Fluorescence properties of mixed-ligand europium carboxylates |
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Authors: | I V Kalinovskaya A N Zadorozhnaya Yu M Nikolenko V E Karasev |
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Institution: | (1) Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia;(2) Vladivostok State Medical University, pr. Ostryakova 2, Vladivostok, 690950, Russia |
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Abstract: | Mixed-ligand binuclear and mononuclear europium carboxylate complexes with nitrogen-and phosphorus-containing neutral ligands have been studied by luminescence and X-ray photoelectron spectroscopy. The coordination of neutral ligands through the nitrogen donor atom leads to an increase in electron density at the Eu3+ atom. In groups of carboxylates of the same type, the coordination of neutral donor ligands leads to an increase in the relative intensity of the 5 D 0-7 F 4 electric dipole transition. Analysis of the luminescence excitation spectra points to the presence of two excitation energy transfer channels for mixed-ligand europium trifluoroacetate and toluate complexes and of one channel for europium cinnamate complexes with neutral ligands. |
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