fluorescent...A Cu(II)coordination complex(1)with Schiff ligand derived from diaminomaleonitrile was synthesized and characterized,in which the ligand is rigid,planar and conjugated.The complex 1 displays an interesting fluorescent property relative to solvents which can be turned-on by CH_(2)Cl_(2) and CHCl_(3) solvent molecules.The mechanism of this selective fluorescence emission has been studied based on the crystal structure and the spectrum analysis.The tuning on and off fluorescence of complex 1 can be controlled by the process of supramolecular aggregation/deag-gregation in different solvents.展开更多
The complexity of communication and coordination stemming from teams responsible for adjusting interdependent parameters of components is a fundamental feature in the aircraft engine remanufacturing engineering projec...The complexity of communication and coordination stemming from teams responsible for adjusting interdependent parameters of components is a fundamental feature in the aircraft engine remanufacturing engineering project. To manage coordination complexity, the features of the remanufacturing process of aircraft engine are analyzed and a systematic method is presented to measure and optimize the dependency between coupled components.Furthermore, quantitative models are built based on Design Structure Matrix(DSM) models to measure dependency strengths related to the parameter features of the components. Also, a two-stage DSM clustering criteria is used to reduce the complexity of an organization. An industrial example is provided to illustrate the proposed models. The results showed that the proposed approach can reduce total coordination complexity.展开更多
基金supported by grant No.98U587 from Abadan University of Medical Sciences。
文摘Narrow solar-light response range and rapid charges recombination are the main technical barriers in TiO_(2) photocatalysis technology.To overcome these restrictions,in this work we synthesized a novel binuclear gadolinium(Ⅲ) coordination complex,[Gd_(2)(DPDB)_6(DMF)_6(H_(2)O_()2)](DPDB=[(4-dimethylamino)phenyldiazenyl] benzenesulfonate),which was used as an inorganic sensitizer for boosting the visible light-harvesting and quantum efficiency of TiO_(2) supported-reduced graphene oxide(rGO) nanocomposite.Crystal structure of [Gd_(2)(DPDB)_6(DMF)_6(H_(2)O)_(2)](Gd-CMP) was determined from single-crystal X-ray diffraction data,which indicates three-dimensional(3D) supramolecular architecture through hydrogen bonding and CH…π_(ph) interactions.The prepared nanohybrid(Gd-CMP/TG) reveals significantly enhanced visible-light-induced photocatalytic activity for degradation of acetaminophen(ACT).The complete removal of 10 mg/L ACT is achieved over Gd-CMP/TG,and the corresponding rate constant of ACT degradation of nanohybrid is 40-fold higher than that of bare TiO_(2).In prepared ternary nanohybrid,metal-coordination sensitizer(Gd-CMP) acts as an electron donor,and at the same time,rGO serves as an electron acceptor,and the synergistic effect between them efficiently enhances charges separation and inhibits e/h pair recombination in the hybridized species.The radical scavenger tests indicate that the photo-induced O_(2)^(-·) radicals dominate ACT degradation.On the basis of the experimental results and calculated energy of electronic levels,a possible mechanism for the improved photocatalytic activity is discussed.
基金the National Natural Science Foundation of China(U1910202,21978194 and 21603256)the Natural Science Foundation of Shanxi Province(201801D121055)Program for the Shanxi Young Sanjin Scholar.
文摘With the development of coal chemical industry,large amounts of naphthalene and n-butene are produced,and converting them into high value-added products through alkylation has gained particular importance and interest.In this work,liquid coordination complexes(LCCs)were used as acid catalysts for the first time in the naphthalene alkylation reaction under mild conditions to obtain multibutylnaphthalenes with high yield.Various reaction conditions were thoroughly investigated.The LCC consisting of urea and AlCl_(3) showed excellent catalytic performance under optimal reaction conditions,giving 100%conversion of naphthalene and 99.66%selectivity towards multi-butylnaphthalenes.Combining the catalyst properties and catalytic results,a plausible reaction mechanism was proposed.The lubricating properties of the synthesized products were investigated for their potential application as lubricating base oils.The synthesized multi-butylnaphthalenes showed comparable physicochemical properties and tribological performances as the commercial cycloalkyl base oil.
