Terpyridine-capped poly（ethylene glycol） （PEG） was synthesized as a novel polymeric ligand and rare earth complex was prepared from Eu（NO3）3 and the telechelic macromolecules. The structure of the complex was ch...Terpyridine-capped poly（ethylene glycol） （PEG） was synthesized as a novel polymeric ligand and rare earth complex was prepared from Eu（NO3）3 and the telechelic macromolecules. The structure of the complex was characterized by 1H NMR, FT-IR, UV-vis and fluores-cence spectroscopy. Strong fluorescent emission of the complex was observed at 593 and 616 nm upon the excitation of 300 nm. The fluo-rescent emission was quenched upon addition of trace amount of diethyl chlorophosphate （DCP）. And the observed Ksv values for DCP were measured to be 0.568×10^3 and 0.89×10^3 L/mol for quenching at 593 and 616 nm, which indicated the detection limit for DCP was about 0.014 mmol/L. These results showed that the terpyridine-lanthanide complex could be an effective chemosensor with a potential application in the detection of organophosphates.展开更多
A new Cd（II） complex [Cd（C12H6OaN2）（Phen）ffH2O）]＇3H2O with 2,2＂-bipyridine- 3,3＂-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows： monoclinic, space grou...A new Cd（II） complex [Cd（C12H6OaN2）（Phen）ffH2O）]＇3H2O with 2,2＂-bipyridine- 3,3＂-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows： monoclinic, space group P2dn, a = 12.8458（5）, b = 17.9131（7）, c = 15.2960（6） A, β = 111.7430（10）°, V = 3269.3（2） A3, Dc = 1.581 g/cm3, Z = 4,/a（MoKa） = 0.731 mm-1, F（000） = 1580, the R = 0.0244 and wR = 0.0605. In the title complex, the central Cd（ll） ion is located in a distorted octahedral coordination environment. The electrochemical and fluorescent properties of the title complex were studied. The results show that the electron transfer of the title complex is irreversible in the electrode reaction and it has a broad emission peak in the range of 470-508 nm with the excitation wavelength of 488 nm.展开更多
Tetragonal structural(t-NdVO4)nanorod-arrays were fabricated by simple one-pot hydrothermal method.The phase,morphology and microstructure of NdVO4 were characterized by X-ray diffractometer,scanning electron microsco...Tetragonal structural(t-NdVO4)nanorod-arrays were fabricated by simple one-pot hydrothermal method.The phase,morphology and microstructure of NdVO4 were characterized by X-ray diffractometer,scanning electron microscope(SEM),transmission electron microscope(TEM),dispersive X-ray spectrometer(EDS)and selected area electron diffraction(SAED)techniques.t-NdVO4 nanorods are single-crystalline with a length of 100 nm and a diameter of 25 nm,which grow orientally along the direction of(112)crystalline plane and self-assemble to form nanorod-arrays.The results show that Eu^3+-doping interrupts the formation of NdVO4 nanorod-arrays,and then leads to the red-shift of the strongest luminescence emission of Nd3+transition from 4D3/2 state to 4I11/2 and decreases its intensity of the fluorescence emission at 400 nm sharply.The research results have some reference values to optimize the photoluminescence performance of rare earth vanadates.展开更多
A new copper（II） complex Cu2（L）a（2,2＇-bipy）2（H2O）2 （1） has been synthesized with 2-benzoylbenzoic acid （HL） and 2,2＇-bipyridin as ligands. The crystal belongs to a monoclinic system with space group Cc, ...A new copper（II） complex Cu2（L）a（2,2＇-bipy）2（H2O）2 （1） has been synthesized with 2-benzoylbenzoic acid （HL） and 2,2＇-bipyridin as ligands. The crystal belongs to a monoclinic system with space group Cc, a = 13.9979（II）, b = 15.9888（13）, c = 30.306（3） A, β = 100.8700（10）°, V= 6661.1（10） A3, Dc= 1.372 g/cm3, Z = 8, F（000） = 2840, the final GOOF = 1.018, R= 0.0685, and wR= 0.1731. There are two mononuclear Cu（L）2（2,2＇-bipy）（H20） units in the crystal of 1. Each Cu（II） cation is coordinated by five atoms. The magnetic and fluorescent properties of 1 were studied. The results show that 1 exhibits weak paramagnetism, and when the excitation wavelength is at 616 nm, it has an intense fluorescent emission band around 482 nm.展开更多
Two dehydroabietic acid-based arylamines have been synthesized and characterized by FTIR, 1H NMR, 13C NMR, MS spectra and elemental analysis. Their spatial structures were determined by X-ray diffraction analysis. UV-...Two dehydroabietic acid-based arylamines have been synthesized and characterized by FTIR, 1H NMR, 13C NMR, MS spectra and elemental analysis. Their spatial structures were determined by X-ray diffraction analysis. UV-Vis absorption and fluorescence spectral characteristics of these compounds in methanol were investigated. Their fluorescence emission spectra in different polarity solvents were further evaluated. Fluorescent properties and structural relationship of the compounds showed that fluorescence intensity and quantum yield inversely increase with the non-coplanar degree. In addition, the solvent polarity has different effects on the fluorescence emission spectra of two compounds.展开更多
