The luminescent behavior on formation 1∶1 complex of 25,26,27,28 tetra carboxylic acid 5,11,17,23 calixarenesulfonate(L 2) and terbium(Ⅲ) ion was investigated by means of fluorescence spectra. The results showed tha...The luminescent behavior on formation 1∶1 complex of 25,26,27,28 tetra carboxylic acid 5,11,17,23 calixarenesulfonate(L 2) and terbium(Ⅲ) ion was investigated by means of fluorescence spectra. The results showed that the pH value of the solution had obviousan influence on the fluorescence intensity of L 2·Tb 3+ complex, but the fluorescence intensity was hardly changed over the pH range from 6 to 11. The complex exhibits a higher emission quantum yield( φ =0.31) in aqueous solution, which indicates energy transfer type emission. The complexation behavior of L 2 with trivalent lanthanoid ions(Tb 3+ and Eu 3+ ) was also studied in aqueous boracic acid(hydrochloric acid buffer solution(pH 8.0) at 25 ℃ by UV Vis and fluorescence measurements. The spectrophotometric titrations have been performed to give the complex stability constants( K S) for the stoichiometric 1∶1 inclusion complexation of L 2 with Tb 3+ and Eu 3+ . The complex stability for L 2·Eu 3+ was higher than that for L 2·Tb 3+ , but no characteristic fluorescence was found.展开更多
The crystal structure of Eu(TFPB)3bpy [TFPB: 4,4,4-trifluoro-1-phenyl-1,3- butanedione, bpy: 2,2′-bipyridyl] has been determined by single crystal X-ray diffraction and the coordination geometry of Eu atom is a squar...The crystal structure of Eu(TFPB)3bpy [TFPB: 4,4,4-trifluoro-1-phenyl-1,3- butanedione, bpy: 2,2′-bipyridyl] has been determined by single crystal X-ray diffraction and the coordination geometry of Eu atom is a square antiprism. The complex can give the characteristic luminescence of Eu3+ upon UV excitation. CCDC: 224879.展开更多
文摘The luminescent behavior on formation 1∶1 complex of 25,26,27,28 tetra carboxylic acid 5,11,17,23 calixarenesulfonate(L 2) and terbium(Ⅲ) ion was investigated by means of fluorescence spectra. The results showed that the pH value of the solution had obviousan influence on the fluorescence intensity of L 2·Tb 3+ complex, but the fluorescence intensity was hardly changed over the pH range from 6 to 11. The complex exhibits a higher emission quantum yield( φ =0.31) in aqueous solution, which indicates energy transfer type emission. The complexation behavior of L 2 with trivalent lanthanoid ions(Tb 3+ and Eu 3+ ) was also studied in aqueous boracic acid(hydrochloric acid buffer solution(pH 8.0) at 25 ℃ by UV Vis and fluorescence measurements. The spectrophotometric titrations have been performed to give the complex stability constants( K S) for the stoichiometric 1∶1 inclusion complexation of L 2 with Tb 3+ and Eu 3+ . The complex stability for L 2·Eu 3+ was higher than that for L 2·Tb 3+ , but no characteristic fluorescence was found.
文摘The crystal structure of Eu(TFPB)3bpy [TFPB: 4,4,4-trifluoro-1-phenyl-1,3- butanedione, bpy: 2,2′-bipyridyl] has been determined by single crystal X-ray diffraction and the coordination geometry of Eu atom is a square antiprism. The complex can give the characteristic luminescence of Eu3+ upon UV excitation. CCDC: 224879.
基金Supported by the National Natural Science Foundation of China(No.21371153,No.20901070)Program for Science&Key Scientific and Technological Project of Henan Province(No.132102210411)Key Scientific Research Project Plan in Colleges and Universities of Henan Province(No.16A150045)~~