基金the support of National Science Foundations of China(No.21461001)the Project of Jiangxi Provincial Department of Education(Nos.GJJ170436 and GJJ180367)+1 种基金the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.19JKB150007)the Doctoral Scientific Research Foundation of East China University of Technology(No.DHBK2019143)。
文摘Two new hydrostable two-dimensional(2 D)uranyl coordination complexes[(UO_(2))_(5)(μ_(3)-O)_(2)(nbca)_(2)].7 H_(2)O(1)and[(UO_(2))_(3)(nbca)_(2)(H_(2)O)_(3)]·2 H_(2)O(2)(H_(3)nbca=5-nitro-1,2,3-benzenetricarboxylic acid)were hydrothermal synthesized.Single-crystal structural refinements reveal that both of the two complexes were formed by the packing of 2D uranyl coordination sheets via the hydrogen bonds.The nbca ligand coordinating to the uranyl polyhedron centers constructed the 2D sheets.There are UO8 hexagonal bipyramids and UO7 pentagonal bipyramids in 1 while only U07 pentagonal bipyramids in 2.Photocatalytic degradation of rhodamine B(RhB)in aqueous solution was studied.Complex 2 possesses better performance than 1 with 96.2%of the RhB was degraded in only 60 min.Mechanism studies reveal that the dissolved oxygens are essential to the RhB degradation.The photocurrent density of 2 is more stable than that of 1,which indicating the stronger ability to separate photoexcited electrons and hole pairs of 2.
基金Project supported by the Nonprofit Technology&Research in Zhejiang(2011C37010)sponsored by the K.C.Wong Magna Fund in Ningbo University,the Ningbo Municipal Natural Science Foundation(2010A610160)the Subject Object(xk1070)and Foundation(20111045)of Ningbo University
文摘Two 1D coordination polymers[Ln2(dpdc)3(tpy)2·H2O]n[Ln=Nd 1,Yb 2,H2dpdc=2,2'-biphenyldicarboxylic acid and tpy=2,2':6',2''-terpyridine]and one dinuclear complex Er2(dpdc)2(Hdpdc)2(tpy)23 were obtained via hydrothermal reactions and determined by X-ray diffraction analysis.The crystal structure data of 1 and 2 revealed that two coordination polymers were isostructural and possessed a 1D chain framework consisting of eight-coordinated Ln(III)centers.In the asymmetric unit,the two Er(III)ions in 3 were both nine-coordinated and had similar coordination environments.The Er(III)ions were bridged by dpdc2-ligands into dinuclear structures.The complexes were also characterized by IR spectra and thermogravimetric analysis.The solid fluorescence of 1 and 3 was also investigated at room temperature.
基金the Hunan Provincial Educational Ministry Foundation of China(00C001)
文摘Two coordinate reactions,NdCl 3·6H 2O(s)+3CCl 3COOH(s)(or TCA)=Nd(TCA)3·3H 2O(s)+3HCl(g)+3H 2O(l)and Nd(TCA)3·3H 2O(s)+2C 9H 7NO(s)=Nd(TCA)(C 9H 6NO)2(s)+2CCl 3COOH(s)+3H 2O(l),were studied by the classical solution calorimetry at 298.15K.The molar dissolution enthalpies of the reactants and the products in certain solvent(the first reaction in 1 mol·L-1 HCl,the second in a mixed solution consisting of absolute ethyl alcohol,dimethyl sulfoxide and 4 mol·L-1 HCl)were measured by using an isoperibol calorimeter at 298.15K.From the results and other auxiliary quantities,the standard molar formation enthalpies of[Nd(TCA)3·3H 2O,s,298.15K]and[Nd(TCA)(C 9H 6NO)2,s,298.15K]are determined asΔfH m°[Nd(TCA)3·3H 2O,s,298.15K]=-3053.3 kJ·mol-1 andΔfH m°[Nd(TCA)(C 9H 6NO)2,s,298.15K]=-1355.6 kJ·mol-1.
基金Supported by the National Natural Science Foundation of China(No.21301069)the Natural Science Foundation of Shandong Province(No.ZR2012BQ004)
文摘A new coordination complex [Cd(pda)(pyz)(H2O)2]n(1, H2 pda = 1,4-phenylenediacetic acid, pyz = pyrazine) have been synthesized and structurally characterized. Crystal data for the title complex are as follows: orthorhombic system, space group Ccmb with a = 11.5245(3) b = 19.5069(5) c = 11.4231(3) A, V = 2568.00(12) A3, Mr = 188.31, Z = 16, F(000) = 1480, Dc = 1.948 g/cm3, μ(Mo Kα) = 1.725 mm-1, R = 0.0195 and w R = 0.0462 for 1357 observed reflections with I 】 2σ(I). In the title complex, the central Cd(II) ion is located in a distorted octahedral coordination environment. Two Cd(II) ions are bridged by two pda2- ligands and one pyz ligand to form a bi-loop structure. Luminescent property of the complex has also been studied.
