A metal-organic coordination polymer [Cd（tdc）（bimb）（μ2-H2O）]n （H2tdc = thiophe-ne-2,5-dicarboxylic acid, bimb = 1,4-bis（imidazol-l-yl）-butane） 1 has been hydrothermally synthe- sized and characterized by el...A metal-organic coordination polymer [Cd（tdc）（bimb）（μ2-H2O）]n （H2tdc = thiophe-ne-2,5-dicarboxylic acid, bimb = 1,4-bis（imidazol-l-yl）-butane） 1 has been hydrothermally synthe- sized and characterized by elemental analysis, IR, TG, luminescence spectrum and single-crystal X-ray diffraction. Colorless crystals crystallize in the triclinic system, space group P^-1 with a = 5.8945（3）, b = 10.3129（5）, c = 11.2226（5） A, a = 95.1430（10）,β = 97.9020（10）, γ = 90.5910（10）°, V = 672.84（6） A^3, C11H11CdN2O5S, Mr= 395.68, De = 1.953 g/cm^3, μ（MoKa） = 1.797 mm^-1, F（000） = 390, Z = 2, the final R = 0.0209 and wR = 0.0508 for 2514 observed reflections （I 〉 2σ（I））. The structure of 1 exhibits a two-dimensional layer-like structure.展开更多
A novel two-dimensional coordination polymer [Ba2（phen）4（tp）2]n （phen = 1,10- phenanthroline, tp = terephthalic acid） has been synthesized with tp as bridge ligands and structurally determined by X-ray crystallo...A novel two-dimensional coordination polymer [Ba2（phen）4（tp）2]n （phen = 1,10- phenanthroline, tp = terephthalic acid） has been synthesized with tp as bridge ligands and structurally determined by X-ray crystallography. The crystal belongs to the monoclinic system, space group C2/c, with a = 18.877（4）, b = 18.489（4）, c = 15.658（3） A, β = 103.61（3）°, V= 5311.5（19）A^3, C32H20O4N4Ba, Mr = 661.86, Z= 8, F（000） = 2624,μ= 1.542 mm^-1, Dc= 1.655 g/cm^3, the final R = 0.0228 and wR = 0.0554 for 6063 observed reflections （I 〉 2σ（I））. The structural analysis shows that each tp ligand bridges barium atoms to form a two-dimensional infinite layer. There are aromatic π-π stacking interactions between neighboring layers, and aromatic π-π interactions further extend such layers into a three-dimensional supramolecular framework.展开更多
A 2D lamellar metal-organic coordination polymer [2-（1,3）-dithian-2-ylidene malonate] diaquoicadmium（Ⅱ） hydrate, [Cd（dym）（H2O）2（H2O）], （dym = 2-（1,3）-dithian-2-ylidene malonate）, has been prepared by co...A 2D lamellar metal-organic coordination polymer [2-（1,3）-dithian-2-ylidene malonate] diaquoicadmium（Ⅱ） hydrate, [Cd（dym）（H2O）2（H2O）], （dym = 2-（1,3）-dithian-2-ylidene malonate）, has been prepared by conventional solution reaction. The structure analysis suggests that the polymer crystallized in orthorhombic system with space group Pbca and the final R indices （I 〉2σ（I））： R1 = 0.0236 and wR2= 0.0738. Crystal data： a = 12.6138（5）, b = 8.4528（3）, c = 22.5867（8） A°, V = 2409.8（15）A°^3, Z = 3, F（000） = 1520, Dc = 1.482 g/cm^3,μ（MoKα） = 0.990 mm^-1 and Mr= 384.69 g/mol. The Cd（Ⅱ） ion is in a disordered triangle prism environment. The Cd-O distances are in the range of 2.2643（14）-2.3641（15）A°. In the crystal, the Cd atoms are arranged at the comers of honeycomb-like hexagonal 24-membered macrometallacycle. There is a weak C-H...S interaction between the 1,3-dithiocyclohexyl groups of two adjacent dym ligands.展开更多
A new two-dimensional （2D） manganese（II） coordination polymer {[Mn（bidc）（H2O）2]· 2H2O}n （H2bidc = benzimidazole-5,6-dicarboxylic acid） was synthesized, and characterized by X-ray crystallography and oth...A new two-dimensional （2D） manganese（II） coordination polymer {[Mn（bidc）（H2O）2]· 2H2O}n （H2bidc = benzimidazole-5,6-dicarboxylic acid） was synthesized, and characterized by X-ray crystallography and other measurements. The complex crystallizes in the orthorhombic system, space group Pbca with a = 7.0218（7）, b = 17.9701（18）, c = 19.0697（19）, V = 2406.3（4）3, Z = 8, Dc = 1.823 g/cm3, Mr = 330.14, F（000） = 1344, μ（MoKα） = 1.140 mm-1, S = 1.055, R = 0.0305 and wR = 0.1012 for 2130 observed reflections （I 2σ（I））. The title complex consists of a novel 2D network with a topology of short symbol （4.82）（4.82）.展开更多
A reliable and sensitive strategy which can assess nucleic acid levels in living cells would be essential for fundamental research of biomedical applications. Some nanomaterial-based fluorescence biosensors recently d...A reliable and sensitive strategy which can assess nucleic acid levels in living cells would be essential for fundamental research of biomedical applications. Some nanomaterial-based fluorescence biosensors recently developed for detecting nucleic acids, however, are often with expensive, complicated and timeconsuming preparation process. Here, by using a facile bottom-up synthesis method, a two-dimensional(2 D) coordination polymer(CP) nanosheet, [Cu(tz)](Htz = 1,2,4-triazole), was successfully prepared after optimizing reaction conditions. These ultrathin CP nanosheets with thickness of 4.7 ± 1.1 nm could readily form nanosensors by assembly with DNA probes, which exhibited a low limit of detection(LOD)for p53 DNA fragment as 144 pmol/L. Furthermore, by integrating [Cu(tz)] nanosheets with hybridization chain reaction(HCR) probes, mi R-21, one kind of micro RNA upregulated in many cancer cells, can be sensitively detected with a LOD of 100 pmol/L and monitored in living cells, giving consistent results with those obtained by quantitative reverse-transcription polymerase chain reaction(q RT-PCR) analysis.Thus [Cu(tz)] nanosheets, which not only possess much better nucleic acids sensing performance than bulk cystals, but also exhibit nucleic acid delivery functions, could be used as a novel nanoplatform in biomedical imaging and sensing applications.展开更多
