期刊
JOURNAL OF LUMINESCENCE
卷 161, 期 -, 页码 123-128出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2014.12.055
关键词
Luminescence; Absorbance; Benzoic acid; Europium; Complexation; Acetonitrile
类别
Luminescence from Eu3+ complexed with benzoic acid (BA) has been studied using acetonitrile (MeCN) as solvent. More than two orders luminescence enhancement is found as compared to Eu3+-BA complex in aqueous medium. The lifetime of Eu3+ in this complex is 900 ns which is much higher as compared to 118 mu s in aqueous medium, suggesting the luminescence enhancement is a result of reduction in non-radiative decay channels in MeCN medium. Luminescence spectroscopy along with UV-vis spectroscopy is used to study the complexation behavior of Eu3+-BA in this medium. In contrary to aqueous medium where Eu3+-BA forms ML and ML2 type species, spectroscopic data reveal formation of only ML3 complex with composition Eu(BA)(3)(MeCN)(6) in MeCN medium. Absorbance, luminescence lifetimes and the ratio of areas of 615-592 nm peaks are used in HypSpec computation program to determine the log beta for the ML3 complex. (C) 2015 Elsevier B.V. All rights reserved.
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