Europium complexes are widely used as immunomarkers for lateral flow immunoassay(LFIA)because of their long luminescent lifetime,large Stokes shift,and high luminous color purity.However,most europium co mplexes exhib...Europium complexes are widely used as immunomarkers for lateral flow immunoassay(LFIA)because of their long luminescent lifetime,large Stokes shift,and high luminous color purity.However,most europium co mplexes exhibit inadequate stability in co mplex environments,and their fluorescence is readily quenched in an aqueous phase,thereby compromising the detection sensitivity and accuracy of LFIA,Herein,to ove rcome this challenge,we synthesized a polydentate europium complex,Eu(TTA)_(3)[Phen(PO-8)_(2)],characterized by robust stability.Finally,Eu(TTA)_(3)[Phen(PO-8)_(2)]was employed to fabricate polystyrene(PS)fluorescent microsphere s for LFIA,demonstrating remarrkable sensitivity and selectivity detecting serum amyloid A(SAA)at conce ntration as high as 220μg/mL,with a detection limit of 0.5μg/mL.More importantly,the SAA testing strips exhibit excellent long-term storage stability.Such stable polydentate europium complexes are anticipated to supplant existing commercial europium complexes,becoming a staple in LFIA applications.展开更多
Three Eu（III） ternary complexes, Eu（hfa-H）3（Phen）, Eu（hfa-H）3（Bipy） and Eu（hfa-H）3（Bath） （hfa = hexafluoroacetylacetonate, Phen = 1,10-phenanthroline, Bipy = 2,2＇-bipyridine, Bath = bathophenanthroline...Three Eu（III） ternary complexes, Eu（hfa-H）3（Phen）, Eu（hfa-H）3（Bipy） and Eu（hfa-H）3（Bath） （hfa = hexafluoroacetylacetonate, Phen = 1,10-phenanthroline, Bipy = 2,2＇-bipyridine, Bath = bathophenanthroline）, were synthesized. Their luminescent properties were studied by incorporating deuterated Eu（III） complexes in a poly（methylmethacrylate） （PMMA） matrix, and the results indicated that luminescent PMMA including Eu（hfa-D）3（Bath） showed promising results for applications to novel organic Eu（III） devices, such as the high-power laser materials. Additionally, all the three Eu（III） complexes exhibited good thermostabilization.展开更多
The thermal decomposition reaction of Eu-2(p-MBA)(6)(PHEN)(2) (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition pro...The thermal decomposition reaction of Eu-2(p-MBA)(6)(PHEN)(2) (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition process of the complex was determined and its kinetics was investigated. Kinetic parameters were obtained from the analysis of TG-DTG curves by means of the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: f(alpha) =(1-alpha)(2), g(alpha) = (1-alpha)(-1)-1. The activation energy for the first stage is 255.18 kJ/mol, the entropy of activation DeltaS is 227.32 J/mol and the Gibbs free energy of activation DeltaG is 128.04 W/mol.展开更多
Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2(NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo ...Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2(NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,DBM= dibenzoylmethanato) were successfully synthesized and characterized by IR and elemental analysis.The UV-vis absorption spectra and pho-toluminescence properties of the complexes were investigated,and the irradiation at the absorption band between 300-400 nm of europium complexes either in solution or in the solid state led to the emission of a sharp red band at;10 nm,a characteristic Eu3+ emission due to the transition of 5D0→7F2.Furthermore,the weak emission bands around 587 and 595 nm attributed to 5D0→7F0 and 5D0→7F1 transition were also displayed in the emission spectra.These results demonstrated that the Eu（III） ion was sensitized efficiently by the ligand and displayed photoluminescence with high intensity,narrow half-peak width,and monochromic light.The excited-state lifetimes of 1 and 2 were in the microsecond time scale,but the photoluminescence quantum yield of 2（0.03） was two times higher than that of 1（0.01） which should be at-tributed to the effect of the ethyl substituting in ENIP.展开更多