Two coordination polymers（CPs）,{[Ag（ADA）（0.5）（DPE）]·H2O}n（1） and {[Ag（ADA）（0.5）（Bipy）（0.5）]·H2O}n（2）,（H2ADA = 3,3-azodibenzoic acid,DPE = 1,2-di（4-pyridyl）-ethylene,Bipy = 4,4？-bipyri...Two coordination polymers（CPs）,{[Ag（ADA）（0.5）（DPE）]·H2O}n（1） and {[Ag（ADA）（0.5）（Bipy）（0.5）]·H2O}n（2）,（H2ADA = 3,3-azodibenzoic acid,DPE = 1,2-di（4-pyridyl）-ethylene,Bipy = 4,4？-bipyridine）,have been synthesized via solvothermal reactions of Ag＋ with ADA^2- and/or DPE,Bipy.CPs 1 and 2 were characterized by elemental analyses,IR spectra,thermal behaviors,and X-ray single-crystal diffraction.CPs 1 and 2 feature ＂Ag···Ag＂ subunits.CP 1 shows a 3D construction,in which the ＂Ag···Ag＂ subunits extend through ADA^2- and DPE ligands using μ6-kO,O;kO;kO;kO,O;kO;kO and μ2-kO;kO coordination modes,respectively.It crystallizes in triclinic system,space group P1,with a = 0.3808（18）,b = 1.2476（6）,c = 1.309（6） nm,α = 76.757（5）,β = 84.649（5）,γ = 86.809（5）o,V = 0.6024（5） nm^3,Z = 2,Mr = 351.11,C（13）H（11）AgN2O3,Dc = 1.936 g/cm3,F（000） = 348,S = 1.064,R = 0.0323 and w R = 0.0689.CP 2 exhibits a 3 D supramolecular structure,in which the ＂Ag···Ag＂ subunits are connected by ADA^2- and DPE ligands with μ6-kO;kO;kO,O;kO;kO and μ2-kO;kO coordination modes,respectively.Ultimately,through hydrogen bond and π···π interaction,the ＂Ag···Ag＂ subunits stabilize the 3D supramolecular structure of 2.It crystallizes in monoclinic,space group C2/c,with a = 25.301（15）,b = 13.197（8）,c = 6.970（4） nm,β = 102.597（7）o,V = 2.271（2） nm^3,Z = 8,C（12）H（10）AgN2O（2.50）,Mr = 330.09,Dc = 1.931 g/cm^3,F（000） = 1304,S = 1.082,R = 0.1107 and wR = 0.2984.The fluorescence properties of CPs 1 and 2 have been also investigated.展开更多
We synthesized a series of rare earth complexes with benzoic acid ramification containing different substitute groups or the same substitute group in different position; test the fluorescence property using fluorescen...We synthesized a series of rare earth complexes with benzoic acid ramification containing different substitute groups or the same substitute group in different position; test the fluorescence property using fluorescence spectrometer of the complexes, and discussed the influence of different substitute group and the position of substitute group on the fluorescent properties of the rare earth complexes. The results showed that different substitute group and the position of substitute group on the benzene ring had important influence on the fluorescent properties of the benzoic acid rare earth complexes, when the other conditions were the same. The fluorescence effect of para-position ligand was better than ortho-position and meta-position ligand. For the benzoic acid complexes, their fluorescence intensity has relationship with the excellent absorption coefficient of the ligand and the high efficient ligand-to-trivalent rare earth ion energy transfer. Furthermore, when the ratio of Ln3+, ligand, phen was 1∶3∶1, the fluorescence properties of rare earth complex was the best.展开更多
A new type of binuclear europlum β-diketone chelates Eum Y1-m(TTA)3 phen (0≤m≤1) and the influence of the proportion of Y on fluorescence intensity of the Eu-complexes were studied. It was found the proportion of Y...A new type of binuclear europlum β-diketone chelates Eum Y1-m(TTA)3 phen (0≤m≤1) and the influence of the proportion of Y on fluorescence intensity of the Eu-complexes were studied. It was found the proportion of Y3+ could affect the fluorescence properties and the film formation seriously. only m≥0.5.Y3+ could increase the luminescent intensity and improve the film formalion. As a resull. three new binuclear europium β-diketone chelales consisted of Eu, Y1-m (TTA)3phen (m=0.9. 0.7 and 0.5) were designed and synthesized. Their structures were elucidated by IR. UV. DSC and Elementary Analysis. Their PL properties were studied. The results showed that the three binuclear europium β-diketone chelates had better PL properties and film formation than Eu(TYA)3phen. They could emit sharply red light, and fluorescenl wavelength of them was all at 613nm (half bandwidth 10nm). They can be used as red organic electroluminescent materials (OELMs) in organic electrolminescent devices (OELDS).展开更多
By using a two-stage soapless emulsion polymerization, four kinds of core-shell nanoparticles have been prepared,which are composed of a polystyrene core having an average diameter of 256 nm and a poly(methyl methacry...By using a two-stage soapless emulsion polymerization, four kinds of core-shell nanoparticles have been prepared,which are composed of a polystyrene core having an average diameter of 256 nm and a poly(methyl methacrylate-co-acrylicacid) shell. The transmission electron microscopy (TEM) micrographs and the atomic force microscopy (AFM) imagesevidenced the presence of a core-shell structure. In the infrared spectra, the shift of v_(COOH) to lower wavenumber withincreasing Eu^(3+) ion content indicates that coordination between the oxygen of the carboxylic group and Eu^(3+) has occurred.The fluorescence intensity of ~5D_0-~7F_2 transition was observed to reach its maximum with a carboxyl group molar percentageof 40% in the shell and an Eu^(3+)/--COO^- molar ratio of 1:3. The fluorescence intensity ratio of ~5D_0-~7F_2 to ~5D_0-~7F_1 transition reached its maximum with an Eu^(3+)/--COO^- molar ratio of 1:3 for all the four series.展开更多
Herein,antibacterial silver‑doped fluorescent carbon dots(Ag‑CDs)were synthesized through a stepwise hydrothermal method,with polyethyleneimine(PEI),citric acid(CA),and silver nitrate(AgNO3)serving as precursors.The a...Herein,antibacterial silver‑doped fluorescent carbon dots(Ag‑CDs)were synthesized through a stepwise hydrothermal method,with polyethyleneimine(PEI),citric acid(CA),and silver nitrate(AgNO3)serving as precursors.The applicability and antimicrobial efficacy of these nanomaterials were systematically investigated for metal ion sensing.Experimental evidence demonstrated that the Ag‑CDs exhibited a pronounced fluorescence quenching response toward ferric ions(Fe^(3+)),enabling their quantitative determination via a linear concentration‑dependent relationship.These Ag‑CDs exhibited significant inhibitory effects on biofilm growth and disruption for both Escherichia coli and Staphylococcus aureus.Mechanism investigations indicate that Ag‑CDs induced the death of Escherichia coli and Pseudomonas aeruginosa by disrupting their bacterial morphology and structure,triggering the generation of intracellular reactive oxygen species(ROS),and impairing their antioxidant defense system.展开更多
