2011•Chinese Rare EarthsRequires access

Synthesis,Characterization and Spectroscopic Properties of Ternary Light Rare Earth Complexes with Thiophene-2,5-dicarboxylic Acid and 1,10-phenanthroline

Yong Zhang, Jiwei Hu

Abstract

A series of novel ternary complexes of light rare earths with thiophene -2,5 - dicarboxylic acid(H_2L) and 1, 10 - phenanthroline were synthesized and characterized by elemental analysis,TG - DTA and FTIR spectra.The compositions of the complexes were confirmed to be Ln_2(L)_3(phen)_2·nH_2O(Ln = La,n=2;Ln =Sm、Eu、Gd,n=4).The fluorescence properties of Eu_2(L)_3(phen)_2·4H_2O were specially studied,and the measured fluorescence lifetime was 0.83 ms.The low- est triplet state energy of H_2L was determined to be 18200 cm~(-1) by measuring the phosphorescence spectra of their corresponding gadolinium complexes as model compounds.The mechanism and efficiency of intramolecular energy transfer between ligands were discussed in detail.

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Key concepts: Phenanthroline, Intramolecular force, Ternary operation, Chemistry, Thiophene, Fluorescence, Phosphorescence, Dicarboxylic acid