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

Journal of the Brazilian Chemical Society

Faustino, Wagner M.¹  Espínola, José Geraldo P.¹  Silva Jr., Francisco A.¹  Instituto de Pesquisas Energéticas e Nucleares, São Paulo, Brazil¹  Universidade de São Paulo, São Paulo, Brazil¹  Brito, Hermi F.¹  Universidade Federal de Pernambuco, Recife, Brazil¹  Felinto, Maria Cláudia F. C.¹  Pereira, Dariston K. S.¹  Teotonio, Ercules E. S.¹  Sá, Gilberto F.¹  Nascimento, Helenise A.¹  Universidade Federal da Paraíba, João Pessoa, Brazil¹ 

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

DOI  :  10.5935/0103-5053.20130073

学科分类：化学（综合）

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).

【 授权许可】

Unknown