Six new lanthanide complexes:[Ln(3,4-DEOBA)3(4,4'-DM-2,2'-bipy)]2·2C_(2)H_(5)OH,[Ln=Dy(1),Eu(2),Tb(3),Sm(4),Ho(5),Gd(6);3,4-DEOBA-=3,4-diethoxybenzoate,4,4'-DM-2,2'-bipy=4,4'-dimethyl-2,2'...Six new lanthanide complexes:[Ln(3,4-DEOBA)3(4,4'-DM-2,2'-bipy)]2·2C_(2)H_(5)OH,[Ln=Dy(1),Eu(2),Tb(3),Sm(4),Ho(5),Gd(6);3,4-DEOBA-=3,4-diethoxybenzoate,4,4'-DM-2,2'-bipy=4,4'-dimethyl-2,2'-bipyridine]were successfully synthesized by the volatilization of the solution at room temperature.The crystal structures of six complexes were determined by single-crystal X-ray diffraction technology.The results showed that the complexes all have a binuclear structure,and the structures contain free ethanol molecules.Moreover,the coordination number of the central metal of each structural unit is eight.Adjacent structural units interact with each other through hydrogen bonds and further expand to form 1D chain-like and 2D planar structures.After conducting a systematic study on the luminescence properties of complexes 1-4,their emission and excitation spectra were obtained.Experimental results indicated that the fluorescence lifetimes of complexes 2 and 3 were 0.807 and 0.845 ms,respectively.The emission spectral data of complexes 1-4 were imported into the CIE chromaticity coordinate system,and their corre sponding luminescent regions cover the yellow light,red light,green light,and orange-red light bands,respectively.Within the temperature range of 299.15-1300 K,the thermal decomposition processes of the six complexes were comprehensively analyzed by using TG-DSC/FTIR/MS technology.The hypothesis of the gradual loss of ligand groups during the decomposition process was verified by detecting the escaped gas,3D infrared spectroscopy,and ion fragment information detected by mass spectrometry.The specific decomposition path is as follows:firstly,free ethanol molecules and neutral ligands are removed,and finally,acidic ligands are released;the final product is the corresponding metal oxide.CCDC:2430420,1;2430422,2;2430419,3;2430424,4;2430421,5;2430423,6.展开更多
Magnetic starch particles （MSPs） were synthesized in water-in-oil mieroemulsion at room temperature. MSPs were characterized by transmission electron microscopy （TEM）, Fourier transform infrared spectrometry （FTI...Magnetic starch particles （MSPs） were synthesized in water-in-oil mieroemulsion at room temperature. MSPs were characterized by transmission electron microscopy （TEM）, Fourier transform infrared spectrometry （FTIR）, zeta potential system, thermogravimetric analysis （TGA） and vibrating sample magnetometry （VSM）. The average diameter of the MSPs was 220 nm, dispersed with well-proportioned size and magnetic resonance, the saturation magnetization was 3.64 A.mR/kg. MSP was coated with poly-L-lysine （PLL）, and then the surface of PLL-MSP was combined with fluorescein isothiocynate （FITC）. Results show that fluorescent/magnetic starch particles （FMSPs） are of stable photo-bleaching capability compared with free FITC, with low bio-toxicity and certain function of magnetic separation. It is expected that FMSPs are bifimctional nano-materials including fluorescence labelling and magnetic separation.展开更多
Two novel bis(2-hydroxy-5-R-benzylidene)carbohydrazide dibutyltin complexes(R:Cl(T1),Me(T2))with hexanuclear and triangular frame structures were obtained by microwave-assisted solvothermal reaction of dibutyltin oxid...Two novel bis(2-hydroxy-5-R-benzylidene)carbohydrazide dibutyltin complexes(R:Cl(T1),Me(T2))with hexanuclear and triangular frame structures were obtained by microwave-assisted solvothermal reaction of dibutyltin oxide precursor with the ligands in methanol environments,However,their structures are characterized by elemental analysis,IR,(1H,13C)NMR spectra,and the molecular structures of T1 and T2 were confirmed by X-ray diffraction.The crystal of T1 belongs to triclinic system,space group P1,and T2 is of monoclinic system,space group C2/c.Five-coordinated distorted triangular bipyramids and six-coordinated distorted octahedral configurations were formed by the coordination of oxygen and nitrogen atoms of ligands with two dibutyltins,respectively,and trimer hexanuclear dibutyltin complexes were constructed by the cross-coordination of enol imines.The two complexes exhibit fluorescence emission in DMF solvents and DMF-water mixtures.When the volume fraction of water content is between 0 and 10%(V/V),the aggregation fluorescence enhancement effect is good,and fluorescence quenching occurs when the water content is more than 10%(V/V).The T1 can inhibit the growth of target plants,such as Portulaca oleracea,Cassia tora L.,Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee and Amaranthus tricolor L.The T2 can selectively inhibit the growth of Portulaca oleracea L.,Amaranthus spinosus L.and Amaranthus tricolor L.It can be used as a candidate herbicide for Portulaca oleracea L.,Amaranthus spinosus L.and Amaranthus tricolor L.展开更多