基金supported by the National Natural Science Foundation of China (22275131)the Institutional Research Fund from Sichuan University (2021SCUNL201)+1 种基金the 111 Project (B20001)the Fundamental Research Funds for the Central Universities。
文摘With the increase of people’s demand,it is extremely desired for developing high-safety,widetemperature-range and high-energy-density lithium batteries,but huge challenges are remained due to shrinkage and combustion of commonly used polyolefin separators at high temperatures,as well as narrow usable temperature range and high flammability of conventionally commercialized liquid electrolytes.In this work,we report a multifunctional separator mainly consisting of Zn^(2+)-phytate coordination complex nanoparticles and bacterial cellulose nanofibers,named the BZP separator,which possesses high porosity,excellent thermotolerance,good flame retardancy,abilities of anion binding and Ni^(2+)capturing.Through cooperating with the fluoride-free wide-temperature-range electrolyte,Li//LiFePO_(4) cells not only deliver discharge capacities of 110.39 mA h g^(-1)and 113.25 mA h g^(-1)after 2200 cycles (2 C) and1600 cycles (5 C) at 25℃,with capacity retentions of 76.59%and 86.09%,respectively,but also exhibit excellent cycling performance at 80℃ and-40℃.Significantly,the Li//NCM811 cell with a loading of7.8 mg cm^(-2)delivers a discharge capacity of 146.64 mA h g^(-1)after 200 cycles at 0.5 C,with a capacity retention of 89.03%.In addition,pouch cells can work at 120℃ and have low flammability.
基金Project supported by the National Natural Science Foundation of China (Grant No 10774103)the Doctoral Education Fund of the Education Ministry of China (Grant No 20050610011)
文摘By simulating the electron paramagnetic resonance （EPR） and optical spectra on the basis of the 120 × 120 complete energy matrix, this paper determines the local lattice structure parameters R1 and R2 for MCl：V2＋ （M=Na, K, Rb） systems at 77K, 195 K and RT （room temperature 295 K or 302 K）, respectively. The theoretical results indicate that there exists a compressed distortion in MCl：V2＋ systems. Meanwhile, it finds that the structure parameters R1, R2 and ｜△R｜（ = R1 - R2） increase with the rising temperature. Subsequently, from the analysis it concludes that the relation of EPR parameter D vs. △R is approximately linear. Finally, the effects of orbital reduction factor k on the g factors for the three systems have been discussed.
基金Supported by the Natural Science Foundation of Anhui Province (090416239)the Science and Technology Play (?) Projects of Anhui Province (09020203071)+2 种基金the National Natural Science Foundation of China (20871089)the Foundation of Anhui Provincial Education Department for Outstanding Young Talents in University (2009SQRZ172)the Scientific Research Foundation for the Professors (Doctors) of Suzhou University (2010jb01)
文摘Two new transition metal compounds, [Mn（dpa）2（tmd）2]n （1, H2dpa = 4-hydroxy-phenyl-acetic acid, tmd = 4,4-trimethylenedipyridine） and [Co4（dpa）6（tmd）4（H2O）4]n·nH2O·nCl2 （2）, have been synthesized by hydrothermal synthesis. Compound 1 crystallizes in the monoclinic system, space group P21/n with a = 9.828（3）, b = 17.493（5）, c = 11.616（4）, β = 110.146（6）o, V = 1874.9（10）3, C42H42MnN4O6, Mr = 753.74, Z = 2, Dc = 1.335 g/cm3, μ = 0.406 mm-1, F（000） = 790, the final R = 0.1047 and wR = 0.2021 for 2698 observed reflections （I 〉 2σ（I））. Compound 2 crystallizes in the monoclinic system, space group P21/c with a = 11.7214（13）, b = 17.1582（19）, c = 24.625（3）, β = 103.055（3）o, V = 4824.4（9）3, C100H104Cl2Co4N8O23, Mr = 2094.55, Z = 2, Dc = 1.443 g/cm3, μ = 0.809 mm-1, F（000） = 2180, the final R = 0.0550 and wR = 0.0673 for 4104 observed reflections （I 〉 2σ（I））. These complexes were characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. The structural analyses show that the two compounds are both one-dimensional chain structures. However, compounds 1 and 2 form threedimensional supramolecular structures by hydrogen bonds, respectively.