A novel two-dimensional Mn（II） coordination polymer, [Mn3（L）R（cis-chdc）fftrans- chdc）]n （L = 2-amino-4-（1H-imidazo[4,5-J][1,10]phenanthrolin-2-yl）phenol and chdc = 1,4-cyclo- hexanedicarboxylate）, has been ...A novel two-dimensional Mn（II） coordination polymer, [Mn3（L）R（cis-chdc）fftrans- chdc）]n （L = 2-amino-4-（1H-imidazo[4,5-J][1,10]phenanthrolin-2-yl）phenol and chdc = 1,4-cyclo- hexanedicarboxylate）, has been hydrothermally synthesized and characterized by elemental analysis, IR, TG PL and single-crystal X-ray diffraction. Crystallographic data for this compound： monoclinic space group P2/n with a = 11.0058（13）, b = 9.0179（11）, c = 28.431（3） A, β = 92.850（2）°, V = 2818.3（6） A3, Z = 2, C62Hs6Mn3N10O14, Mr = 1329.99, Dc = 1.567 g/cm3, F（000） = 1370, p（MoKa） = 0.742 mm-1, R = 0.0553 and wR = 0.1421. The chdc carboxylates bridge the Mn（II） atoms to form a trinuclear Mn（lI） cluster. The cis-chdc ligands are held together by the trinuclear Mn（II） clusters to result in a chain structure. Further, the trans-chdc ligands link adjacent chains to furnish a two-dimensional network. The π-π interactions between neighboring layers link the adjacent layers into a three-dimensional supramolecular architecture. Moreover, the N-H...O and O-H...O hydrogen bonds further stabilize the 3D supramolecular architecture.展开更多
Acceptorless dehydrogenative coupling of pyridinemethanol with ketones is one of the most reliable methodologies to access functionalized 1,8-naphthyridine derivatives.However,it is challenging to develop environmenta...Acceptorless dehydrogenative coupling of pyridinemethanol with ketones is one of the most reliable methodologies to access functionalized 1,8-naphthyridine derivatives.However,it is challenging to develop environmentally friendly catalytic systems,especially in constructing efficient and recyclable catalysts under water or solvent-free conditions.Here,we designed two novel coordination polymers Cd-CPs and Fe-CPs to investigate their catalytic performance in water.Gratifyingly,it was observed that Cd-CPs as a multifunctional catalyst was successfully applied to establish a universal pathway for direct fabrication of 1,8-naphthyridine derivatives under water conditions,while it was effective for the synthesis of1,3,5-triazines through acceptorless dehydrogenative coupling strategies.The features of broad substrate,high atom efficiency,and good catalyst reusability highlight the feasibility of this transformation.In additional,we demonstrated the spindle-like structures Fe-P,derived from the Fe-CPs via phosphorylation,which can be used as an efficient electrocatalyst for oxygen evolution reaction with good stability.This work provides two highly efficient non-noble metal catalysts for functionalized 1,8-naphthyridine derivatives production and oxygen evolution reaction,and opens a new avenue to further fabricate diverse metal catalysts with high catalytic performance in water.展开更多
A well-designed redox-active organic linker,pyrazine-2,3,5,6-tetracarboxylate(H_4pztc)with brimming active sites for lithium ions storage was utilized to construct coordination polymers(CPs)via a facile hydrothermal r...A well-designed redox-active organic linker,pyrazine-2,3,5,6-tetracarboxylate(H_4pztc)with brimming active sites for lithium ions storage was utilized to construct coordination polymers(CPs)via a facile hydrothermal reaction.Those two isostructural two-dimensional(2D)CPs,namely[M_2(pztc)(H_2O)_6]_n(M=Co for 1 and Ni for 2),delivered excellent reversible capacities and stable cycling performance as anodes in lithium ion batteries.As demonstrated in electrochemical studies,1 and 2 can achieve highly reversible capacities of 815 and 536 mA h g^(-1)at 200 mA g^(-1)for 150 cycles,respectively,best performed for the reported2D-CP-based anode materials.The electrochemical mechanism studies showed that the remarkable performances can be ascribed to the synergistic Li-storage redox reactions of metal centers and organic moieties.Our work highlights the opportunities of using a well-designed organic ligand to construct low-dimensional CPs as new type of electrode materials for advanced lithium ion batteries.展开更多
A new coordination polymer, [Mn（L）（1,4-bdc）] （L = 11-fluoro-dipyrido[3,2- a：2＂,3 ＂- c]phenazine, 1,4-bdc - benzene-1,4-dicarboxylate）, has been synthesized through the hydrothermal method and characterized by...A new coordination polymer, [Mn（L）（1,4-bdc）] （L = 11-fluoro-dipyrido[3,2- a：2＂,3 ＂- c]phenazine, 1,4-bdc - benzene-1,4-dicarboxylate）, has been synthesized through the hydrothermal method and characterized by elemental analysis, IR and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 9.7544（9）, b = 10.8254（10）, c = 11.5288（10） A, a = 114.1300（10）, β = 96.6110（10）, y = 105.0390（10）°, V= 1038.62（16）/k3, Z= 2, C26H13FMnN404, Mr = 519.34, Dc = 1.661 g/cm3, F（000） = 526, ,u（MoKa） = 0.691 mm^-, R = 0.0405 and wR = 0.0977. The 1,4-bdc dianions link the neighboring Mn（II） atoms to yield a two-dimensional layer structure. The L ligands are attached on both sides of the layer. The π-π interactions between the L ligands of neighboring layers result in a three-dimensional supramolecular architecture.展开更多
A new zinc coordination polymer, [Zn2（bpp）（tpa）2H2O] 1 （bpp=1,3-bis（4-pyridyl）-propane and tpa=terephthalate） has been hydrothermally synthesized and characterized by elemental analysis, IR and single-crystal ...A new zinc coordination polymer, [Zn2（bpp）（tpa）2H2O] 1 （bpp=1,3-bis（4-pyridyl）-propane and tpa=terephthalate） has been hydrothermally synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. X-ray crystal structure analysis reveals that complex 1 crystallizes in monoclinic, space group P2/c with a=18.348（2）, b=10.9080（14）, c=13.7924（18）, β=98.156（2）°, V=2732.5（6）3 , Z=4, C29H24N2O9Zn2 , Mr=675.24, Z=4, F（000）=1376, Dc=1.641 mg/m3 , μ=1.815 mm-1 , the final R=0.0443 and wR=0.0769 for 2715 observed reflections （I〉2σ（I））. The title complex exhibits a two-dimensional （4, 4） sheet structure which is further stacked through face-to-face π-π interactions between the monodentately coordinated pyridine ring of bpp ligand and the phenyl ring of terephthalate ligand to form a 3-dimensional supramolecular structure. Thermogravimetric analyses show that the host framework of the complex is thermally stable up to ca. 400 ℃.展开更多