The 1,3,5-triazine diphosphine oxide ligands with donor-acceptor properties formed strong complexes with europium（Ⅲ） ion in acetonitrile. Spectrophotometric titrations and mass spectra indicated that two ligands co...The 1,3,5-triazine diphosphine oxide ligands with donor-acceptor properties formed strong complexes with europium（Ⅲ） ion in acetonitrile. Spectrophotometric titrations and mass spectra indicated that two ligands coordinated to one europium ion. The stability constants varied from 11.64 to 14.60 （log 13）. Binary complexes exhibited rather weak luminescence in solution. 1,3,5-triazine diphosphine oxides engaged as co-ligands in Eu（Ⅲ） （2-thenoyltrifluoroacetonate）3 complex contributed to the overall photoluminescence and allowed for excitation with longer wavelengths than the parent complex.展开更多
A new Eu（Ⅲ） complex, {[Eu（tta）2（C2H5OH）（NO3）]2（bmp）}·bmp（tta = 2-thenoyltrifluoro- acetonate, bmp = 2,2＇-bipyrimidine）, has been synthesized and characterized by elemental analysis, IR, luminescence...A new Eu（Ⅲ） complex, {[Eu（tta）2（C2H5OH）（NO3）]2（bmp）}·bmp（tta = 2-thenoyltrifluoro- acetonate, bmp = 2,2＇-bipyrimidine）, has been synthesized and characterized by elemental analysis, IR, luminescence and single-crystal X-ray diffraction analysis. The complex crystallizes in the monoclinic P21/n space group, with a = 11.894（6）, b = 14.235（8）, c = 19.078（10） A, β = 103.423（9）°, V = 3142（3） A3, Z = 2, Mr = 1721.10, Dc = 1.819 g/cm^3, F（000） = 1696, the final R = 0.0452 and wR = 0.1398 for 5375 observed reflections with I 〉 2σ（I）. In the complex, each Eu（Ⅲ） ion is coordinated with four oxygen atoms from two tta ligands and two nitrogen atoms from a bmp ligand, three oxygen atoms from one NO3- anion and one ethanol molecule, forming a distorted tricapped trigonal prism geometry. Luminescence measurement indicates that the europium complex is a strong red emitter in the solid state at room temperature.展开更多
A new aryl amide type tetrapodal ligand L (1, 1, 1, 1 tetrakis-{[(2 benzylaminoformyl) phenoxyl]methyl}methane) and its europium and terbium nitrate complexes were synthesized. The luminescence properties of these c...A new aryl amide type tetrapodal ligand L (1, 1, 1, 1 tetrakis-{[(2 benzylaminoformyl) phenoxyl]methyl}methane) and its europium and terbium nitrate complexes were synthesized. The luminescence properties of these complexes were also studied.展开更多
We had prepared rare earth-functional polymer light-emitting materials using the PPhPA as the ligand with Eu complexation,and introduced the second ligand phenanthroline.Using infrared spectroscopy,fluorescence spectr...We had prepared rare earth-functional polymer light-emitting materials using the PPhPA as the ligand with Eu complexation,and introduced the second ligand phenanthroline.Using infrared spectroscopy,fluorescence spectrophotometer,scanning electron microscopy and X-ray diffraction,we analysed the complexes' structure and performance.PPhPA was a good polymer ligand;Rare earth complexes made of PPhPA with Eu appeared fluorescence characteristic absorption peak of europium at the 612nm;the monochromaticity of complexes was good,and the complexes could emit characteristic fluorescence of rare earth and were crystalline complexes.展开更多