A series of fluorescent siloxane-polyurethanes（HPMS-PUs） containing an amino-functionalized,1 8-naphthalimide,fluorescent monomer（AABD） as a chain extender were synthesized.The properties of the HPMS-PUs were inve...A series of fluorescent siloxane-polyurethanes（HPMS-PUs） containing an amino-functionalized,1 8-naphthalimide,fluorescent monomer（AABD） as a chain extender were synthesized.The properties of the HPMS-PUs were investigated by UV–vis and fluorescence spectroscopies,thermogravimetric analysis and thermal migration behavior.The maximum absorption and emission wavelengths of HPMS-PUs showed a red shift of about 4 nm and a blue shift of about 9 nm,respectively,compared to those of AABD.The Stokes shifts of AABD and HPMS-PU2 were 3514 and 2931 cm 1,respectively.The quantum yield of HPMS-PU2 was 0.79,which was six times higher than that of AABD.Concentration self-quenching was observed in both AABD and HPMS-PUs.The fluorescence of HPMS-PUs was quite stable with respect to both temperature and fluorescence quencher effects.The thermal stability of HPMS-PUs increased with AABD content.The fluorophore units in the HPMS-PUs did not readily migrate.展开更多
A new complex has been synthesized with o-methylbenzoyl-benzoic acid（HL） and 1,10-phenanthroline（phen） in the mixture of water and ethanol. It crystallizes in monoclinic, space group C2/c with a = 13.6328（18）, b...A new complex has been synthesized with o-methylbenzoyl-benzoic acid（HL） and 1,10-phenanthroline（phen） in the mixture of water and ethanol. It crystallizes in monoclinic, space group C2/c with a = 13.6328（18）, b = 17.7876（18）, c = 19.998（2）, β = 104.720（4）o, C54H48N4O11Zn, Mr = 994.33, V = 4690.2（9）3, Dc = 1.408 g/cm3, Z = 4, F（000） = 2072, μ（MoKα） = 0.59 mm-1, R = 0.0736 and wR = 0.2029. The crystal structure shows that the zinc ions are coordinated with two oxygen atoms from two HL molecules and four nitrogen atoms from two phen molecules, forming distorted octahedral coordination geometry. The fluorescent and thermal stability properties of the complex are studied. The result shows that it has one fluorescent emission band at around 412 nm. In addition, the complex is stable under 210 ℃.展开更多
A new terbium(Ⅲ complex Tb(C20H14O3N)3(C12H8N2)（H2O）·H2O has been synthesized with 2-diphenylanine carbonyl benzoic acid and 1,10-phenanthroline as ligands. Crystal data for the complex are as follows: triclin...A new terbium(Ⅲ complex Tb(C20H14O3N)3(C12H8N2)（H2O）·H2O has been synthesized with 2-diphenylanine carbonyl benzoic acid and 1,10-phenanthroline as ligands. Crystal data for the complex are as follows: triclinic, space group P1, a =11.6034（6）, b = 16.2465（8）, c = 16.4427（8） ?, α = 73.168（5）o, β = 88.655（4）o, γ = 82.865（4）o, V = 2943.7（3） ?3, Dc = 1.494 g/cm3, Z = 2, μ（MoK α） = 1.272 mm-1, F（000） = 1348, the final R = 0.0535 and w R = 0.0809. The Tb（Ⅲ） ion is coordinated by nine atoms to give a monocapped square antiprism coordination geometry. The complex shows four fluorescence emission bands arising from the transitions of Tb3+: 5D4 → 7F6（491 nm）, 5D4 → 7F5（546 nm）, 5D4 → 7F4（585 nm） and 5D4→7F3（621 nm）. Also reported are the magnetic and thermal stability properties of the complex.展开更多
A novel silver（I） complex [Ag（2,2ˊ-bipy）（C14H9O3）]·（C14H10O3） has been synthesized with 2-benzoylbenzoic acid as the ligand. Crystal data for the title complex： monoclinic, space group Cc, a = 27.4089...A novel silver（I） complex [Ag（2,2ˊ-bipy）（C14H9O3）]·（C14H10O3） has been synthesized with 2-benzoylbenzoic acid as the ligand. Crystal data for the title complex： monoclinic, space group Cc, a = 27.4089（13）, b = 10.2897（5）, c = 12.0024（6）A, β = 111.864（4）°, Mr = 715.49, V = 3141.5（3） A3, Dc = 1.513 g/cm^3, Z = 4, μ（Mo Kα） = 0.694 mm^-1, F（000） = 1456, the final R = 0.0473 and w R = 0.1146. In the title complex, the central Ag（I） ion is located in a triangular coordination environment. The electron transfer is quasi-reversible in the electrode reaction and it shows a strong emission peak in the range of 495-520 nm under 502 nm excitation. In addition, it displays diamagnetic property from 3 to 300 K.展开更多
A new cadmium(II) complex Cd(OBBA)2(2,2A-bipy)2 with 2-benzoylbenzoic acid(HOBBA) and 2,2-bipyridine(2,2A-bipy) as ligands has been synthesized. Crystal data for the complex are as follows: monoclinic, space group P21...A new cadmium(II) complex Cd(OBBA)2(2,2A-bipy)2 with 2-benzoylbenzoic acid(HOBBA) and 2,2-bipyridine(2,2A-bipy) as ligands has been synthesized. Crystal data for the complex are as follows: monoclinic, space group P21/c with a = 16.402(3), b = 10.4191(18), c = 23.395(4) A, β = 91.765(2)o, V = 3996.2(12) A3, Dc = 1.455 gAcm-3, Z = 4, μ(Mo Kα) = 0.603 mm-1, F(000) = 1784, the final R = 0.0218 and w R = 0.0558. In the electrode reaction, its electron transfer is quasi reversible and the electrode reaction corresponds to Cd(II)/Cd(0). Under 618 nm radiation, the title complex shows a strong fluorescent band at around 326 nm. In addition, in the range of 2~300 K, this complex displays diamagnetic property.展开更多
Lake Baiyangdian is one of China’s largest macrophyte-derived lakes,facing severe challenges related to water quality maintenance and eutrophication prevention.Dissolved organic matter(DOM)was a huge carbon pool and ...Lake Baiyangdian is one of China’s largest macrophyte-derived lakes,facing severe challenges related to water quality maintenance and eutrophication prevention.Dissolved organic matter(DOM)was a huge carbon pool and its abundance,property,and transformation played important roles in the biogeochemical cycle and energy flow in lake ecosystems.In this study,Lake Baiyangdian was divided into four distinct areas:Unartificial Area(UA),Village Area(VA),Tourism Area(TA),and Breeding Area(BA).We examined the diversity of DOM properties and sources across these functional areas.Our findings reveal that DOM in this lake is predominantly composed of protein-like substances,as determined by excitation-emission matrix and parallel factor analysis(EEM-PARAFAC).Notably,the exogenous tyrosine-like component C1 showed a stronger presence in VA and BA compared to UA and TA.Ultrahigh-resolution mass spectrometry(FT-ICR MS)unveiled a similar DOM molecular composition pattern across different functional areas due to the high relative abundances of lignan compounds,suggesting that macrophytes significantly influence the material structure of DOM.DOM properties exhibited specific associations with water quality indicators in various functional areas,as indicated by the Mantel test.The connections between DOM properties and NO_(3)-N andNH3-Nwere more pronounced in VA and BA than in UA and TA.Our results underscore the viability of using DOM as an indicator for more precise and scientific water quality management.展开更多