基金Supported by the Key projects of Hubei Provincial Education Department(D20171902)
文摘Two new cobalt（II） coordination complexes, namely [Co（HL）2（biim）（H2O）2]n·n H2O（1） and [Co（Et L）2（biim）]n·3 n（H2O）·2 n（Et HL）（2）（H2L =（fluorene-9,9-diyl）dipropanoic acid, biim = 1,3-bis（imidazol-1-yl）butane）, have been synthesized using the same starting reactants but different solvent medium. The two complexes exhibit distinctly different structures. Compound 1 exhibits a one-dimensional linear chain structure. However, complex 2 reveals a one-dimensional zigzag chain structure. Thermogravimetric analyses（TGA） and luminescent properties of these two complexes have been discussed.
基金Supported by the National Natural Science Foundation of China (No.20671064)Doctor Foundation of Liaoning Province (No.20071016)
文摘The 1-D chain coordination complex of {[Mn2（HCAM）3（H2bipy）]·5H2O}n （H3CAM = 4-hydroxypyridine-2,6-dicarboxylic acid, bipy = 4,4＇-bipyridine） has been synthesized by the reaction of 4-hydroxypyridine-2,6-dicarboxylic acid, 4,4＇-bipyridine and manganese carbonate under hydrothermal conditions, and its crystal structure was determined by X-ray diffraction method The crystal belongs to the monoclinic system, space group P21/n with a = 10.110（2）, b = 20.159（4）, c = 17.861（4）A,β = 99.67（3）°, V = 3.5884（12） nm3, Mr= 901.47, Z = 4, Dc= 1.669 g.cm^-3, μ= 0.798 mm^-1, F（000） = 1840, the final R = 0.0713 and ωR = 0.1853. The complex forms a 1-D chain bridged by HCAM, protonated 4,4-bipyridines link the 1-D chains to construct 2-D networks via N-H...O hydrogen bonds, and networks are further extended via π-π stacking and hydrogen bonds into 3-D supramolecular framework.
基金supported by the National Natural Science Foundation of China(21373221)the Natural Science Foundation of Fujian Province(2006L2005 and 2014H0007)
文摘A novel coordination complex,{[Cd）2（C（20）H（10）O5）2（H2O）4]·10H2O}n,has been synthesized based on fluorescein（2-（6-hydroxy-3-oxo-3 H-xanthen-9-yl） benzoic acid） and systematically characterized by elemental analysis,infrared（IR） spectrum,thermo gravimetric analysis（TGA）,powder X-ray diffraction（PXRD） and single-crystal X-ray diffraction.Compound 1 crystallizes in monoclinic,space group P2/n with a = 20.428（5）,b = 8.084（2）,c = 21.689（5）A,β = 96.360（5）°,Mr = 993.46,V = 3559.7（15）A^3,Z = 4,Dx = 1.845 g/cm^3,μ = 1.276 mm^-1,F（000） = 1974,GOOF = 1.044,λ（Mo Kα） = 0.71073 ？,the final R = 0.0553 and wR = 0.1720 for 7245 observed reflections with I 〉 2σ（I）.
基金Novo Nordisk Foundation for research grant NNF20OC0065610 under the Natural and Technical Sciences programme.
文摘The eigenspectrum and eigenvectors of the ^(2)F_(7/2) ground multiplets of two structural isomer coordination complexes,Yb(trenovan)(H_(3)trenovan=tris(((3-methoxysalicylidene)amino)ethyl)amine)and Yb(trenpvan)(H_(3)trenpvan=tris(((5-methoxysalicylidene)amino)ethyl)amine),were determined by use of magnetometry,electron paramagnetic resonance and luminescence spectroscopies.The two 4f complexes crystallise in the trigonal P3space group,have identical chemical formulas and differ only in the placement of the methoxy group on the aromatic ring of salicylaldehyde,with it being either ortho,Yb(trenovan),or para,Yb(trenpvan),to the phenoxo group.This structural isomerism is found to have a profound influence on the solid state static and dynamic magnetic properties of the complexes.In the bulk,both isomers display a combination of direct and Raman magnetisation relaxation proccesses,however,at vastly different rates.Magnetic dilution in an isostructural diamagnetic host supresses the occurrence of the direct process suggesting that the direct process observed in the bulk originates from Yb_((III))centres coupled by magnetic dipole interactions.The eigenspectrum,eigenvectors and spin lattice relaxation of Yb(trenpvan)are found to be closer to the ones found in Yb(trensal)(H_(3)trensal=tris(((salicylidene)amino)ethyl)amine)where the methoxy group is substituted by an H atom,than to those of Yb(trenovan)where the methoxy group is in the ortho position.Thus,the position of chemical modifications has a tremendous influence on the static and dynamic solid state magnetic properties of 4f coordination complexes.Our detailed study on single crystals,demonstrates that the rarely studied effect of modifications of the position of second coordination sphere chemical groups on the dynamic magnetic properties can in fact be used to chemically tune the magnetisation dynamics of 4f spin systems.