The interaction of complex Eu(bpy)_3 (3+) with DNA was studied by fluorophotometry. The binding constant ( K ) and size ( n ) of the binding site were calculated according to the changes of the fluorescent intensity a...The interaction of complex Eu(bpy)_3 (3+) with DNA was studied by fluorophotometry. The binding constant ( K ) and size ( n ) of the binding site were calculated according to the changes of the fluorescent intensity at the adding process of DNA. The model for the complex Eu(bpy)_3 (3+) interacted with DNA solution is found to be electrostatic action. The system Eu(bpy)_3 (3+)-DNA was studied by the voltammetry. The interaction of the complex Eu(bpy)_3 (3+) with the calf thymus DNA was investigated by fluorophotometry,then K and n were obtained.展开更多
With an aim to develop novel luminescence materials, europium and terbium complexes of 2, 5-(2-thiophene)-pyridine (TPY), 5, 5′-bis(5-(2, 2′-bithiophene))-2, 5-pyridine (B2TPY) and 5, 5′-bis(5-(2, 2′-bithiophene))...With an aim to develop novel luminescence materials, europium and terbium complexes of 2, 5-(2-thiophene)-pyridine (TPY), 5, 5′-bis(5-(2, 2′-bithiophene))-2, 5-pyridine (B2TPY) and 5, 5′-bis(5-(2, 2′-bithiophene))-2, 2′-bipyridine (B2TBPY) were synthesized, and their luminescence properties were studied. The complexes exhibited ligand-sensitized emission, which was typical of Eu(Ⅲ) and Tb(Ⅲ) ions. The excitation spectra of Eu(Ⅲ) and Tb(Ⅲ) complexes with TPY (or B2TPY or B2TBPY) show similar bands as these with the ligands. It suggests that, the excitation energy is absorbed by TPY or B2TPY or B2TBPY, the energy transfers from its excited single state to its triplet state, and finally transfers from the ligands to Eu(Ⅲ) and Tb(Ⅲ) ions. The luminescence of Eu(Ⅲ) and Tb(Ⅲ) ions in the TPY or B2TPY or B2TBPY complexes indicates that the metal ions are efficiently excited by the absorbed energy from excitation of the ligands.展开更多
Series of doped rare earth compiexes-EuxGd(1-x) (CA)3·nH2O (CA = citric acid) were synthesized. Some characterizations were taken for these complexes. The experimental results shows that the doped rare earth comp...Series of doped rare earth compiexes-EuxGd(1-x) (CA)3·nH2O (CA = citric acid) were synthesized. Some characterizations were taken for these complexes. The experimental results shows that the doped rare earth complexes have the best fluorescence property when the ratio of Eu and Gd is from 0.7 to 0.3. Silicon rubber-based composites were prepared by mechanical blending the EuxGd(1-x) (CA)3·nH2O and silicon rubber. Then, the fluorescent property of the composites was studied. It is found that the fluorescence intensity of the composites increase linearly with the contents of the rare earth complexes increasing.展开更多
A novel complex{[Eu（H;TIA）(C;O;);（H;O）;]·H;O};of Eu（Ⅲ）with aromatic carboxylic triazole(H;TIA=5-（4H-1,2,4-triazol-4-yl）isophthalic acid,H;C;O;=oxalic acid)was hydrothermally synthesized and characterized...A novel complex{[Eu（H;TIA）(C;O;);（H;O）;]·H;O};of Eu（Ⅲ）with aromatic carboxylic triazole(H;TIA=5-（4H-1,2,4-triazol-4-yl）isophthalic acid,H;C;O;=oxalic acid)was hydrothermally synthesized and characterized by IR,UV-Vis,emission spectra and optical activity,and its crystal structure was determined.It crystallizes in triclinic system,space group P1 with a=7.4452（13）,b=10.776（2）,c=11.286（2）?,α=110.546（3）°,β=106.604（3）°,γ=99.031（3）°,V=486.0,GOOF=1.096,the final R=0.0196 and w R=0.0527 for 3081 observed reflections with I≥2σ（I）,R=0.0209 and wR=0.0535 for all data with（Δ/σ）;=0.001,（Δρ）;=0.48 and（Δρ）;=–0.46 e·?;.The natural bond orbital（NBO）charges,electrostatic potential（ESP）and frontier orbital of this complex were also analyzed.The results of anti-bacterial activity against Gram positive（S. aureus）and Gram negative（E. coli）bacteria reveal that the studied complex possesses a moderate inhibiting effect,and the inhibition effect on E.coli is better.展开更多