基金Project supported by Research Foundation of the General Armament Department (2008CD012)
文摘Terpyridine-capped poly（ethylene glycol） （PEG） was synthesized as a novel polymeric ligand and rare earth complex was prepared from Eu（NO3）3 and the telechelic macromolecules. The structure of the complex was characterized by 1H NMR, FT-IR, UV-vis and fluores-cence spectroscopy. Strong fluorescent emission of the complex was observed at 593 and 616 nm upon the excitation of 300 nm. The fluo-rescent emission was quenched upon addition of trace amount of diethyl chlorophosphate （DCP）. And the observed Ksv values for DCP were measured to be 0.568×10^3 and 0.89×10^3 L/mol for quenching at 593 and 616 nm, which indicated the detection limit for DCP was about 0.014 mmol/L. These results showed that the terpyridine-lanthanide complex could be an effective chemosensor with a potential application in the detection of organophosphates.
基金Fund of Science and Technology Committee of Hunan Province(No.2012GK3030)Scientific Research Fund of Hunan Provincial Education Department(No.11C0186)+1 种基金Hengyang Bureau of Science and Technology(No.2011kG28)the Key Discipline Project of Hunan Province
文摘A new Cd（II） complex [Cd（C12H6OaN2）（Phen）ffH2O）]＇3H2O with 2,2＂-bipyridine- 3,3＂-dicarboxylic acid as a ligand has been synthesized. Crystal data for the title complex are as follows： monoclinic, space group P2dn, a = 12.8458（5）, b = 17.9131（7）, c = 15.2960（6） A, β = 111.7430（10）°, V = 3269.3（2） A3, Dc = 1.581 g/cm3, Z = 4,/a（MoKa） = 0.731 mm-1, F（000） = 1580, the R = 0.0244 and wR = 0.0605. In the title complex, the central Cd（ll） ion is located in a distorted octahedral coordination environment. The electrochemical and fluorescent properties of the title complex were studied. The results show that the electron transfer of the title complex is irreversible in the electrode reaction and it has a broad emission peak in the range of 470-508 nm with the excitation wavelength of 488 nm.
基金Project(51202066)supported by the National Natural Science Foundation of ChinaProject(NCET-13-0784)supported by the Program for New Century Excellent Talents of the Education Ministry,China。
文摘Tetragonal structural(t-NdVO4)nanorod-arrays were fabricated by simple one-pot hydrothermal method.The phase,morphology and microstructure of NdVO4 were characterized by X-ray diffractometer,scanning electron microscope(SEM),transmission electron microscope(TEM),dispersive X-ray spectrometer(EDS)and selected area electron diffraction(SAED)techniques.t-NdVO4 nanorods are single-crystalline with a length of 100 nm and a diameter of 25 nm,which grow orientally along the direction of(112)crystalline plane and self-assemble to form nanorod-arrays.The results show that Eu^3+-doping interrupts the formation of NdVO4 nanorod-arrays,and then leads to the red-shift of the strongest luminescence emission of Nd3+transition from 4D3/2 state to 4I11/2 and decreases its intensity of the fluorescence emission at 400 nm sharply.The research results have some reference values to optimize the photoluminescence performance of rare earth vanadates.
基金Supported by the Fund of Science and Technology Committee of Hunan Province(No.2012GK3030)Scientific Research Fund of Hunan Provincial Education Department(No.11C0186)Key Project of Science and Technology Plan of Hunan Province(2012FJ2002)
文摘A new copper（II） complex Cu2（L）a（2,2＇-bipy）2（H2O）2 （1） has been synthesized with 2-benzoylbenzoic acid （HL） and 2,2＇-bipyridin as ligands. The crystal belongs to a monoclinic system with space group Cc, a = 13.9979（II）, b = 15.9888（13）, c = 30.306（3） A, β = 100.8700（10）°, V= 6661.1（10） A3, Dc= 1.372 g/cm3, Z = 8, F（000） = 2840, the final GOOF = 1.018, R= 0.0685, and wR= 0.1731. There are two mononuclear Cu（L）2（2,2＇-bipy）（H20） units in the crystal of 1. Each Cu（II） cation is coordinated by five atoms. The magnetic and fluorescent properties of 1 were studied. The results show that 1 exhibits weak paramagnetism, and when the excitation wavelength is at 616 nm, it has an intense fluorescent emission band around 482 nm.
基金supported by the National Natural Science Foundation of China (No. 31170539)
文摘Two dehydroabietic acid-based arylamines have been synthesized and characterized by FTIR, 1H NMR, 13C NMR, MS spectra and elemental analysis. Their spatial structures were determined by X-ray diffraction analysis. UV-Vis absorption and fluorescence spectral characteristics of these compounds in methanol were investigated. Their fluorescence emission spectra in different polarity solvents were further evaluated. Fluorescent properties and structural relationship of the compounds showed that fluorescence intensity and quantum yield inversely increase with the non-coplanar degree. In addition, the solvent polarity has different effects on the fluorescence emission spectra of two compounds.
