Regulation of excitation and luminescence efficiencies of europium and terbium benzoates and 8-oxyquinolinates by modification of ligands |
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| Institution: | 1. Institute of Radioengineering and Electronics of RAS, Molecular Engineering Laboratory, 1 Vvedenskii Square, 141190 Fryazino, Moscow reg., Russia;2. Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Str., 50-383 Wrocław, Poland;1. Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan;2. Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan;3. Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Kita-21, Nishi-10, Kita-Ku, Sapporo, Hokkaido 001-0021, Japan;1. CEPESQ – Research Centre of Applied Chemistry, Department of Chemistry, Universidade Federal do Paraná – P.O. Box 19081, 81531-980 Curitiba, PR, Brazil;2. GIR-QUESCAT – Department of Inorganic Chemistry, Universidad de Salamanca, Plaza de la Merced S/N, 37998 Salamanca, Spain;3. Universidad de Guadalajara, Department of Chemistry, Boulevard Marcelino García Barragán 1421, C.P. 44430 Guadalajara, Jalisco, Mexico;1. Departamento de Química Fundamental, Universidade Federal de Pernambuco, 50670-901 Recife, PE, Brazil;2. Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil;3. Instituto de Pesquisas Energéticas e Nucleares-IPEN, 05505-800 São Paulo, SP, Brazil;4. Instituto de Química, Universidade de São Paulo, 05508-900 São Paulo, SP, Brazil |
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| 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. |
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