The complex of Eu（IH） with 1-（6-hydroxy- 1-naphthyl）- 1,3-butanedione （HNBD） was prepared for the first time and characterized by elemental analysis, IR, UV, fluorescence spectrum, and DTA-TG-DTG techniques. The...The complex of Eu（IH） with 1-（6-hydroxy- 1-naphthyl）- 1,3-butanedione （HNBD） was prepared for the first time and characterized by elemental analysis, IR, UV, fluorescence spectrum, and DTA-TG-DTG techniques. The IR and UV-visible spectra showed that Eu（Ⅲ） ion was coordinated to the HNBD ligand. The fluorescence spectrum showed the presence of Eu^3＋ characteristic emission. The TG-DTA-DTG curves showed that the thermal decomposition of the anhydrous complex was a two-stage process and the final residue was Eu2O3. The thermal decomposition kinetic parameters of the complex were evaluated from TG-DTG data by using three kinds of integral methods （Coat-Redfem equation, Horowitz and Metzger equation, Madhusudanan-Krishnan-Ninan equation）. The kinetic parameters of the first stage are E^＊ = 164.02 kJ.moll, A = 1.31 × 10^15 s^-l, AS^＊= 42.27 J·K^-l·mol^-l, △H^＊ = 159.51 kJ·mol^-l, △G^＊= 136.54 kJ·mol^-l, and n = 3.1, those of the second stage are E^＊= 128.52 kJ·mol^-l, A = 1.44× 106 s^-1, △S^＊= - 136.89 J·K^-l·mol^-l, △H^＊ = 120.41 kJ·mol^-l, △G^＊= 283.85 kJ·mol^-l, and n = 1.1.展开更多
The complex Eu(IB)_3(phen)·2H_2O was synthesized. The results show that the strong fluorescence emitting of 593 and 615 nm for Eu^(3+) in the Eu(IB)_3(phen) complex is related to the transitions (()~5D_0-()~7F_1)...The complex Eu(IB)_3(phen)·2H_2O was synthesized. The results show that the strong fluorescence emitting of 593 and 615 nm for Eu^(3+) in the Eu(IB)_3(phen) complex is related to the transitions (()~5D_0-()~7F_1) and (()~5D_0-()~7F_2,) respectively. A sensitive method for the determination of adenosine disodium triphosphate (ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(IB)_3(phen). In conditions of pH 6.7 HAc-NaAc buffer, λ_(ex)=273 nm and λ_(em)=615 nm, the linear range of the determination was 0.1～10 μg·ml^(-1) and the detection limit was 0.03 μg·ml^(-1) for ATP. The method has been applied to determine ATP in adenosine disodium triphosphate tablets samples with relative standard deviation of 2.18% and recovery of (98.4%～)104.0%.展开更多
The complex of Eu 3+ and Enoxacin(ENX) and Phen was synthesized. Its compositions is Eu(ENX)_3(phen)Cl_3·2H_2O. Its fluorescence spectra were studied. The results show that the strong fluorescence emitting of 592...The complex of Eu 3+ and Enoxacin(ENX) and Phen was synthesized. Its compositions is Eu(ENX)_3(phen)Cl_3·2H_2O. Its fluorescence spectra were studied. The results show that the strong fluorescence emitting of 592 and 616 nm for Eu 3+ in the Eu(ENX)_3(phen)Cl_3·2H_2O complex is related to the transitions 5D_0-7F_1 and 5D_0-7F_2 respectively. A sensitive method for the determination of adenosine triphosphate(ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(ENX)_3(phen)Cl_3·2H_2O. In conditions of pH 6.7 in HAc-NaAc buffer and λ_ ex=340 nm and λ_ em=616 nm, the linear range of the determination is 0.4～ 10 μg·ml -1 and the detection limit is 0.034 μg·ml -1 for ATP. The method was applied to determine ATP in adenosine disodium triphosphate injection samples with relative standard deviation of 212% and recovery of 94.8%～1037%.展开更多