基金supported by the National Natural Science Foundation of China(21503183,21663031,21373189)the provincial level innovation programs funds of undergraduate for 2017(1573)
文摘Two coordination polymers（CPs）,{[Ag（ADA）（0.5）（DPE）]·H2O}n（1） and {[Ag（ADA）（0.5）（Bipy）（0.5）]·H2O}n（2）,（H2ADA = 3,3-azodibenzoic acid,DPE = 1,2-di（4-pyridyl）-ethylene,Bipy = 4,4？-bipyridine）,have been synthesized via solvothermal reactions of Ag＋ with ADA^2- and/or DPE,Bipy.CPs 1 and 2 were characterized by elemental analyses,IR spectra,thermal behaviors,and X-ray single-crystal diffraction.CPs 1 and 2 feature ＂Ag···Ag＂ subunits.CP 1 shows a 3D construction,in which the ＂Ag···Ag＂ subunits extend through ADA^2- and DPE ligands using μ6-kO,O;kO;kO;kO,O;kO;kO and μ2-kO;kO coordination modes,respectively.It crystallizes in triclinic system,space group P1,with a = 0.3808（18）,b = 1.2476（6）,c = 1.309（6） nm,α = 76.757（5）,β = 84.649（5）,γ = 86.809（5）o,V = 0.6024（5） nm^3,Z = 2,Mr = 351.11,C（13）H（11）AgN2O3,Dc = 1.936 g/cm3,F（000） = 348,S = 1.064,R = 0.0323 and w R = 0.0689.CP 2 exhibits a 3 D supramolecular structure,in which the ＂Ag···Ag＂ subunits are connected by ADA^2- and DPE ligands with μ6-kO;kO;kO,O;kO;kO and μ2-kO;kO coordination modes,respectively.Ultimately,through hydrogen bond and π···π interaction,the ＂Ag···Ag＂ subunits stabilize the 3D supramolecular structure of 2.It crystallizes in monoclinic,space group C2/c,with a = 25.301（15）,b = 13.197（8）,c = 6.970（4） nm,β = 102.597（7）o,V = 2.271（2） nm^3,Z = 8,C（12）H（10）AgN2O（2.50）,Mr = 330.09,Dc = 1.931 g/cm^3,F（000） = 1304,S = 1.082,R = 0.1107 and wR = 0.2984.The fluorescence properties of CPs 1 and 2 have been also investigated.
基金the Development Programof Science &Technology of Tianjin ,China (06TXTJJC14400)
文摘We synthesized a series of rare earth complexes with benzoic acid ramification containing different substitute groups or the same substitute group in different position; test the fluorescence property using fluorescence spectrometer of the complexes, and discussed the influence of different substitute group and the position of substitute group on the fluorescent properties of the rare earth complexes. The results showed that different substitute group and the position of substitute group on the benzene ring had important influence on the fluorescent properties of the benzoic acid rare earth complexes, when the other conditions were the same. The fluorescence effect of para-position ligand was better than ortho-position and meta-position ligand. For the benzoic acid complexes, their fluorescence intensity has relationship with the excellent absorption coefficient of the ligand and the high efficient ligand-to-trivalent rare earth ion energy transfer. Furthermore, when the ratio of Ln3+, ligand, phen was 1∶3∶1, the fluorescence properties of rare earth complex was the best.
文摘A new type of binuclear europlum β-diketone chelates Eum Y1-m(TTA)3 phen (0≤m≤1) and the influence of the proportion of Y on fluorescence intensity of the Eu-complexes were studied. It was found the proportion of Y3+ could affect the fluorescence properties and the film formation seriously. only m≥0.5.Y3+ could increase the luminescent intensity and improve the film formalion. As a resull. three new binuclear europium β-diketone chelales consisted of Eu, Y1-m (TTA)3phen (m=0.9. 0.7 and 0.5) were designed and synthesized. Their structures were elucidated by IR. UV. DSC and Elementary Analysis. Their PL properties were studied. The results showed that the three binuclear europium β-diketone chelates had better PL properties and film formation than Eu(TYA)3phen. They could emit sharply red light, and fluorescenl wavelength of them was all at 613nm (half bandwidth 10nm). They can be used as red organic electroluminescent materials (OELMs) in organic electrolminescent devices (OELDS).
基金This work was supported by the Elite Foundation of Educational Department of Guangdong Province (No. 02047).
文摘By using a two-stage soapless emulsion polymerization, four kinds of core-shell nanoparticles have been prepared,which are composed of a polystyrene core having an average diameter of 256 nm and a poly(methyl methacrylate-co-acrylicacid) shell. The transmission electron microscopy (TEM) micrographs and the atomic force microscopy (AFM) imagesevidenced the presence of a core-shell structure. In the infrared spectra, the shift of v_(COOH) to lower wavenumber withincreasing Eu^(3+) ion content indicates that coordination between the oxygen of the carboxylic group and Eu^(3+) has occurred.The fluorescence intensity of ~5D_0-~7F_2 transition was observed to reach its maximum with a carboxyl group molar percentageof 40% in the shell and an Eu^(3+)/--COO^- molar ratio of 1:3. The fluorescence intensity ratio of ~5D_0-~7F_2 to ~5D_0-~7F_1 transition reached its maximum with an Eu^(3+)/--COO^- molar ratio of 1:3 for all the four series.
文摘Herein,antibacterial silver‑doped fluorescent carbon dots(Ag‑CDs)were synthesized through a stepwise hydrothermal method,with polyethyleneimine(PEI),citric acid(CA),and silver nitrate(AgNO3)serving as precursors.The applicability and antimicrobial efficacy of these nanomaterials were systematically investigated for metal ion sensing.Experimental evidence demonstrated that the Ag‑CDs exhibited a pronounced fluorescence quenching response toward ferric ions(Fe^(3+)),enabling their quantitative determination via a linear concentration‑dependent relationship.These Ag‑CDs exhibited significant inhibitory effects on biofilm growth and disruption for both Escherichia coli and Staphylococcus aureus.Mechanism investigations indicate that Ag‑CDs induced the death of Escherichia coli and Pseudomonas aeruginosa by disrupting their bacterial morphology and structure,triggering the generation of intracellular reactive oxygen species(ROS),and impairing their antioxidant defense system.
