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高等学校化学研究 ›› 1998, Vol. 14 ›› Issue (4): 359-364.

• Articles • 上一篇    下一篇

Stability Constants and Fluorescence of Terbium(Ⅲ) Complexes with Polyaminopolycarboxylates in Aqueous Solution

GONG Meng-lian, WU Wei-ning, SHI Hua-hong, LEI Heng-yi, MENG Jian-xin, YANG Yan-sheng   

  1. Department of Chemistry, Zhongshan Univercity, Guangzhou 510275
  • 收稿日期:1997-07-30 出版日期:1998-12-24 发布日期:2011-08-17
  • 通讯作者: GONG Meng-lian
  • 基金资助:

    Supported by the National Scientific and Technological Committee of China and the Natural Science Foundation of Guang dong Province.

Stability Constants and Fluorescence of Terbium(Ⅲ) Complexes with Polyaminopolycarboxylates in Aqueous Solution

GONG Meng-lian, WU Wei-ning, SHI Hua-hong, LEI Heng-yi, MENG Jian-xin, YANG Yan-sheng   

  1. Department of Chemistry, Zhongshan Univercity, Guangzhou 510275
  • Received:1997-07-30 Online:1998-12-24 Published:2011-08-17

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摘要： Five polyaminopolycarboxylic acids(EDT A and DTPA derivatives),DTPA·pAS,DT PA·2pA S,D T P A·pA B,EDT A·pA S and ED T A·pAB,w her e pA S and pA B repr esent p-aminosal-icylate and p-amino benzoate groups,r espectively,were synthesized,and the stability constants of Tb3+complexes with these lig ands were deter mined,for the first time,by means of pH potentio-metrictitration.The complex ationrates of Tb(Ⅲ)with these ligands were found to be very slow,so batch technique was employed in the titration.The stepwise protonation constants of the ligands and the stability constants of their Tb3+ complexes were calculated with the progr am BEST.It was shownthatintr oducing p-aminosalicylate or p-amino benzoate groups into EDT A or DTPA leads to the decrease in acidity.The species distributions in the complex solutions at various pH accorded with the results of fluorescence measurements.A replacement of EDT A with DTPA·2pAS in EDTA-Tb complex solutionled to the enhancement in Tb3+ sensitized luminescence.The effects of the ligands'structure on the stability and fluo rescence of the complexes were discussed.

关键词: Terbium(Ⅲ), Polyaminopolycarboxylate, Complex, Stability constant, Fluorescence

Abstract: Five polyaminopolycarboxylic acids(EDT A and DTPA derivatives),DTPA·pAS,DT PA·2pA S,D T P A·pA B,EDT A·pA S and ED T A·pAB,w her e pA S and pA B repr esent p-aminosal-icylate and p-amino benzoate groups,r espectively,were synthesized,and the stability constants of Tb3+complexes with these lig ands were deter mined,for the first time,by means of pH potentio-metrictitration.The complex ationrates of Tb(Ⅲ)with these ligands were found to be very slow,so batch technique was employed in the titration.The stepwise protonation constants of the ligands and the stability constants of their Tb3+ complexes were calculated with the progr am BEST.It was shownthatintr oducing p-aminosalicylate or p-amino benzoate groups into EDT A or DTPA leads to the decrease in acidity.The species distributions in the complex solutions at various pH accorded with the results of fluorescence measurements.A replacement of EDT A with DTPA·2pAS in EDTA-Tb complex solutionled to the enhancement in Tb3+ sensitized luminescence.The effects of the ligands'structure on the stability and fluo rescence of the complexes were discussed.

Key words: Terbium(Ⅲ), Polyaminopolycarboxylate, Complex, Stability constant, Fluorescence