Ternary complex of Eu （Ⅲ） with 8-hydroxyquinoline （8HOQ） and thenoyhrifluoro-acetone （TTA）, Eu （TTA） （8HOQ）2·H2O was synthesized. The properties and structure of the complex were studied using elementa...Ternary complex of Eu （Ⅲ） with 8-hydroxyquinoline （8HOQ） and thenoyhrifluoro-acetone （TTA）, Eu （TTA） （8HOQ）2·H2O was synthesized. The properties and structure of the complex were studied using elemental analysis, infrared spectra and ultraviolet absorption spectra. The fluorescence characteristics and emission mechanism of the complex were also discussed based on the fluorescence spectra.展开更多
A new ligand, N,N′-Bis(6-methyl-2-pyridine-N-oxide)-1,3-propane (L), and some binary lanthanide complexes (Ln=Eu^(3+), Tb^(3+)) were synthesized and characterized in detail. The composition of the binary complexes wa...A new ligand, N,N′-Bis(6-methyl-2-pyridine-N-oxide)-1,3-propane (L), and some binary lanthanide complexes (Ln=Eu^(3+), Tb^(3+)) were synthesized and characterized in detail. The composition of the binary complexes was determined as LnL(NO_3)_3. They are 1∶1 electrolytes in DMF. The complexes have strong characteristic line fluorescence emission spectra, and it is also found that TbL(NO_3)_3 complex has stronger luminescence intensity than EuL(NO_3)_3 in solid state and in methanol.展开更多
基金Project supported by the National Key R&D Program of China(2022YFF0710000)。
文摘Europium complexes are widely used as immunomarkers for lateral flow immunoassay(LFIA)because of their long luminescent lifetime,large Stokes shift,and high luminous color purity.However,most europium co mplexes exhibit inadequate stability in co mplex environments,and their fluorescence is readily quenched in an aqueous phase,thereby compromising the detection sensitivity and accuracy of LFIA,Herein,to ove rcome this challenge,we synthesized a polydentate europium complex,Eu(TTA)_(3)[Phen(PO-8)_(2)],characterized by robust stability.Finally,Eu(TTA)_(3)[Phen(PO-8)_(2)]was employed to fabricate polystyrene(PS)fluorescent microsphere s for LFIA,demonstrating remarrkable sensitivity and selectivity detecting serum amyloid A(SAA)at conce ntration as high as 220μg/mL,with a detection limit of 0.5μg/mL.More importantly,the SAA testing strips exhibit excellent long-term storage stability.Such stable polydentate europium complexes are anticipated to supplant existing commercial europium complexes,becoming a staple in LFIA applications.
文摘Three Eu（III） ternary complexes, Eu（hfa-H）3（Phen）, Eu（hfa-H）3（Bipy） and Eu（hfa-H）3（Bath） （hfa = hexafluoroacetylacetonate, Phen = 1,10-phenanthroline, Bipy = 2,2＇-bipyridine, Bath = bathophenanthroline）, were synthesized. Their luminescent properties were studied by incorporating deuterated Eu（III） complexes in a poly（methylmethacrylate） （PMMA） matrix, and the results indicated that luminescent PMMA including Eu（hfa-D）3（Bath） showed promising results for applications to novel organic Eu（III） devices, such as the high-power laser materials. Additionally, all the three Eu（III） complexes exhibited good thermostabilization.
基金This project was financially supported by the Education Department of Hebei Province.]
文摘The thermal decomposition reaction of Eu-2(p-MBA)(6)(PHEN)(2) (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition process of the complex was determined and its kinetics was investigated. Kinetic parameters were obtained from the analysis of TG-DTG curves by means of the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: f(alpha) =(1-alpha)(2), g(alpha) = (1-alpha)(-1)-1. The activation energy for the first stage is 255.18 kJ/mol, the entropy of activation DeltaS is 227.32 J/mol and the Gibbs free energy of activation DeltaG is 128.04 W/mol.
