Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 380, Issue 1-2, Pages 279-284Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2004.03.055
Keywords
lanthanide pyridine-carboxylates; luminescence spectra; luminescence excitation spectra; vibration spectra; charge transfer
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Luminescence, luminescence excitation, IR, and Raman spectra of europium and terbium isomeric pyridine-carboxylates: isonicotinates, nicotinates and picolinates were studied. The ways of the excitation energy transfer from the ligand to Ln(3+) were analysed in dependence on the structure and the type of co-ordination of ligand. Intraligand charge transfer bands and Tb3+ f-d transition bands were identified in the luminescence excitation spectra of terbium and europium compounds. Co-ordination of nitrogen atom by terbium ion in picolinates (and dipicolinates) causes low-frequency shift of the f-d bands and promotes the excitation of luminescence through d-states of Tb3+. (C) 2004 Elsevier B.V. All rights reserved.
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