Charge transfer bands in the Eu3+ luminescence excitation spectra of isomeric europium pyridine-dicarboxylates |
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Authors: | L N Puntus V F Zolin V A Kudryashova V I Tsaryuk J Legendziewicz P Gawryszewska R Szostak |
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Institution: | (1) Institute of Radio Engineering and Electronics, Russian Academy of Sciences, pl. Vvedenskogo 1, Fryazino, Moscow oblast, 141120, Russia;(2) Faculty of Chemistry, University of Wrocław, F. Joliot-Curie Str. 14, Wrocław, 50-383, Poland |
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Abstract: | A ligand-cation charge transfer band was observed in the region of 360–400 nm in the Eu3+ luminescence excitation spectrum of europium 3,4-pyridine-dicarboxylates, but was absent in the spectra of europium 2,6-and 2,3-pyridine-dicarboxylates. This band is due to noticeable energy transfer through a charge-transfer state formed owing to the high polarizability of the ligand in the former compound. Energy transfer through the excited ligand-lanthanide charge-transfer state can explain the well-known effect of luminescence quenching by redox-sensitive lanthanide ions. |
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