基金Project supported by Zhejiang A & F University Science Foundation (2009FR068)the Education Department of Zhejiang Province (Y201119787)
文摘Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2(NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,DBM= dibenzoylmethanato) were successfully synthesized and characterized by IR and elemental analysis.The UV-vis absorption spectra and pho-toluminescence properties of the complexes were investigated,and the irradiation at the absorption band between 300-400 nm of europium complexes either in solution or in the solid state led to the emission of a sharp red band at;10 nm,a characteristic Eu3+ emission due to the transition of 5D0→7F2.Furthermore,the weak emission bands around 587 and 595 nm attributed to 5D0→7F0 and 5D0→7F1 transition were also displayed in the emission spectra.These results demonstrated that the Eu（III） ion was sensitized efficiently by the ligand and displayed photoluminescence with high intensity,narrow half-peak width,and monochromic light.The excited-state lifetimes of 1 and 2 were in the microsecond time scale,but the photoluminescence quantum yield of 2（0.03） was two times higher than that of 1（0.01） which should be at-tributed to the effect of the ethyl substituting in ENIP.
基金support from the Polish Ministry of Science and Higher Education (3T09A 081 28)
文摘The 1,3,5-triazine diphosphine oxide ligands with donor-acceptor properties formed strong complexes with europium（Ⅲ） ion in acetonitrile. Spectrophotometric titrations and mass spectra indicated that two ligands coordinated to one europium ion. The stability constants varied from 11.64 to 14.60 （log 13）. Binary complexes exhibited rather weak luminescence in solution. 1,3,5-triazine diphosphine oxides engaged as co-ligands in Eu（Ⅲ） （2-thenoyltrifluoroacetonate）3 complex contributed to the overall photoluminescence and allowed for excitation with longer wavelengths than the parent complex.
基金Supported by the National Natural Science Foundation of China(21101090)the Natural Science Foundation of Jiangxi Province(20114BAB213001)the Education Department of Jiangxi Province(GJJ12041)
文摘A new Eu（Ⅲ） complex, {[Eu（tta）2（C2H5OH）（NO3）]2（bmp）}·bmp（tta = 2-thenoyltrifluoro- acetonate, bmp = 2,2＇-bipyrimidine）, has been synthesized and characterized by elemental analysis, IR, luminescence and single-crystal X-ray diffraction analysis. The complex crystallizes in the monoclinic P21/n space group, with a = 11.894（6）, b = 14.235（8）, c = 19.078（10） A, β = 103.423（9）°, V = 3142（3） A3, Z = 2, Mr = 1721.10, Dc = 1.819 g/cm^3, F（000） = 1696, the final R = 0.0452 and wR = 0.1398 for 5375 observed reflections with I 〉 2σ（I）. In the complex, each Eu（Ⅲ） ion is coordinated with four oxygen atoms from two tta ligands and two nitrogen atoms from a bmp ligand, three oxygen atoms from one NO3- anion and one ethanol molecule, forming a distorted tricapped trigonal prism geometry. Luminescence measurement indicates that the europium complex is a strong red emitter in the solid state at room temperature.
文摘A new aryl amide type tetrapodal ligand L (1, 1, 1, 1 tetrakis-{[(2 benzylaminoformyl) phenoxyl]methyl}methane) and its europium and terbium nitrate complexes were synthesized. The luminescence properties of these complexes were also studied.
文摘We had prepared rare earth-functional polymer light-emitting materials using the PPhPA as the ligand with Eu complexation,and introduced the second ligand phenanthroline.Using infrared spectroscopy,fluorescence spectrophotometer,scanning electron microscopy and X-ray diffraction,we analysed the complexes' structure and performance.PPhPA was a good polymer ligand;Rare earth complexes made of PPhPA with Eu appeared fluorescence characteristic absorption peak of europium at the 612nm;the monochromaticity of complexes was good,and the complexes could emit characteristic fluorescence of rare earth and were crystalline complexes.
文摘The interaction of complex Eu(bpy)_3 (3+) with DNA was studied by fluorophotometry. The binding constant ( K ) and size ( n ) of the binding site were calculated according to the changes of the fluorescent intensity at the adding process of DNA. The model for the complex Eu(bpy)_3 (3+) interacted with DNA solution is found to be electrostatic action. The system Eu(bpy)_3 (3+)-DNA was studied by the voltammetry. The interaction of the complex Eu(bpy)_3 (3+) with the calf thymus DNA was investigated by fluorophotometry,then K and n were obtained.
