Cofluorescence of Eu3+ in complexes of aromatic carboxylic acids

被引：26

作者：

Panigrahi, BS ^{[1
]}

Peter, S ^{[1
]}

Viswanathan, KS ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Mat Chem Div, Kalpakkam 603102, Tamil Nadu, India

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 1997年 / 53卷 / 14期

关键词：

cofluorescence; Eu3+ fluorescence; fluorescence enhancement; trimesic acid; pyromellitic acid; mellitic acid; La3+;

D O I：

10.1016/S1386-1425(97)00190-X

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The fluorescence of Eu3+ in certain Eu3+-aromatic acid complexes were enhanced by over two orders of magnitude, by the addition of La3+; a process referred to as cofluorescence. Cofluorescence was observed only with certain aromatic acid ligands; trismesic acid, pyromellitic acid and mellitic acid; thereby clearly establishing a correlation between the structure of the ligand and the process of cofluorescence. While cofluorescence has been extensively studied using beta-diketones as ligands, our studies demonstrate cofluorescence for the first time in ligands other than beta-diketones. Furthermore, the mechanism of cofluorescence in the aromatic acid complexes studied by us appears to be different from that operating in the beta-diketones. While intermolecular energy transfer is believed to occur in the beta-diketones, formation of polynuclear complexes appears to be responsible for cofluorescence in the aromatic acid ligands. (C) 1997 Elsevier Science B.V.

引用

页码：2579 / 2585

页数：7

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