Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 135, Issue -, Pages 405-409Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2014.07.022
Keywords
Fluorescence; Co-fluorescence; 2,6-Pyridine dicarboxylic acid; Terbium; Europium; Acetonitrile
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Fluorescence from Tb3+ and Eu3+ complexed with 2,6-pyridine dicarboxylic acid (PDA) has been studied using acetonitrile (MeCN) as solvent. The enhancement in fluorescence intensity because of non-aqueous environment provided by the MeCN is less significant, where as fluorescence enhancement of more than two orders of magnitude has been observed with the addition of La3+; a process known as co-fluorescence in MeCN. The present study demonstrates for the first time co-fluorescence of Tb3+ and Eu3+ with excitation through the absorption of PDA. Intermolecular energy transfer is believed to be responsible for co-fluorescence enhancement and it becomes possible as the quenching due to water at the secondary coordination spheres of Tb3+ and Eu3+ is reduced when MeCN is used as solvent. (C) 2014 Published by Elsevier B.V.
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