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Citation: Gao Feng, Niu Chun-Ji, Ni Jia-Zuan. Study on Rare Earth-Hedta-Serine Ternary System by Potentiometry and Fluorescence Spectroscopy[J]. Acta Physico-Chimica Sinica, ;1991, 7(03): 362-365. doi: 10.3866/PKU.WHXB19910321 shu

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

1.
Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022

Received Date: 28 February 1990
Available Online: 15 June 1991

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.
- Rare earth-HEDTA-Serine ternary; Potentiometric titration; Fluorescence
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