A novel two-dimensional lead（II） coordination polymer 1, [C11H7Cl2NO3Pb]n, has been prepared by solvothermal reaction of new bridging ligand（5-chloro-quinolin-8-yloxy）acetic acid（HL） with PbCl2, and its structur...A novel two-dimensional lead（II） coordination polymer 1, [C11H7Cl2NO3Pb]n, has been prepared by solvothermal reaction of new bridging ligand（5-chloro-quinolin-8-yloxy）acetic acid（HL） with PbCl2, and its structure was characterized by IR, elemental analysis, TG-DTA and single-crystal X-ray diffraction analysis. The crystal is of monoclinic system, space group P21/c with a = 16.7603（7）, b = 8.6907（4）, c = 8.4745（3）A, β = 101.1110（11）°, C11H7Cl2NO3 Pb, Mr = 479.27, V = 1211.25（9）A3, Z = 4, Dc = 2.628 g/cm^3, F（000） = 880, μ = 14.367 mm^-1, R = 0.0173 and wR = 0.0508. The asymmetric unit contains one lead（II） cation, one（5-chloro-quinolin-8-yloxy）acetate（L） ligand and a chloride ion. The PbII center is hepta-coordinated in a distorted pentagonal bipyramidal geometry. The coordination sphere of the Pb atom is completed by two oxygen atoms and one nitrogen atom of the same L ligand, two bridging chloride ions and two bridging oxygen atoms of two adjacent L ligands. Two PbII centers are linked by the two L ligands to form a C2-symmetric dimer unit with a planar [Pb2O2] ring. Each dimer unit acts as a secondary building unit（SBU） and links adjacent four dimer units by the chloride atoms and oxygen atoms of carboxylate groups of L, forming a two-dimensional array. Such two-dimensional layers are packed through intermolecular C–H…Cl hydrogen bonds into a three-dimensional supramolecular structure. When the dimer unit is viewed as a 4-connected node, 1 is simplified as a 4-nodal 2-D network with square lattices of the diagonal lengths to be 6.079（1）A. The fluorescence emission peak of complex 1 appears near 407 nm.展开更多
A two-dimensional（2D） 44 topological ZnⅡ coordination polymer {[Zn2Cl2（L）（4bpy）2]}∞（H2L = anthracene-9,10-dicarboxylic acid, 4bpy = 4,4ˊ-bipyridine） based on binuclear [Zn2Cl2] nodes has been synthesized an...A two-dimensional（2D） 44 topological ZnⅡ coordination polymer {[Zn2Cl2（L）（4bpy）2]}∞（H2L = anthracene-9,10-dicarboxylic acid, 4bpy = 4,4ˊ-bipyridine） based on binuclear [Zn2Cl2] nodes has been synthesized and characterized by IR, elemental analysis, X-ray powder diffraction and single-crystal X-ray diffraction analysis. Moreover, the luminescent properties of the correspon- ding compound have been briefly investigated.展开更多
A new two-dimensional Pb（Ⅱ） coordination polymer, [Pb2（L）（tpphz）1.5（NO3）2]·H2O（1）, has been obtained by the hydrothermal reaction of tetrapyrido[3,2-a：2′,3′-c：3′′,2′′-h：2′′′,3′′′-j]-phen...A new two-dimensional Pb（Ⅱ） coordination polymer, [Pb2（L）（tpphz）1.5（NO3）2]·H2O（1）, has been obtained by the hydrothermal reaction of tetrapyrido[3,2-a：2′,3′-c：3′′,2′′-h：2′′′,3′′′-j]-phenazine（tpphz） and 2,2′-bipyridyl-3,3′-dicarboxylic acid（H2L）. It crystallizes in monoclinic, space group P21/c with a = 15.344（3）, b = 14.111（3）, c = 21.963（4） ？, β = 106.89（3）o, V = 4550.1（16） ？3, Z = 4, C48H26N13O11Pb2, Mr = 1375.20, Dc = 2.007 g/cm^3, F（000） = 2628, μ（Mo Ka） = 7.471 mm-1, R = 0.0339 and w R = 0.0808. In 1, the two crystallographically independent tpphz ligands adopt the same bis-chelating coordination mode, but they play different roles in the structure of 1. One type of tpphz ligands bridge the Pb（Ⅱ） cations to generate a zigzig chain, where the L anions are located on one side of the chain. Further, adjacent chains are linked by the other type of tpphz ligands into a two-dimensional layer structure. Additionally, the solid state luminescent property of 1 was also studied at room temperature.展开更多
In this work, we report a new two-dimensional Sr（II） coordination polymer, namely, [Sr（L）（phen）（H20）] （1）, based on 3,5-dinitro-salicylic acid （H2L） and 1,10-phenanthroline （phen）. It crystallizes in mon...In this work, we report a new two-dimensional Sr（II） coordination polymer, namely, [Sr（L）（phen）（H20）] （1）, based on 3,5-dinitro-salicylic acid （H2L） and 1,10-phenanthroline （phen）. It crystallizes in monoclinic, space group P2/1 with a = 15.479（3）, b = 9.4020（19）, c = 13.884（3）/k, β= 103.76（3）°, V= 1962.5（7） A3, Z = 4, C19H12SrN4O8, Mr = 511.95, Dc = 1.733 g/cm^3, F（000） = 1024,μ（MoKa） = 2.805 mm^-1, R = 0.0411 and wR = 0.1069. In 1, each L anion bridges three Sr（II） atoms by using carboxylate and hydroxyl groups, yielding a two-dimensional layer structure. The phen ligands are alternately attached to both sides of the layer. The π-π stacking between L and phen in the same layer and hydrogen-bonding interactions between water molecule and carboxylate oxygen atom play an important role in stabilizing the layer structure of 1. The solid state luminescent property of 1 was also studied at room temperature.展开更多
Two N-donor ligands mediated Cd（Ⅱ） coordination polymers, namely,[Cd（L）（dmpz）2]n （1） and {[Cd（L）（atr）05（H20）]（H2O）}n （2） （H2L = methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate, dmpz = 3,5-dimethy...Two N-donor ligands mediated Cd（Ⅱ） coordination polymers, namely,[Cd（L）（dmpz）2]n （1） and {[Cd（L）（atr）05（H20）]（H2O）}n （2） （H2L = methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate, dmpz = 3,5-dimethylpyrazole, and atr= 4-amino-l,2,4-triazole）, havebeen produced. Their structures were characterized by single-crystal X-ray diffraction analysis,elemental analyses and infrared spectra. Compound 1 possesses a one-dimensional （1D） chainstructure and is finally extended into a three-dimensional （3D） supramolecular architecturethough hydrogen bonding interactions. Compound 2 features a two-dimensional （2D） networkwith 4-connected sql topology based on dinuclear Cd（Ⅱ） clusters as nodes, which is alsoassembled into a 3D supramolecular architecture through hydrogen bonding interactions.Furthermore, compounds 1 and 2 exhibit high thermal stabilities and intense fluorescent emissionin the solid, and can be explored as potential luminescent materials.展开更多