文摘Six new lanthanide complexes:[Ln(3,4-DEOBA)3(4,4'-DM-2,2'-bipy)]2·2C_(2)H_(5)OH,[Ln=Dy(1),Eu(2),Tb(3),Sm(4),Ho(5),Gd(6);3,4-DEOBA-=3,4-diethoxybenzoate,4,4'-DM-2,2'-bipy=4,4'-dimethyl-2,2'-bipyridine]were successfully synthesized by the volatilization of the solution at room temperature.The crystal structures of six complexes were determined by single-crystal X-ray diffraction technology.The results showed that the complexes all have a binuclear structure,and the structures contain free ethanol molecules.Moreover,the coordination number of the central metal of each structural unit is eight.Adjacent structural units interact with each other through hydrogen bonds and further expand to form 1D chain-like and 2D planar structures.After conducting a systematic study on the luminescence properties of complexes 1-4,their emission and excitation spectra were obtained.Experimental results indicated that the fluorescence lifetimes of complexes 2 and 3 were 0.807 and 0.845 ms,respectively.The emission spectral data of complexes 1-4 were imported into the CIE chromaticity coordinate system,and their corre sponding luminescent regions cover the yellow light,red light,green light,and orange-red light bands,respectively.Within the temperature range of 299.15-1300 K,the thermal decomposition processes of the six complexes were comprehensively analyzed by using TG-DSC/FTIR/MS technology.The hypothesis of the gradual loss of ligand groups during the decomposition process was verified by detecting the escaped gas,3D infrared spectroscopy,and ion fragment information detected by mass spectrometry.The specific decomposition path is as follows:firstly,free ethanol molecules and neutral ligands are removed,and finally,acidic ligands are released;the final product is the corresponding metal oxide.CCDC:2430420,1;2430422,2;2430419,3;2430424,4;2430421,5;2430423,6.
基金Project(200501) supported by the "985" Program of China
文摘Magnetic starch particles （MSPs） were synthesized in water-in-oil mieroemulsion at room temperature. MSPs were characterized by transmission electron microscopy （TEM）, Fourier transform infrared spectrometry （FTIR）, zeta potential system, thermogravimetric analysis （TGA） and vibrating sample magnetometry （VSM）. The average diameter of the MSPs was 220 nm, dispersed with well-proportioned size and magnetic resonance, the saturation magnetization was 3.64 A.mR/kg. MSP was coated with poly-L-lysine （PLL）, and then the surface of PLL-MSP was combined with fluorescein isothiocynate （FITC）. Results show that fluorescent/magnetic starch particles （FMSPs） are of stable photo-bleaching capability compared with free FITC, with low bio-toxicity and certain function of magnetic separation. It is expected that FMSPs are bifimctional nano-materials including fluorescence labelling and magnetic separation.
基金Supported by the Innovation Platform Open Foundation for Colleges and Universities of Hunan Province(No.16k011)the Foundation of Key Laboratory of Functional Metal-organic Compounds of Hunan Province。
文摘Two novel bis(2-hydroxy-5-R-benzylidene)carbohydrazide dibutyltin complexes(R:Cl(T1),Me(T2))with hexanuclear and triangular frame structures were obtained by microwave-assisted solvothermal reaction of dibutyltin oxide precursor with the ligands in methanol environments,However,their structures are characterized by elemental analysis,IR,(1H,13C)NMR spectra,and the molecular structures of T1 and T2 were confirmed by X-ray diffraction.The crystal of T1 belongs to triclinic system,space group P1,and T2 is of monoclinic system,space group C2/c.Five-coordinated distorted triangular bipyramids and six-coordinated distorted octahedral configurations were formed by the coordination of oxygen and nitrogen atoms of ligands with two dibutyltins,respectively,and trimer hexanuclear dibutyltin complexes were constructed by the cross-coordination of enol imines.The two complexes exhibit fluorescence emission in DMF solvents and DMF-water mixtures.When the volume fraction of water content is between 0 and 10%(V/V),the aggregation fluorescence enhancement effect is good,and fluorescence quenching occurs when the water content is more than 10%(V/V).The T1 can inhibit the growth of target plants,such as Portulaca oleracea,Cassia tora L.,Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee and Amaranthus tricolor L.The T2 can selectively inhibit the growth of Portulaca oleracea L.,Amaranthus spinosus L.and Amaranthus tricolor L.It can be used as a candidate herbicide for Portulaca oleracea L.,Amaranthus spinosus L.and Amaranthus tricolor L.
基金Financial support from the 863 program (No. 2011AA02A204)
文摘A series of fluorescent siloxane-polyurethanes（HPMS-PUs） containing an amino-functionalized,1 8-naphthalimide,fluorescent monomer（AABD） as a chain extender were synthesized.The properties of the HPMS-PUs were investigated by UV–vis and fluorescence spectroscopies,thermogravimetric analysis and thermal migration behavior.The maximum absorption and emission wavelengths of HPMS-PUs showed a red shift of about 4 nm and a blue shift of about 9 nm,respectively,compared to those of AABD.The Stokes shifts of AABD and HPMS-PU2 were 3514 and 2931 cm 1,respectively.The quantum yield of HPMS-PU2 was 0.79,which was six times higher than that of AABD.Concentration self-quenching was observed in both AABD and HPMS-PUs.The fluorescence of HPMS-PUs was quite stable with respect to both temperature and fluorescence quencher effects.The thermal stability of HPMS-PUs increased with AABD content.The fluorophore units in the HPMS-PUs did not readily migrate.
