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Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands

Paper ID Volume ID Publish Year Pages File Format Full-Text
28691 44085 2006 10 PDF Available
Title
Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands
Abstract

The opportunities of optimisation of luminance of the lanthanide compounds by modification of ligands are discussed. Variations of the excitation and luminescence efficiencies at introduction of nitro- (NO2), sulfo- (SO3−), hydroxy- (OH), amino- (NH2), and phenylamino- (NHC6H5) groups in the aromatic ligands were studied. Investigation of luminescence and luminescence excitation spectra of europium and terbium compounds with 10 derivatives of benzoic acid, 2-furancarboxylic acid and their adducts with 1,10-phenanthroline and 2,2′-bipyridine was undertaken. Study of the spectra of lanthanide 8-oxyquinolinates was carried out also. Luminescence efficiencies were measured at 77 and 300 K. Paths of the energy transfer from the ligands to Ln3+ ion were examined. Influence of radicals on the energies of the ligand triplet states and on the energies of the ligand–metal charge transfer states (LM CTS) of europium compounds was analysed. High luminescence efficiencies of europium and terbium benzoates, and terbium anthranylates and salicylates were obtained. Effect of increasing the luminescence efficiencies of europium salicylates and 8-oxyquinolinates at introduction of acceptor nitro-and sulfo-groups in the ligand was revealed. Channel of dissipation of the excitation energy through the ligand π*–n transition of europium and terbium nitro- and dinitrobenzoates was found. Influence of relative positions of the lowest triplet levels of two non-equivalent ligands of compound on the energy transfer to Eu3+ and Tb3+ ions was considered.

Keywords
Eu3+; Tb3+; Benzoates; Anthranylates; Salicylates; 8-Oxyquinolinates; Luminescence excitation spectra; Luminescence efficiency; Ligand–metal charge transfer
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Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 177, Issues 2–3, 25 January 2006, Pages 314–323
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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