In this work,a new two-dimensional Cd（Ⅱ） coordination polymer,[Cd3（L）2（cis-1,4-chdc）2（trans-1,4-chdc）]（1,L = 11-fluoro-dipyrido[3,2-a：2’,3‘-c]phenazine and 1,4-H2 chdc = 1,4-cyclohexanedicarboxylatic acid...In this work,a new two-dimensional Cd（Ⅱ） coordination polymer,[Cd3（L）2（cis-1,4-chdc）2（trans-1,4-chdc）]（1,L = 11-fluoro-dipyrido[3,2-a：2’,3‘-c]phenazine and 1,4-H2 chdc = 1,4-cyclohexanedicarboxylatic acid）,has been prepared under hydrothermal conditions.It crystallizes in triclinic,space group P1 with a = 8.6951（8）,b = 10.8362（9）,c = 14.9445（13） A,α = 76.443（2）,β = 81.8670（10）,γ = 82.0640（10）°,V = 1347.0（2） A^3,Z = 1,C60H48Cd3F2N8O12,Mr = 1448.26,Dc = 1.785 g/cm^3,F（000） = 722,μ（Mo Ka） = 1.255 mm^-1,R = 0.0333 and w R = 0.0790.The 1,4-chdc^2-carboxylates bridge the Cd（Ⅱ） cations to form a tri-nuclear Cd（Ⅱ） cluster,which are held together by the cis-1,4-chdc^2-ligands to generate a double-stranded chain.Further,the trans-1,4-chdc^2-ligands bridge adjacent double-stranded chains to yield an interesting two-dimensional network.The π-π interactions among L ligands of neighboring networks result in an interesting three-dimensional supramolecular architecture.In addition,the thermal behavior and luminescent property of 1 have been studied.展开更多
A new coordination polymer, [Gd（III）（3-H-5-hydroxynicotinato）（ox）l.s（H20）2]n, has been synthesized by a hydrothermal reaction of gadolinium nitrate with 5-hydroxynicotinic acid and ammonium oxalate, and its st...A new coordination polymer, [Gd（III）（3-H-5-hydroxynicotinato）（ox）l.s（H20）2]n, has been synthesized by a hydrothermal reaction of gadolinium nitrate with 5-hydroxynicotinic acid and ammonium oxalate, and its structure has been determined by X-ray crystallography with the following data： triclinic space group PI, CgHgNOIlGd, Mr = 464.42, a = 7.5545（11）, b = 8.1094（12）, c = 10.6947（16） A, a= 103.493（2）, β = 98.385（2）, y= 92.117（2）°, Z= 2, V= 628.5706） A3, F（000） = 444, Dc = 2.454 g.cm^-3,/2 = 5.341 mm^-1, the final R = 0.0188 and wR = 0.0392 for 2634 observed reflections （I 〉 2σ（I））. In the asymmetric unit of the compound, each Gdm ion is bonded to nine oxygen atoms from 3-H-5-hydroxynicotinato and oxalate groups and terminal-coordinated water molecules, respectively, resembling a highly distorted three-capped trigonal geometry. Adjacent GdO9 coordination polyhedra are bridged by three identical independent oxalate groups in a side-by-side manner forming brickwall-like 2D grids, and then further linked through intermolecular hydrogen bonds generating a 3D supramolecular network. Magnetic analysis of the compound shows that weak antiferromagnetic coupling exists among the adjacent Gdm ions.展开更多
Two-dimensional coordination polymers(CPs) have aroused tremendous interest as electrocatalysts because the catalytic performance could be fine-tuned by their well-designed coordination layers with highly accessible a...Two-dimensional coordination polymers(CPs) have aroused tremendous interest as electrocatalysts because the catalytic performance could be fine-tuned by their well-designed coordination layers with highly accessible and active metal sites.However,it remains great challenge for CP-based catalysts to be utilized for electrocatalytic oxidation reactions due to their inefficient activities and low catalytic stabilities.Herein,we applied a mixed-metal strategy to fabricate two-dimensional Co_xNi_(1-x)-CPs with dual active sites for electrocatalytic water and urea oxidation.By metal ratio regulation in the twodimensional layer,an optimized Co_(2/3)Ni_(1/3)-CP exhibits a water oxidation performance with an overpotential of 325 mV at a current density of 10 mA cm^(-2) and a Tafel slope of 86 mV dec^(-1) in alkaline solution for oxygen evolution reaction.Importantly,a lower potential than that of commercial RuO_(2) is observed over20 mA cm^(-2).Co_(2/3)Ni_(1/3)-CP also displays a potential of 1.381 V at 10 mA cm^(-2) for urea oxidation reaction and a Tafel slope of 124 mV dec^(-1).This mixed-metal strategy to maximize synergistic effect of different metal centers may ultimately lead to promising electrocatalysts for small molecule oxidation reaction.展开更多
A new two-dimensional Cd（Ⅱ） coordination polymer, [Cd（2,5-pdch）（H2O）]n·2n（ClO4）·nH2O （2,5-pdch = pyridine-2,5-dicarbohydrazide）, was prepared and characterized by elemental analysis, IR spectra an...A new two-dimensional Cd（Ⅱ） coordination polymer, [Cd（2,5-pdch）（H2O）]n·2n（ClO4）·nH2O （2,5-pdch = pyridine-2,5-dicarbohydrazide）, was prepared and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction analysis. The crystal belongs to monoclinic, space group P21/c with a = 10.905（2）, b = 11.602（1）, c = 15.034（2） A, β = 117.794 （10°, V = 1682.8（4A3, Z = 4, C7H13CdCl2NsO12, Mr = 542.52, Dc = 2.141 g/cm^3,/μ = 1.691 mm^-1, F（000） = 1072, 2（MoKa） = 0.71073A, the final R = 0.0608 and wR = 0.1329 for 2972 observed reflections with I 〉 2σ（I）. Single-crystal X-ray diffraction analysis reveals that the Cd（Ⅱ） atom displays a distorted pentagonal-bipyramidal geometry coordinated by three N atoms and three O atoms from three different 2,5-pdch ligands, and one water molecule. Interestingly, each two Cd（Ⅱ） atoms are bridged by two carbohydrazide groups of the 2,5-pdch ligands to form a dimeric unit, and such dimeric units are further connected by the 2,5-pdch ligand to generate a two-dimensional （4,4）-network.展开更多
A two-dimensional coordination polymer [Co（H2tba）2（DMF）2]n 1 （H2tba = 2-thiobarbituric acid anion, DMF = N,N-dimethylformamide） has been synthesized by CoCl2？6H2O with the 2-thiobarbituric acid ligands under so...A two-dimensional coordination polymer [Co（H2tba）2（DMF）2]n 1 （H2tba = 2-thiobarbituric acid anion, DMF = N,N-dimethylformamide） has been synthesized by CoCl2？6H2O with the 2-thiobarbituric acid ligands under solvothermal conditions. Compound 1 was further characterized by FTIR, elemental analysis, TGA and powder XRD techniques. Single-crystal X-ray diffraction studies revealed that the title compound crystallizes in the monoclinic space group Pbca with a = 12.5948（12）, b = 11.4269（11）, c = 14.8939（15） , V = 2143.5（4） ？3, Z = 4, Dc = 1.523 g·cm-3, F（000） = 1012, μ = 1.038 mm-1, R = 0.0358 and wR2 = 0.0888 （I 〉 2σ（I））. Single-crystal X-ray diffraction analysis reveals that 1 is the first two-dimensional noninterpenetrating （4, 4） net coordination polymer based on the 2-thiobarbituric acid. Coordination polymer 1 exhibits two luminescent emission spectra at 477 and 489 nm with the excitation peak at 273 nm.展开更多
