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International Journal of Photoenergy
Volume 2008, Article ID 131702, 6 pages
http://dx.doi.org/10.1155/2008/131702
Research Article

Electrochemiluminescence Study of Europium (III) Complex with Coumarin3-Carboxylic Acid

Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60 780 Poznan, Poland

Received 4 May 2008; Revised 12 June 2008; Accepted 22 July 2008

Academic Editor: Mohamed Sabry Abdel-Mottaleb

Copyright © 2008 Stefan Lis et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The europium (III) complex of coumarin-3-carboxylic acid (C3CA) has been prepared and characterized on the basis of elemental analysis, IR, and emission (photoluminescence and electrochemiluminescence) spectroscopy. The synthesised complex having a formula Eu ( C 3 C A ) 2 ( N O 3 ) ( H 2 O ) 2 was photophysically characterized in solution and in the solid state. Electrochemiluminescence, ECL, of the system containing the Eu(III)/C3CA complex was studied using an oxide-covered aluminium electrode. The goal of these studies was to show the possibility of the use of electrochemical excitation of the Eu(III) ion in aqueous solution for emission generation. The generated ECL emission was very weak, and therefore its measurements and spectral analysis were carried out with the use of cut-off filters method. The studies proved a predominate role of the ligand-to-metal energy transfer (LMET) in the generated ECL.