Europium can form a stable chelate with pyridine-2,4,6-tricarboxylic acid (PTA) with a ratio of 1:1 in aqueous. The system, having the maximum excitation and emission wavelengths at 311.0 nm and 616.3 nm, separately, ...Europium can form a stable chelate with pyridine-2,4,6-tricarboxylic acid (PTA) with a ratio of 1:1 in aqueous. The system, having the maximum excitation and emission wavelengths at 311.0 nm and 616.3 nm, separately, shows a constant fluorescence intensity in the pH range of 11.0-12.0. The method has high selectivity and sensitivity as well as low effect from foreign ions. The optimum determinate conditions were obtained. The fluorescence intensity is a linear function of Eu3+, concentration in the range of 0.0029-1.5200 mu g center dot mL(-1) and the limit of detection is 2.90 ng center dot mL(-1).展开更多
The title complex {[（C6H5CH2）4Sn2（OOCC9H11）（ONHCH2C6H5）]O}2 （CgH11COO = 2,4,6- trimethyibenzolicate） has been synthesized by the reaction of bis-benzyitin oxide with 2,4,6-trimethyibenzolic acid and N-benzyihy...The title complex {[（C6H5CH2）4Sn2（OOCC9H11）（ONHCH2C6H5）]O}2 （CgH11COO = 2,4,6- trimethyibenzolicate） has been synthesized by the reaction of bis-benzyitin oxide with 2,4,6-trimethyibenzolic acid and N-benzyihydroxylamine in 1：1：1 molar radio （C45H47NO4Sn2） and characterized by IR, ^1H NMR spectra and elemental analysis, and its crystal structure was determined by X-ray diffraction. It crystallizes in monoclinic, space group P21/c with α = 1.5654（5）, b = 1.6467C6）, c = 1.7433C6） nm, β = 111.729C5）°, Z = 2, V = 4.175C2） nm^3, Mr = 903.22, Dc = 1.437 g/cm^3,μ = 1 .238 mm^-1, F（000） = 1824, R = 0.0440 and wR = 0.0906. The structure shows that the central tin atom is five-coordinated to assume a distorted trigonai bipyramidai configuration. The compound belongs to centrosymmetric dimer structure with four-membered central endo-cyclic Sn202 units in which the bridging oxygen atoms are tri-coordinated.展开更多
A binuclear terbium complex with 2,4,6-Trimethylbenzoate and 1,10-phenanthroline,[Tb2(TMBA)6(Phen)2],has been synthesized(TMBA=2,4,6-Trimethylbenzoic acid and phen=1,10-phenanthroline)and characterized by IR,elemental...A binuclear terbium complex with 2,4,6-Trimethylbenzoate and 1,10-phenanthroline,[Tb2(TMBA)6(Phen)2],has been synthesized(TMBA=2,4,6-Trimethylbenzoic acid and phen=1,10-phenanthroline)and characterized by IR,elemental analysis and X-ray diffraction methods.The title complex crystallizes in monoclinic system,space group P21 /c with a=1.327 5(2)nm,b=2.817 9(5)nm,c=1.282 5(2)nm,β=116.692(3)°,V=4.286 2(13)nm3,Z=4,Dc=1.423 g·cm-3.There are four bridged carboxylate groups of the 2,4,6-trimethylbenzoic acid bonded to the two terbium ions,each ions is also chelated with the two oxygen atoms of a molecule of the 2,4,6-trimethylbenzoic acid and the two nitrogen atoms of a 1,10-phenanthroline respectively,forming a 8-coordination distorted square antiprism.Average Tb-O and Tb-Ndistance of the two Tb(Ⅲ)ions are equal respectively.This shows the two terbium ions are in the same chemical enviorments.The complex emits intense green fluorescence under ultraviolet light.CCDC:619215.展开更多
The title compound, [Mn(2,4,6-TMBA)2(H2O)3]n·2nH2O (1), where 2,4,6-TMBA=2,4,6-trimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction analysis. The crystal is of mono...The title compound, [Mn(2,4,6-TMBA)2(H2O)3]n·2nH2O (1), where 2,4,6-TMBA=2,4,6-trimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction analysis. The crystal is of monoclinic, space group C2/c with a=2.929 9(6) nm, b=1.036 4(2) nm, c=8.222 04(17) nm, V=2.494 7(9) nm3, Z=4, M=471.40, Dc=1.255 g·cm-3, μ=0.571 mm-1, F(000)=996, Rint=0.029 4, R=0.037 6 and wR=0.094 9. The Mn atoms are octahedrally coordinated by two O atoms of two ligands and four O atoms of water. The carboxyl group coordinates to Mn(Ⅱ)in the mode of monodentate, while the O atoms of water molecules coordinates in bridging mode. The complex shows a one-dimensional chain structure bridged by water molecules. CCDC: 297750.展开更多
基金This project was financially supported by the Natural Science Foundation of Gansu Province, China (ZR-97-21).
