物理化学学报 >> 1991, Vol. 7 >> Issue (03): 362-365.doi: 10.3866/PKU.WHXB19910321

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稀土-HEDTA-丝氨酸三元体系的pH电位法和荧光光谱研究

高峰; 牛春吉; 倪嘉缵   

  1. 中国科学院长春应用化学研究所,长春 130022
  • 收稿日期:1990-02-28 修回日期:1990-08-26 发布日期:1991-06-15
  • 通讯作者: 牛春吉

Study on Rare Earth-Hedta-Serine Ternary System by Potentiometry and Fluorescence Spectroscopy

Gao Feng; Niu Chun-Ji; Ni Jia-Zuan   

  1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022
  • Received:1990-02-28 Revised:1990-08-26 Published:1991-06-15
  • Contact: Niu Chun-Ji

关键词: 稀土-HEDTA-丝氨酸三元体系, 电位滴定, 荧光光谱

Abstract: In this paper a rare earth-HEDTA-serine (Ser) ternary system has been studied by potentiometric titration at 25 ℃ with an ionic strength of 0.15 mol·L~(-1)(NaCl). The excitation and fluorescence spectra of TbCl_3, Tb-Ser,Tb-HEDTA and Tb-HEDTA-Ser have been determined at room temperature. The stability constants of these ternary complexes have been obtained. It has been found that Tb-HEDTA-Ser ternary system exhibit scharacteristic fluorescence spectrum of Tb~(3+) sensitized by two ligands. The results mean that the chemical bond tetween the central ion and the ligand in this ternary system is predominantly ionic in character, and the energy transfer from ligand to Tb~(3+) is performed by a kind of short-range electron exchange action.

Key words: Rare earth-HEDTA-Serine ternary, Potentiometric titration, Fluorescence