基金Supported by the Natural Science Foundation of Hunan Province(No.11JJ9006)Key Project of Science and Technology Plan of Hunan Province(2012FJ2002)the Construct Program of the Key Discipline in Hunan Province
文摘A new complex has been synthesized with o-methylbenzoyl-benzoic acid（HL） and 1,10-phenanthroline（phen） in the mixture of water and ethanol. It crystallizes in monoclinic, space group C2/c with a = 13.6328（18）, b = 17.7876（18）, c = 19.998（2）, β = 104.720（4）o, C54H48N4O11Zn, Mr = 994.33, V = 4690.2（9）3, Dc = 1.408 g/cm3, Z = 4, F（000） = 2072, μ（MoKα） = 0.59 mm-1, R = 0.0736 and wR = 0.2029. The crystal structure shows that the zinc ions are coordinated with two oxygen atoms from two HL molecules and four nitrogen atoms from two phen molecules, forming distorted octahedral coordination geometry. The fluorescent and thermal stability properties of the complex are studied. The result shows that it has one fluorescent emission band at around 412 nm. In addition, the complex is stable under 210 ℃.
基金supported by the cooperative project of Hengyang Normal University with Hengyang Yile New Materials Co.,Ltd.(HXKJ201905)the Natural Science Foundation of Hunan Province(2019JJ60021,2019JJ50013)+1 种基金the Scientific Research Found of Hunan Provincial Education Department of China(17A049)the Industry and Research Key Project of Hengyang City(2018k KJ016,2017KJ155,2017KJ193)
文摘A new terbium(Ⅲ complex Tb(C20H14O3N)3(C12H8N2)（H2O）·H2O has been synthesized with 2-diphenylanine carbonyl benzoic acid and 1,10-phenanthroline as ligands. Crystal data for the complex are as follows: triclinic, space group P1, a =11.6034（6）, b = 16.2465（8）, c = 16.4427（8） ?, α = 73.168（5）o, β = 88.655（4）o, γ = 82.865（4）o, V = 2943.7（3） ?3, Dc = 1.494 g/cm3, Z = 2, μ（MoK α） = 1.272 mm-1, F（000） = 1348, the final R = 0.0535 and w R = 0.0809. The Tb（Ⅲ） ion is coordinated by nine atoms to give a monocapped square antiprism coordination geometry. The complex shows four fluorescence emission bands arising from the transitions of Tb3+: 5D4 → 7F6（491 nm）, 5D4 → 7F5（546 nm）, 5D4 → 7F4（585 nm） and 5D4→7F3（621 nm）. Also reported are the magnetic and thermal stability properties of the complex.
基金Supported by the Natural Science Foundation of Hunan Province(No.11JJ9006)Key Project of Science and Technology Plan of Hunan Province(2012FJ2002)the Construct Program of the Key Discipline in Hunan Province
文摘A novel silver（I） complex [Ag（2,2ˊ-bipy）（C14H9O3）]·（C14H10O3） has been synthesized with 2-benzoylbenzoic acid as the ligand. Crystal data for the title complex： monoclinic, space group Cc, a = 27.4089（13）, b = 10.2897（5）, c = 12.0024（6）A, β = 111.864（4）°, Mr = 715.49, V = 3141.5（3） A3, Dc = 1.513 g/cm^3, Z = 4, μ（Mo Kα） = 0.694 mm^-1, F（000） = 1456, the final R = 0.0473 and w R = 0.1146. In the title complex, the central Ag（I） ion is located in a triangular coordination environment. The electron transfer is quasi-reversible in the electrode reaction and it shows a strong emission peak in the range of 495-520 nm under 502 nm excitation. In addition, it displays diamagnetic property from 3 to 300 K.
基金Supported by the Scientific Research Fund of Hunan Provincial Education Department(No.11C0186)the Construct Program of the Key Discipline in Hunan Province
文摘A new cadmium(II) complex Cd(OBBA)2(2,2A-bipy)2 with 2-benzoylbenzoic acid(HOBBA) and 2,2-bipyridine(2,2A-bipy) as ligands has been synthesized. Crystal data for the complex are as follows: monoclinic, space group P21/c with a = 16.402(3), b = 10.4191(18), c = 23.395(4) A, β = 91.765(2)o, V = 3996.2(12) A3, Dc = 1.455 gAcm-3, Z = 4, μ(Mo Kα) = 0.603 mm-1, F(000) = 1784, the final R = 0.0218 and w R = 0.0558. In the electrode reaction, its electron transfer is quasi reversible and the electrode reaction corresponds to Cd(II)/Cd(0). Under 618 nm radiation, the title complex shows a strong fluorescent band at around 326 nm. In addition, in the range of 2~300 K, this complex displays diamagnetic property.
基金supported by the National Key Research and Development Program of China(No.2022YFC3204000).
文摘Lake Baiyangdian is one of China’s largest macrophyte-derived lakes,facing severe challenges related to water quality maintenance and eutrophication prevention.Dissolved organic matter(DOM)was a huge carbon pool and its abundance,property,and transformation played important roles in the biogeochemical cycle and energy flow in lake ecosystems.In this study,Lake Baiyangdian was divided into four distinct areas:Unartificial Area(UA),Village Area(VA),Tourism Area(TA),and Breeding Area(BA).We examined the diversity of DOM properties and sources across these functional areas.Our findings reveal that DOM in this lake is predominantly composed of protein-like substances,as determined by excitation-emission matrix and parallel factor analysis(EEM-PARAFAC).Notably,the exogenous tyrosine-like component C1 showed a stronger presence in VA and BA compared to UA and TA.Ultrahigh-resolution mass spectrometry(FT-ICR MS)unveiled a similar DOM molecular composition pattern across different functional areas due to the high relative abundances of lignan compounds,suggesting that macrophytes significantly influence the material structure of DOM.DOM properties exhibited specific associations with water quality indicators in various functional areas,as indicated by the Mantel test.The connections between DOM properties and NO_(3)-N andNH3-Nwere more pronounced in VA and BA than in UA and TA.Our results underscore the viability of using DOM as an indicator for more precise and scientific water quality management.