基金supported by the National Natural Science Foundation of China(Grant No.22161012)the Science and Technology Program of Guizhou Province(Grant No.Qiankehejichu-ZK[2021]General 066)the Academic New Seedling Foundation Project of Guizhou Normal University(Grant No.Qianshixinmiao-[2022]07).
文摘Developing lanthanide(III)ion(Ln^(3+))coordination complexes to mimic sunlight and achieve dynamic anticounterfeiting is cutting-edge research,but it remains a significant challenge for luminescence color tuning and advanced information handling.Herein,a precisely designed ligand(TL)displays controllable monomers and excimers in different environments,resulting in the colorimetric properties of Ln^(3+)complexes(TL-Eu/Tb).When the sensitizer resides in the dimeric state,only TL-Eu gives strong luminescence,including outstanding WLE.Instead,in the monomeric state,TL-Eu/Tb emits red/green luminescence,and Eu^(3+)/Tb^(3+)co-doped films demonstrate tunable luminescence properties and satisfactory WLE(CIE coordinates of(0.33,0.33))can be obtained from a customized film with a 1:9(Eu^(3+)/Tb^(3+))molar ratio.Interestingly,the resulting WLE materials could be utilized in the preparation of white light-emittingdiodes(WLEDs)with superior color quality and have shown potential for advanced anti-counterfeiting applications due to their multi-stimuli responsiveness.This work provides a promising strategy for fabricating smart materials that utilize the controllable aggregation of sensitized ligands.
文摘In this report,we have successfully prepared the hexammine cobalt(Ⅲ)coordination complex[Co(NH_(3))_(6)]^(3+)grafted onto a reduced graphene oxide(RGO)composite modified glassy carbon electrode(GCE)for the electrochemical determination of morin(MR).The RGO/[Co(NH_(3))_(6)]^(3+)composite was prepared by a simple sonochemical technique.The as-prepared inorganic complex was characterized using suitable physical and chemical characterization techniques.The as-prepared composite was characterized by scanning electron microscopy,elemental mapping analysis and X-ray diffraction studies.In addition,the electrochemical performance of the fabricated electrode was assessed by the cyclic voltammetry,differential pulse voltammetry and electrochemical impedance spectroscopy studies.Besides,the RGO/[Co(NH_(3))_(6)]^(3+)modified electrode had notable electrocatalytic activity towards the detection of MR.Under the optimized condition,the modified electrode showed excellent linearity ranges,acceptable limit of detection,and high sensitivity of 0.008-72.35μM,1.0 nM and 4.326μAμM^(-1)cm^(-2),respectively.The fabricated electrode exhibited acceptable repeatability,reproducibility and stability.On the other hand,the proposed RGO/[Co(NH_(3))_(6)]^(3+)modified electrodes have been applied for the detection of MR in fruit samples,and the results reveal adequate recovery.
基金Supported by the National Natural Science Foundation of China(No.21805110)。
文摘Two new coordination complexes[Mn(L)_(2)(DNSA)](1) and[Co(L)(1,4-bdc)]_n (2) have been achieved under hydrothermal conditions (H_(2)DNSA=3,5-dinitro-salicylic acid,1,4-bdc=1,4-benzenedicarboxylic acid and L=2-(2-fluoro-6-fluorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline).1 crystallizes in monoclinic,space group P2_1/c with a=15.871(3),b=17.274(4),c=16.078(3)A,β=113.03(3)^(o),V=4056.6(16)A^(3),Z=4,C_(45)H_(22)Cl_(2)F_(2)Mn N_(10)O_(7),M_(r)=978.57,D_(c)=1.602 g/cm^(3),F(000)=1980,μ(Mo Ka)=0.536 mm^(–1),R=0.0437 and w R=0.1065.2 belongs to the monoclinic system,space group C2/c with a=14.665(2),b=30.856(4),c=11.237(2)A,β=111.166(2)^(o),V=4742.0(12)A^(3),Z=8,C_(27)H_(14)Cl Co FN_(4)O_(4),M_r=517.80,D_(c)=1.602 g/cm^(3),F(000)=2312,μ(Mo Ka)=0.889 mm^(–1),R=0.0364 and w R=0.0862.The central Mn(II) ion in 1 is six-coordinated by four nitrogen atoms from two L ligands and two oxygen atoms from one DNSA anion.In 2,the two kinds of 1,4-bdc ligands link neighboring Co(II) atoms to yield a two-dimensional layer structure.The luminescence of 1 has been studied in detail.Moreover,thermal behaviors of 1 and 2 are also investigated.