基金supported by the Science and Technology Research Projects of the Education Department of Jilin Province (No. 2012.479)
文摘A metal-organic coordination polymer [Cd（tdc）（bimb）（μ2-H2O）]n （H2tdc = thiophe-ne-2,5-dicarboxylic acid, bimb = 1,4-bis（imidazol-l-yl）-butane） 1 has been hydrothermally synthe- sized and characterized by elemental analysis, IR, TG, luminescence spectrum and single-crystal X-ray diffraction. Colorless crystals crystallize in the triclinic system, space group P^-1 with a = 5.8945（3）, b = 10.3129（5）, c = 11.2226（5） A, a = 95.1430（10）,β = 97.9020（10）, γ = 90.5910（10）°, V = 672.84（6） A^3, C11H11CdN2O5S, Mr= 395.68, De = 1.953 g/cm^3, μ（MoKa） = 1.797 mm^-1, F（000） = 390, Z = 2, the final R = 0.0209 and wR = 0.0508 for 2514 observed reflections （I 〉 2σ（I））. The structure of 1 exhibits a two-dimensional layer-like structure.
基金supported by the grants from Program for New Century Excellent Talents in University (NCET-04-0987)Specialized Research Fund for the Doctoral Program of Higher Education (No 200507550033)
文摘A novel two-dimensional coordination polymer [Ba2（phen）4（tp）2]n （phen = 1,10- phenanthroline, tp = terephthalic acid） has been synthesized with tp as bridge ligands and structurally determined by X-ray crystallography. The crystal belongs to the monoclinic system, space group C2/c, with a = 18.877（4）, b = 18.489（4）, c = 15.658（3） A, β = 103.61（3）°, V= 5311.5（19）A^3, C32H20O4N4Ba, Mr = 661.86, Z= 8, F（000） = 2624,μ= 1.542 mm^-1, Dc= 1.655 g/cm^3, the final R = 0.0228 and wR = 0.0554 for 6063 observed reflections （I 〉 2σ（I））. The structural analysis shows that each tp ligand bridges barium atoms to form a two-dimensional infinite layer. There are aromatic π-π stacking interactions between neighboring layers, and aromatic π-π interactions further extend such layers into a three-dimensional supramolecular framework.
基金This work was supported by the National Natural Science Foundation of China (No. 20272008)
文摘A 2D lamellar metal-organic coordination polymer [2-（1,3）-dithian-2-ylidene malonate] diaquoicadmium（Ⅱ） hydrate, [Cd（dym）（H2O）2（H2O）], （dym = 2-（1,3）-dithian-2-ylidene malonate）, has been prepared by conventional solution reaction. The structure analysis suggests that the polymer crystallized in orthorhombic system with space group Pbca and the final R indices （I 〉2σ（I））： R1 = 0.0236 and wR2= 0.0738. Crystal data： a = 12.6138（5）, b = 8.4528（3）, c = 22.5867（8） A°, V = 2409.8（15）A°^3, Z = 3, F（000） = 1520, Dc = 1.482 g/cm^3,μ（MoKα） = 0.990 mm^-1 and Mr= 384.69 g/mol. The Cd（Ⅱ） ion is in a disordered triangle prism environment. The Cd-O distances are in the range of 2.2643（14）-2.3641（15）A°. In the crystal, the Cd atoms are arranged at the comers of honeycomb-like hexagonal 24-membered macrometallacycle. There is a weak C-H...S interaction between the 1,3-dithiocyclohexyl groups of two adjacent dym ligands.
基金supported by the National Natural Science Foundation of China (No. 40743017)the Open Foundation of Jiangsu Key Laboratory of Precious Metals Chemistry (SYGK0706)
文摘A new two-dimensional （2D） manganese（II） coordination polymer {[Mn（bidc）（H2O）2]· 2H2O}n （H2bidc = benzimidazole-5,6-dicarboxylic acid） was synthesized, and characterized by X-ray crystallography and other measurements. The complex crystallizes in the orthorhombic system, space group Pbca with a = 7.0218（7）, b = 17.9701（18）, c = 19.0697（19）, V = 2406.3（4）3, Z = 8, Dc = 1.823 g/cm3, Mr = 330.14, F（000） = 1344, μ（MoKα） = 1.140 mm-1, S = 1.055, R = 0.0305 and wR = 0.1012 for 2130 observed reflections （I 2σ（I））. The title complex consists of a novel 2D network with a topology of short symbol （4.82）（4.82）.
基金supported by the National Key Research and Development Program of China (No.2018YFA0902801)the National Natural Science Foundations of China (Nos.21775169,21801259 and 21974153)+4 种基金the Scientific Technology Project of Shenzhen City (No.JCYJ20200109142410170)the Scientific Technology Project of Guangzhou City (No.202103000003)the Guangdong Natural Science Foundation (Nos.2018A030313290,2019A1515010587)the Guangdong Science and Technology Plan Project (No.2020B1212060077)the Fundamental Research Funds for the Central Universities,SYSU (No.19lgpy142)。
文摘A reliable and sensitive strategy which can assess nucleic acid levels in living cells would be essential for fundamental research of biomedical applications. Some nanomaterial-based fluorescence biosensors recently developed for detecting nucleic acids, however, are often with expensive, complicated and timeconsuming preparation process. Here, by using a facile bottom-up synthesis method, a two-dimensional(2 D) coordination polymer(CP) nanosheet, [Cu(tz)](Htz = 1,2,4-triazole), was successfully prepared after optimizing reaction conditions. These ultrathin CP nanosheets with thickness of 4.7 ± 1.1 nm could readily form nanosensors by assembly with DNA probes, which exhibited a low limit of detection(LOD)for p53 DNA fragment as 144 pmol/L. Furthermore, by integrating [Cu(tz)] nanosheets with hybridization chain reaction(HCR) probes, mi R-21, one kind of micro RNA upregulated in many cancer cells, can be sensitively detected with a LOD of 100 pmol/L and monitored in living cells, giving consistent results with those obtained by quantitative reverse-transcription polymerase chain reaction(q RT-PCR) analysis.Thus [Cu(tz)] nanosheets, which not only possess much better nucleic acids sensing performance than bulk cystals, but also exhibit nucleic acid delivery functions, could be used as a novel nanoplatform in biomedical imaging and sensing applications.
