Energy transfer processes in Tb(III)-dibenzoylmethanate complexes with phosphine oxide ligands

Journal of the Brazilian Chemical Society

Francisco A. Silva Jr.²  Helenise A. Nascimento²  Dariston K. S. Pereira²  Ercules E. S. Teotonio²  Hermi F. Brito¹  Maria Cláudia F. C. Felinto¹  José Geraldo P. Espínola²  Gilberto F. Sá¹  Wagner M. Faustino² 

[1] ,Universidade Federal da Paraíba Departamento de Química João Pessoa PB ,Brazil

关键词: terbium(III);    β-diketonate;    phosphine oxide;    energy transfer;   

DOI  :  10.5935/0103-5053.20130073

来源: SciELO

【 摘 要 】

The Tb3+-β-diketonate complexes [Tb(DBM)3L], [Tb(DBM)2(NO3)L2] and [Tb(DBM)(NO3)2(HMPA)2] (DBM = dibenzoylmethanate; L: TPPO = triphenylphosphine oxide or HMPA = hexamethylphosphine oxide) were prepared and characterized by elemental analysis (CHN), complexometric titration with EDTA and Fourier transform infrared (FTIR) spectroscopy, and the photoluminescence properties evaluated. The triplet state energies of the coordinated DBM ligands were determined using time-resolved phosphorescence spectra of analogous Gd3+ complexes. The results show that the energies increase along with the number of coordinated nitrate anions replacing the DBM ligand in the complexes. The luminescence spectra and emission lifetime measurements revealed that the ligand-to-metal energy transfer efficiency follows the same tendency. Unlike the tris-DBM complexes, bis- and mono-DBM presented high luminescence, and may act as promising candidates for preparation of the emitting layer of light converting molecular devices (LCMDs).

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