基金the Natural Science Foundation of China (20674022 ,20774031)the Natural Science Foundation of Guangdong province (B09B2061310)
文摘With an aim to develop novel luminescence materials, europium and terbium complexes of 2, 5-(2-thiophene)-pyridine (TPY), 5, 5′-bis(5-(2, 2′-bithiophene))-2, 5-pyridine (B2TPY) and 5, 5′-bis(5-(2, 2′-bithiophene))-2, 2′-bipyridine (B2TBPY) were synthesized, and their luminescence properties were studied. The complexes exhibited ligand-sensitized emission, which was typical of Eu(Ⅲ) and Tb(Ⅲ) ions. The excitation spectra of Eu(Ⅲ) and Tb(Ⅲ) complexes with TPY (or B2TPY or B2TBPY) show similar bands as these with the ligands. It suggests that, the excitation energy is absorbed by TPY or B2TPY or B2TBPY, the energy transfers from its excited single state to its triplet state, and finally transfers from the ligands to Eu(Ⅲ) and Tb(Ⅲ) ions. The luminescence of Eu(Ⅲ) and Tb(Ⅲ) ions in the TPY or B2TPY or B2TBPY complexes indicates that the metal ions are efficiently excited by the absorbed energy from excitation of the ligands.
基金Project supported by the National Natural Science Foundation of China and the China Energy Conservation Investment Corporation (50173004 and 50503002)the Beijing New Star Project (2003A11)+1 种基金the National High-Tech Research Developing Foundation (863. 2003AA324030) Beijing Municipal Commission of Education (JD100100403)
文摘Series of doped rare earth compiexes-EuxGd(1-x) (CA)3·nH2O (CA = citric acid) were synthesized. Some characterizations were taken for these complexes. The experimental results shows that the doped rare earth complexes have the best fluorescence property when the ratio of Eu and Gd is from 0.7 to 0.3. Silicon rubber-based composites were prepared by mechanical blending the EuxGd(1-x) (CA)3·nH2O and silicon rubber. Then, the fluorescent property of the composites was studied. It is found that the fluorescence intensity of the composites increase linearly with the contents of the rare earth complexes increasing.
基金supported by the Natural Science Foundation of Fujian Province(No.2015J01597,2016J05032)Professor Found of Fujian Medical University(JS14008)
文摘A novel complex{[Eu（H;TIA）(C;O;);（H;O）;]·H;O};of Eu（Ⅲ）with aromatic carboxylic triazole(H;TIA=5-（4H-1,2,4-triazol-4-yl）isophthalic acid,H;C;O;=oxalic acid)was hydrothermally synthesized and characterized by IR,UV-Vis,emission spectra and optical activity,and its crystal structure was determined.It crystallizes in triclinic system,space group P1 with a=7.4452（13）,b=10.776（2）,c=11.286（2）?,α=110.546（3）°,β=106.604（3）°,γ=99.031（3）°,V=486.0,GOOF=1.096,the final R=0.0196 and w R=0.0527 for 3081 observed reflections with I≥2σ（I）,R=0.0209 and wR=0.0535 for all data with（Δ/σ）;=0.001,（Δρ）;=0.48 and（Δρ）;=–0.46 e·?;.The natural bond orbital（NBO）charges,electrostatic potential（ESP）and frontier orbital of this complex were also analyzed.The results of anti-bacterial activity against Gram positive（S. aureus）and Gram negative（E. coli）bacteria reveal that the studied complex possesses a moderate inhibiting effect,and the inhibition effect on E.coli is better.