基金supported by the Education Office of Jilin Province(No.2013212)
文摘A novel two-dimensional Mn（II） coordination polymer, [Mn3（L）R（cis-chdc）fftrans- chdc）]n （L = 2-amino-4-（1H-imidazo[4,5-J][1,10]phenanthrolin-2-yl）phenol and chdc = 1,4-cyclo- hexanedicarboxylate）, has been hydrothermally synthesized and characterized by elemental analysis, IR, TG PL and single-crystal X-ray diffraction. Crystallographic data for this compound： monoclinic space group P2/n with a = 11.0058（13）, b = 9.0179（11）, c = 28.431（3） A, β = 92.850（2）°, V = 2818.3（6） A3, Z = 2, C62Hs6Mn3N10O14, Mr = 1329.99, Dc = 1.567 g/cm3, F（000） = 1370, p（MoKa） = 0.742 mm-1, R = 0.0553 and wR = 0.1421. The chdc carboxylates bridge the Mn（II） atoms to form a trinuclear Mn（lI） cluster. The cis-chdc ligands are held together by the trinuclear Mn（II） clusters to result in a chain structure. Further, the trans-chdc ligands link adjacent chains to furnish a two-dimensional network. The π-π interactions between neighboring layers link the adjacent layers into a three-dimensional supramolecular architecture. Moreover, the N-H...O and O-H...O hydrogen bonds further stabilize the 3D supramolecular architecture.
基金financial support of this work by the National Natural Science Foundation of China(No.21861039)Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX24_2530)the Fundamental Research Funds for the Central Universities。
文摘Acceptorless dehydrogenative coupling of pyridinemethanol with ketones is one of the most reliable methodologies to access functionalized 1,8-naphthyridine derivatives.However,it is challenging to develop environmentally friendly catalytic systems,especially in constructing efficient and recyclable catalysts under water or solvent-free conditions.Here,we designed two novel coordination polymers Cd-CPs and Fe-CPs to investigate their catalytic performance in water.Gratifyingly,it was observed that Cd-CPs as a multifunctional catalyst was successfully applied to establish a universal pathway for direct fabrication of 1,8-naphthyridine derivatives under water conditions,while it was effective for the synthesis of1,3,5-triazines through acceptorless dehydrogenative coupling strategies.The features of broad substrate,high atom efficiency,and good catalyst reusability highlight the feasibility of this transformation.In additional,we demonstrated the spindle-like structures Fe-P,derived from the Fe-CPs via phosphorylation,which can be used as an efficient electrocatalyst for oxygen evolution reaction with good stability.This work provides two highly efficient non-noble metal catalysts for functionalized 1,8-naphthyridine derivatives production and oxygen evolution reaction,and opens a new avenue to further fabricate diverse metal catalysts with high catalytic performance in water.
基金supported by the National Natural Science Foundation of China(21622105,21501071,21421001)Shenzhen Fundamental Research Project(JCYJ20160525164227350)+1 种基金the Ministry of Education of China(B12015)the Natural Science Foundation of Tianjin(18JCJQJC47200)
文摘A well-designed redox-active organic linker,pyrazine-2,3,5,6-tetracarboxylate(H_4pztc)with brimming active sites for lithium ions storage was utilized to construct coordination polymers(CPs)via a facile hydrothermal reaction.Those two isostructural two-dimensional(2D)CPs,namely[M_2(pztc)(H_2O)_6]_n(M=Co for 1 and Ni for 2),delivered excellent reversible capacities and stable cycling performance as anodes in lithium ion batteries.As demonstrated in electrochemical studies,1 and 2 can achieve highly reversible capacities of 815 and 536 mA h g^(-1)at 200 mA g^(-1)for 150 cycles,respectively,best performed for the reported2D-CP-based anode materials.The electrochemical mechanism studies showed that the remarkable performances can be ascribed to the synergistic Li-storage redox reactions of metal centers and organic moieties.Our work highlights the opportunities of using a well-designed organic ligand to construct low-dimensional CPs as new type of electrode materials for advanced lithium ion batteries.
基金Supported by the Institute Foundation of Siping City (No.2009011)
文摘A new coordination polymer, [Mn（L）（1,4-bdc）] （L = 11-fluoro-dipyrido[3,2- a：2＂,3 ＂- c]phenazine, 1,4-bdc - benzene-1,4-dicarboxylate）, has been synthesized through the hydrothermal method and characterized by elemental analysis, IR and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 9.7544（9）, b = 10.8254（10）, c = 11.5288（10） A, a = 114.1300（10）, β = 96.6110（10）, y = 105.0390（10）°, V= 1038.62（16）/k3, Z= 2, C26H13FMnN404, Mr = 519.34, Dc = 1.661 g/cm3, F（000） = 526, ,u（MoKa） = 0.691 mm^-, R = 0.0405 and wR = 0.0977. The 1,4-bdc dianions link the neighboring Mn（II） atoms to yield a two-dimensional layer structure. The L ligands are attached on both sides of the layer. The π-π interactions between the L ligands of neighboring layers result in a three-dimensional supramolecular architecture.
基金supported by the Education Office of Anhui Province (No. 2011SQRL080)
文摘A new zinc coordination polymer, [Zn2（bpp）（tpa）2H2O] 1 （bpp=1,3-bis（4-pyridyl）-propane and tpa=terephthalate） has been hydrothermally synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. X-ray crystal structure analysis reveals that complex 1 crystallizes in monoclinic, space group P2/c with a=18.348（2）, b=10.9080（14）, c=13.7924（18）, β=98.156（2）°, V=2732.5（6）3 , Z=4, C29H24N2O9Zn2 , Mr=675.24, Z=4, F（000）=1376, Dc=1.641 mg/m3 , μ=1.815 mm-1 , the final R=0.0443 and wR=0.0769 for 2715 observed reflections （I〉2σ（I））. The title complex exhibits a two-dimensional （4, 4） sheet structure which is further stacked through face-to-face π-π interactions between the monodentately coordinated pyridine ring of bpp ligand and the phenyl ring of terephthalate ligand to form a 3-dimensional supramolecular structure. Thermogravimetric analyses show that the host framework of the complex is thermally stable up to ca. 400 ℃.
