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 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.
Highlights
Coumarins and their derivatives due to their biological activities, interesting photophysical and photochemical, and metal binding properties have been a subject of numerous investigations [1,2,3,4,5,6,7,8,9,10,11,12]
The bands in the 3580–3440 cm−1 range are observed in the Eu/coumarin-3-carboxylic acid (C3CA) complex IR spectrum due to the ν(OH) modes of the coordinated water molecules, while the broad band at ∼3180 cm−1 in the IR spectrum of the ligand is assigned to the ν(OH) vibrational mode
In order to find optimal conditions for the ECL process, we studied the dependence of pH on the photoluminescence (PL) intensity of Eu(III) in the solution of Eu/C3CA complex
Summary
Coumarins and their derivatives due to their biological activities, interesting photophysical and photochemical, and metal binding properties have been a subject of numerous investigations [1,2,3,4,5,6,7,8,9,10,11,12]. This group of compounds is known to have diverse applications in biology and medicine, due to their anticancer, antibiotic, anticoagulant, and antiinflammatory [1, 2] properties. A sensitized emission and an effective ligand to metal energy transfer in the samarium complex with 7-acetoxy coumarin 3-carboxylic acid [9], and efficient emission with long lifetimes with low quantum yield values in the systems of Eu3+ and Tb3+
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