文摘Europium can form a stable chelate with pyridine-2,4,6-tricarboxylic acid (PTA) with a ratio of 1:1 in aqueous. The system, having the maximum excitation and emission wavelengths at 311.0 nm and 616.3 nm, separately, shows a constant fluorescence intensity in the pH range of 11.0-12.0. The method has high selectivity and sensitivity as well as low effect from foreign ions. The optimum determinate conditions were obtained. The fluorescence intensity is a linear function of Eu3+, concentration in the range of 0.0029-1.5200 mu g center dot mL(-1) and the limit of detection is 2.90 ng center dot mL(-1).
基金This work was supported by the Natural Science Foundation of Hunan Province (05JJ40015)
文摘The title complex {[（C6H5CH2）4Sn2（OOCC9H11）（ONHCH2C6H5）]O}2 （CgH11COO = 2,4,6- trimethyibenzolicate） has been synthesized by the reaction of bis-benzyitin oxide with 2,4,6-trimethyibenzolic acid and N-benzyihydroxylamine in 1：1：1 molar radio （C45H47NO4Sn2） and characterized by IR, ^1H NMR spectra and elemental analysis, and its crystal structure was determined by X-ray diffraction. It crystallizes in monoclinic, space group P21/c with α = 1.5654（5）, b = 1.6467C6）, c = 1.7433C6） nm, β = 111.729C5）°, Z = 2, V = 4.175C2） nm^3, Mr = 903.22, Dc = 1.437 g/cm^3,μ = 1 .238 mm^-1, F（000） = 1824, R = 0.0440 and wR = 0.0906. The structure shows that the central tin atom is five-coordinated to assume a distorted trigonai bipyramidai configuration. The compound belongs to centrosymmetric dimer structure with four-membered central endo-cyclic Sn202 units in which the bridging oxygen atoms are tri-coordinated.
文摘A binuclear terbium complex with 2,4,6-Trimethylbenzoate and 1,10-phenanthroline,[Tb2(TMBA)6(Phen)2],has been synthesized(TMBA=2,4,6-Trimethylbenzoic acid and phen=1,10-phenanthroline)and characterized by IR,elemental analysis and X-ray diffraction methods.The title complex crystallizes in monoclinic system,space group P21 /c with a=1.327 5(2)nm,b=2.817 9(5)nm,c=1.282 5(2)nm,β=116.692(3)°,V=4.286 2(13)nm3,Z=4,Dc=1.423 g·cm-3.There are four bridged carboxylate groups of the 2,4,6-trimethylbenzoic acid bonded to the two terbium ions,each ions is also chelated with the two oxygen atoms of a molecule of the 2,4,6-trimethylbenzoic acid and the two nitrogen atoms of a 1,10-phenanthroline respectively,forming a 8-coordination distorted square antiprism.Average Tb-O and Tb-Ndistance of the two Tb(Ⅲ)ions are equal respectively.This shows the two terbium ions are in the same chemical enviorments.The complex emits intense green fluorescence under ultraviolet light.CCDC:619215.
文摘The title compound, [Mn(2,4,6-TMBA)2(H2O)3]n·2nH2O (1), where 2,4,6-TMBA=2,4,6-trimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction analysis. The crystal is of monoclinic, space group C2/c with a=2.929 9(6) nm, b=1.036 4(2) nm, c=8.222 04(17) nm, V=2.494 7(9) nm3, Z=4, M=471.40, Dc=1.255 g·cm-3, μ=0.571 mm-1, F(000)=996, Rint=0.029 4, R=0.037 6 and wR=0.094 9. The Mn atoms are octahedrally coordinated by two O atoms of two ligands and four O atoms of water. The carboxyl group coordinates to Mn(Ⅱ)in the mode of monodentate, while the O atoms of water molecules coordinates in bridging mode. The complex shows a one-dimensional chain structure bridged by water molecules. CCDC: 297750.