基金Supported by Key Laboratory of Organic Synthesis of Jiangsu Province(KJS1308)
文摘A novel two-dimensional lead（II） coordination polymer 1, [C11H7Cl2NO3Pb]n, has been prepared by solvothermal reaction of new bridging ligand（5-chloro-quinolin-8-yloxy）acetic acid（HL） with PbCl2, and its structure was characterized by IR, elemental analysis, TG-DTA and single-crystal X-ray diffraction analysis. The crystal is of monoclinic system, space group P21/c with a = 16.7603（7）, b = 8.6907（4）, c = 8.4745（3）A, β = 101.1110（11）°, C11H7Cl2NO3 Pb, Mr = 479.27, V = 1211.25（9）A3, Z = 4, Dc = 2.628 g/cm^3, F（000） = 880, μ = 14.367 mm^-1, R = 0.0173 and wR = 0.0508. The asymmetric unit contains one lead（II） cation, one（5-chloro-quinolin-8-yloxy）acetate（L） ligand and a chloride ion. The PbII center is hepta-coordinated in a distorted pentagonal bipyramidal geometry. The coordination sphere of the Pb atom is completed by two oxygen atoms and one nitrogen atom of the same L ligand, two bridging chloride ions and two bridging oxygen atoms of two adjacent L ligands. Two PbII centers are linked by the two L ligands to form a C2-symmetric dimer unit with a planar [Pb2O2] ring. Each dimer unit acts as a secondary building unit（SBU） and links adjacent four dimer units by the chloride atoms and oxygen atoms of carboxylate groups of L, forming a two-dimensional array. Such two-dimensional layers are packed through intermolecular C–H…Cl hydrogen bonds into a three-dimensional supramolecular structure. When the dimer unit is viewed as a 4-connected node, 1 is simplified as a 4-nodal 2-D network with square lattices of the diagonal lengths to be 6.079（1）A. The fluorescence emission peak of complex 1 appears near 407 nm.
基金Supported by the key project of Science,the Technology Department of Henan province(No.112102210371)the science and technology research projects of Education Department of Henan province(No.12B150003)
文摘A two-dimensional（2D） 44 topological ZnⅡ coordination polymer {[Zn2Cl2（L）（4bpy）2]}∞（H2L = anthracene-9,10-dicarboxylic acid, 4bpy = 4,4ˊ-bipyridine） based on binuclear [Zn2Cl2] nodes has been synthesized and characterized by IR, elemental analysis, X-ray powder diffraction and single-crystal X-ray diffraction analysis. Moreover, the luminescent properties of the correspon- ding compound have been briefly investigated.
基金Supported by the Institute Foundation of Siping city(No.2013036)
文摘A new two-dimensional Pb（Ⅱ） coordination polymer, [Pb2（L）（tpphz）1.5（NO3）2]·H2O（1）, has been obtained by the hydrothermal reaction of tetrapyrido[3,2-a：2′,3′-c：3′′,2′′-h：2′′′,3′′′-j]-phenazine（tpphz） and 2,2′-bipyridyl-3,3′-dicarboxylic acid（H2L）. It crystallizes in monoclinic, space group P21/c with a = 15.344（3）, b = 14.111（3）, c = 21.963（4） ？, β = 106.89（3）o, V = 4550.1（16） ？3, Z = 4, C48H26N13O11Pb2, Mr = 1375.20, Dc = 2.007 g/cm^3, F（000） = 2628, μ（Mo Ka） = 7.471 mm-1, R = 0.0339 and w R = 0.0808. In 1, the two crystallographically independent tpphz ligands adopt the same bis-chelating coordination mode, but they play different roles in the structure of 1. One type of tpphz ligands bridge the Pb（Ⅱ） cations to generate a zigzig chain, where the L anions are located on one side of the chain. Further, adjacent chains are linked by the other type of tpphz ligands into a two-dimensional layer structure. Additionally, the solid state luminescent property of 1 was also studied at room temperature.
基金Supported by the Institute Foundation of Siping City(No.2013036)
文摘In this work, we report a new two-dimensional Sr（II） coordination polymer, namely, [Sr（L）（phen）（H20）] （1）, based on 3,5-dinitro-salicylic acid （H2L） and 1,10-phenanthroline （phen）. It crystallizes in monoclinic, space group P2/1 with a = 15.479（3）, b = 9.4020（19）, c = 13.884（3）/k, β= 103.76（3）°, V= 1962.5（7） A3, Z = 4, C19H12SrN4O8, Mr = 511.95, Dc = 1.733 g/cm^3, F（000） = 1024,μ（MoKa） = 2.805 mm^-1, R = 0.0411 and wR = 0.1069. In 1, each L anion bridges three Sr（II） atoms by using carboxylate and hydroxyl groups, yielding a two-dimensional layer structure. The phen ligands are alternately attached to both sides of the layer. The π-π stacking between L and phen in the same layer and hydrogen-bonding interactions between water molecule and carboxylate oxygen atom play an important role in stabilizing the layer structure of 1. The solid state luminescent property of 1 was also studied at room temperature.
基金supported by the National Natural Science of Foundation of China(No.21671094)
文摘Two N-donor ligands mediated Cd（Ⅱ） coordination polymers, namely,[Cd（L）（dmpz）2]n （1） and {[Cd（L）（atr）05（H20）]（H2O）}n （2） （H2L = methyl-3-hydroxy-5-carboxy-2-thiophenecarboxylate, dmpz = 3,5-dimethylpyrazole, and atr= 4-amino-l,2,4-triazole）, havebeen produced. Their structures were characterized by single-crystal X-ray diffraction analysis,elemental analyses and infrared spectra. Compound 1 possesses a one-dimensional （1D） chainstructure and is finally extended into a three-dimensional （3D） supramolecular architecturethough hydrogen bonding interactions. Compound 2 features a two-dimensional （2D） networkwith 4-connected sql topology based on dinuclear Cd（Ⅱ） clusters as nodes, which is alsoassembled into a 3D supramolecular architecture through hydrogen bonding interactions.Furthermore, compounds 1 and 2 exhibit high thermal stabilities and intense fluorescent emissionin the solid, and can be explored as potential luminescent materials.