基金financially supported by the Important Foundation of the Educational Commission of Hubei Province (No. Z200622001)the Natural Science Foundation of the Educational Commission of Hubei Province, China (No. J200522002)
文摘The complex of Eu（IH） with 1-（6-hydroxy- 1-naphthyl）- 1,3-butanedione （HNBD） was prepared for the first time and characterized by elemental analysis, IR, UV, fluorescence spectrum, and DTA-TG-DTG techniques. The IR and UV-visible spectra showed that Eu（Ⅲ） ion was coordinated to the HNBD ligand. The fluorescence spectrum showed the presence of Eu^3＋ characteristic emission. The TG-DTA-DTG curves showed that the thermal decomposition of the anhydrous complex was a two-stage process and the final residue was Eu2O3. The thermal decomposition kinetic parameters of the complex were evaluated from TG-DTG data by using three kinds of integral methods （Coat-Redfem equation, Horowitz and Metzger equation, Madhusudanan-Krishnan-Ninan equation）. The kinetic parameters of the first stage are E^＊ = 164.02 kJ.moll, A = 1.31 × 10^15 s^-l, AS^＊= 42.27 J·K^-l·mol^-l, △H^＊ = 159.51 kJ·mol^-l, △G^＊= 136.54 kJ·mol^-l, and n = 3.1, those of the second stage are E^＊= 128.52 kJ·mol^-l, A = 1.44× 106 s^-1, △S^＊= - 136.89 J·K^-l·mol^-l, △H^＊ = 120.41 kJ·mol^-l, △G^＊= 283.85 kJ·mol^-l, and n = 1.1.
文摘The complex Eu(IB)_3(phen)·2H_2O was synthesized. The results show that the strong fluorescence emitting of 593 and 615 nm for Eu^(3+) in the Eu(IB)_3(phen) complex is related to the transitions (()~5D_0-()~7F_1) and (()~5D_0-()~7F_2,) respectively. A sensitive method for the determination of adenosine disodium triphosphate (ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(IB)_3(phen). In conditions of pH 6.7 HAc-NaAc buffer, λ_(ex)=273 nm and λ_(em)=615 nm, the linear range of the determination was 0.1～10 μg·ml^(-1) and the detection limit was 0.03 μg·ml^(-1) for ATP. The method has been applied to determine ATP in adenosine disodium triphosphate tablets samples with relative standard deviation of 2.18% and recovery of (98.4%～)104.0%.
文摘The complex of Eu 3+ and Enoxacin(ENX) and Phen was synthesized. Its compositions is Eu(ENX)_3(phen)Cl_3·2H_2O. Its fluorescence spectra were studied. The results show that the strong fluorescence emitting of 592 and 616 nm for Eu 3+ in the Eu(ENX)_3(phen)Cl_3·2H_2O complex is related to the transitions 5D_0-7F_1 and 5D_0-7F_2 respectively. A sensitive method for the determination of adenosine triphosphate(ATP) by fluorescence quenching is proposed. The method is based on the ability of ATP to inhibit the formation of a strong fluorescent complex of Eu(ENX)_3(phen)Cl_3·2H_2O. In conditions of pH 6.7 in HAc-NaAc buffer and λ_ ex=340 nm and λ_ em=616 nm, the linear range of the determination is 0.4～ 10 μg·ml -1 and the detection limit is 0.034 μg·ml -1 for ATP. The method was applied to determine ATP in adenosine disodium triphosphate injection samples with relative standard deviation of 212% and recovery of 94.8%～1037%.
文摘Ternary complex of Eu （Ⅲ） with 8-hydroxyquinoline （8HOQ） and thenoyhrifluoro-acetone （TTA）, Eu （TTA） （8HOQ）2·H2O was synthesized. The properties and structure of the complex were studied using elemental analysis, infrared spectra and ultraviolet absorption spectra. The fluorescence characteristics and emission mechanism of the complex were also discussed based on the fluorescence spectra.
文摘A new ligand, N,N′-Bis(6-methyl-2-pyridine-N-oxide)-1,3-propane (L), and some binary lanthanide complexes (Ln=Eu^(3+), Tb^(3+)) were synthesized and characterized in detail. The composition of the binary complexes was determined as LnL(NO_3)_3. They are 1∶1 electrolytes in DMF. The complexes have strong characteristic line fluorescence emission spectra, and it is also found that TbL(NO_3)_3 complex has stronger luminescence intensity than EuL(NO_3)_3 in solid state and in methanol.