基金Supported by the National Natural Science Foundation of China(No.21607051)。
文摘Two new coordination complexes[Cd(L)2(1,2,3-HBTC)]·3H2O(1)and{[Zn(L)(1,2-BDC)]-H2O}n(2)were synthesized under hydrothermal conditions(1,2,3-H3 BTC=1,2,3-tricarboxybenzene,1,2-H2 BDC=1,2-dicarboxybenzene and L=2,2’-H2 biimidazole).1 crystallizes in monoclinic,space group P21/c with a=12.256(5),b=11.620(5),c=17.479(5)A,β=95.548(5)°,V=2477.6(16)A^3,Z=4,C21H22N8 O9 Cd,Mr=642.86,Dc=1.724 g/cm^3,F(000)=1296,μ(MoKa)=0.950 mm^-1,R=0.0546 and wR=0.1724.2 belongs to the monoclinic system,space group P21/c with a=7.408(4),b=20.743(10),c=10.194(5)A,β=95.648(6)°,V=1477.3(12)A^3,Z=4,C14H12N4 O5 Zn,Mr=381.65,Dc=1.716 g/cm3,F(000)=776,μ(MoKa)=1.698 mm^-1,R=0.0574 and wR=0.1632.The central Cd(Ⅱ)ion in 1 is coordinated with five atoms,forming a slightly distorted square-pyramidal geometry.The central Zn(Ⅱ)ion in 2 is four-coordinated by two nitrogen atoms from one L ligand and two oxygen atoms from two different 1,2-BDC anions.In addition,luminescent property of 1 has been investigated,and natural bond orbital(NBO)analysis of 2 has been calculated by the B3LYP/LANL2DZ method.
基金supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region,China(Project No.T23-601/17-R).
文摘Redox flow batteries(RFBs)that employ sustainable,abundant,and structure-tunable redox-active species are of great interest for large-scale energy storage.As a vital class of redox-active species,metal coordination complexes(MCCs)possessing the properties of both the organic ligands and transition metal ion centers are attracting increasing attention due to the advantages of multielectron charge transfer,high structural tailorability,and reduced material crossover.Herein,we present a critical overview of RFBs that employ MCCs as redox-active materials in both aqueous and nonaqueous mediums.The progress is comprehensively summarized,including the design strategies,solubility characteristics,electrochemical properties,and battery cycling performance of MCCs.Emphasis is placed on the ligand selection and modification strategies used to tune the critical properties of MCCs,including their redox potential,solubility,cycling stability,and electron transfer redox reactions,to achieve stable cycled RFBs with a high energy density.Furthermore,we discuss the current challenges and perspectives related to the development of MCC-based RFBs for large-scale energy storage implementations.
基金the National Science Council of the People’s Republic of China for supporting this research(Nos.21071018,21271026).
文摘A Cu(II)coordination complex(1)with Schiff ligand derived from diaminomaleonitrile was synthesized and characterized,in which the ligand is rigid,planar and conjugated.The complex 1 displays an interesting fluorescent property relative to solvents which can be turned-on by CH_(2)Cl_(2) and CHCl_(3) solvent molecules.The mechanism of this selective fluorescence emission has been studied based on the crystal structure and the spectrum analysis.The tuning on and off fluorescence of complex 1 can be controlled by the process of supramolecular aggregation/deag-gregation in different solvents.
基金supported by the National Natural Science Foundation of China (No.71472013 No.71528005)
文摘The complexity of communication and coordination stemming from teams responsible for adjusting interdependent parameters of components is a fundamental feature in the aircraft engine remanufacturing engineering project. To manage coordination complexity, the features of the remanufacturing process of aircraft engine are analyzed and a systematic method is presented to measure and optimize the dependency between coupled components.Furthermore, quantitative models are built based on Design Structure Matrix(DSM) models to measure dependency strengths related to the parameter features of the components. Also, a two-stage DSM clustering criteria is used to reduce the complexity of an organization. An industrial example is provided to illustrate the proposed models. The results showed that the proposed approach can reduce total coordination complexity.