基金Supported by the Institute Foundation of Siping City(No.2013036)
文摘In this work,a new two-dimensional Cd（Ⅱ） coordination polymer,[Cd3（L）2（cis-1,4-chdc）2（trans-1,4-chdc）]（1,L = 11-fluoro-dipyrido[3,2-a：2’,3‘-c]phenazine and 1,4-H2 chdc = 1,4-cyclohexanedicarboxylatic acid）,has been prepared under hydrothermal conditions.It crystallizes in triclinic,space group P1 with a = 8.6951（8）,b = 10.8362（9）,c = 14.9445（13） A,α = 76.443（2）,β = 81.8670（10）,γ = 82.0640（10）°,V = 1347.0（2） A^3,Z = 1,C60H48Cd3F2N8O12,Mr = 1448.26,Dc = 1.785 g/cm^3,F（000） = 722,μ（Mo Ka） = 1.255 mm^-1,R = 0.0333 and w R = 0.0790.The 1,4-chdc^2-carboxylates bridge the Cd（Ⅱ） cations to form a tri-nuclear Cd（Ⅱ） cluster,which are held together by the cis-1,4-chdc^2-ligands to generate a double-stranded chain.Further,the trans-1,4-chdc^2-ligands bridge adjacent double-stranded chains to yield an interesting two-dimensional network.The π-π interactions among L ligands of neighboring networks result in an interesting three-dimensional supramolecular architecture.In addition,the thermal behavior and luminescent property of 1 have been studied.
文摘A new coordination polymer, [Gd（III）（3-H-5-hydroxynicotinato）（ox）l.s（H20）2]n, has been synthesized by a hydrothermal reaction of gadolinium nitrate with 5-hydroxynicotinic acid and ammonium oxalate, and its structure has been determined by X-ray crystallography with the following data： triclinic space group PI, CgHgNOIlGd, Mr = 464.42, a = 7.5545（11）, b = 8.1094（12）, c = 10.6947（16） A, a= 103.493（2）, β = 98.385（2）, y= 92.117（2）°, Z= 2, V= 628.5706） A3, F（000） = 444, Dc = 2.454 g.cm^-3,/2 = 5.341 mm^-1, the final R = 0.0188 and wR = 0.0392 for 2634 observed reflections （I 〉 2σ（I））. In the asymmetric unit of the compound, each Gdm ion is bonded to nine oxygen atoms from 3-H-5-hydroxynicotinato and oxalate groups and terminal-coordinated water molecules, respectively, resembling a highly distorted three-capped trigonal geometry. Adjacent GdO9 coordination polyhedra are bridged by three identical independent oxalate groups in a side-by-side manner forming brickwall-like 2D grids, and then further linked through intermolecular hydrogen bonds generating a 3D supramolecular network. Magnetic analysis of the compound shows that weak antiferromagnetic coupling exists among the adjacent Gdm ions.
基金supported by the National Natural Science Foundation of China (Grant number 21622105 and 21931004)the Natural Science Foundation of Tianjin (Grant number 18JCJQJC47200)+2 种基金the Fundamental Research Funds for the Central UniversitiesNankai University (63201016 and 63201043)the Ministry of Education of China (Grant number B12015)。
文摘Two-dimensional coordination polymers(CPs) have aroused tremendous interest as electrocatalysts because the catalytic performance could be fine-tuned by their well-designed coordination layers with highly accessible and active metal sites.However,it remains great challenge for CP-based catalysts to be utilized for electrocatalytic oxidation reactions due to their inefficient activities and low catalytic stabilities.Herein,we applied a mixed-metal strategy to fabricate two-dimensional Co_xNi_(1-x)-CPs with dual active sites for electrocatalytic water and urea oxidation.By metal ratio regulation in the twodimensional layer,an optimized Co_(2/3)Ni_(1/3)-CP exhibits a water oxidation performance with an overpotential of 325 mV at a current density of 10 mA cm^(-2) and a Tafel slope of 86 mV dec^(-1) in alkaline solution for oxygen evolution reaction.Importantly,a lower potential than that of commercial RuO_(2) is observed over20 mA cm^(-2).Co_(2/3)Ni_(1/3)-CP also displays a potential of 1.381 V at 10 mA cm^(-2) for urea oxidation reaction and a Tafel slope of 124 mV dec^(-1).This mixed-metal strategy to maximize synergistic effect of different metal centers may ultimately lead to promising electrocatalysts for small molecule oxidation reaction.
文摘A new two-dimensional Cd（Ⅱ） coordination polymer, [Cd（2,5-pdch）（H2O）]n·2n（ClO4）·nH2O （2,5-pdch = pyridine-2,5-dicarbohydrazide）, was prepared and characterized by elemental analysis, IR spectra and single-crystal X-ray diffraction analysis. The crystal belongs to monoclinic, space group P21/c with a = 10.905（2）, b = 11.602（1）, c = 15.034（2） A, β = 117.794 （10°, V = 1682.8（4A3, Z = 4, C7H13CdCl2NsO12, Mr = 542.52, Dc = 2.141 g/cm^3,/μ = 1.691 mm^-1, F（000） = 1072, 2（MoKa） = 0.71073A, the final R = 0.0608 and wR = 0.1329 for 2972 observed reflections with I 〉 2σ（I）. Single-crystal X-ray diffraction analysis reveals that the Cd（Ⅱ） atom displays a distorted pentagonal-bipyramidal geometry coordinated by three N atoms and three O atoms from three different 2,5-pdch ligands, and one water molecule. Interestingly, each two Cd（Ⅱ） atoms are bridged by two carbohydrazide groups of the 2,5-pdch ligands to form a dimeric unit, and such dimeric units are further connected by the 2,5-pdch ligand to generate a two-dimensional （4,4）-network.
基金Financial support from the Fundamental Research Funds for the Central Universities(12D10525,13D110536,2232014D3-10)the Open Project Program of Key Laboratory of Eco-Textiles,Ministry of Education,Donghua Universitythe Open Project Program of National Engineering Research Center for Dyeing and Finishing of Textiles,Donghua University
文摘A two-dimensional coordination polymer [Co（H2tba）2（DMF）2]n 1 （H2tba = 2-thiobarbituric acid anion, DMF = N,N-dimethylformamide） has been synthesized by CoCl2？6H2O with the 2-thiobarbituric acid ligands under solvothermal conditions. Compound 1 was further characterized by FTIR, elemental analysis, TGA and powder XRD techniques. Single-crystal X-ray diffraction studies revealed that the title compound crystallizes in the monoclinic space group Pbca with a = 12.5948（12）, b = 11.4269（11）, c = 14.8939（15） , V = 2143.5（4） ？3, Z = 4, Dc = 1.523 g·cm-3, F（000） = 1012, μ = 1.038 mm-1, R = 0.0358 and wR2 = 0.0888 （I 〉 2σ（I））. Single-crystal X-ray diffraction analysis reveals that 1 is the first two-dimensional noninterpenetrating （4, 4） net coordination polymer based on the 2-thiobarbituric acid. Coordination polymer 1 exhibits two luminescent emission spectra at 477 and 489 nm with the excitation peak at 273 nm.
