Autor(es):
Coelho, Ana C. ; Gomes, Ana C. ; Fernandes, Jose A. ; Almeida Paz, Filipe A. ; Braga, Susana S. ; Rino, Luis ; Pereira, Luiz ; Pillinger, Martyn ; Goncalves, Isabel S.
Data: 2014
Identificador Persistente: http://hdl.handle.net/10773/21010
Origem: RIA - Repositório Institucional da Universidade de Aveiro
Assunto(s): 3-(2-PYRIDYL)-1-PYRAZOLYL ACETIC-ACID; LANTHANIDE COMPLEXES; LUMINESCENT PROPERTIES; BRIDGING LIGAND; BETA-DIKETONE; 2,2'-BIPYRIMIDINE; ELECTROLUMINESCENCE; COORDINATION; EPOXIDATION; DIVERSITY
Descrição
The homodinuclear europium(III) -diketonate complex [Eu-2(bta)(4)(pypzCH(2)COO)(2)] (1) {bta = 1-benzoyl-3,3,3-trifluoroacetonate, pypzCH(2)COO = [3-(2-pyridyl)-1-pyrazolyl]acetate} was isolated after recrystallization of the crude product obtained from the reaction of [Eu(bta)(3)(H2O)(2)] with one equivalent of the ligand phenyl[3-(2-pyridyl)-1-pyrazolyl]acetate (pypzCH(2)CO(2)C(6)H(5)). A single-crystal X-ray diffraction study confirmed that during the recrystallization the hydrolysis of the ester group in pypzCH(2)CO(2)C(6)H(5) took place to give pypzCH(2)COO(-), which culminated in the crystallization of dinuclear complex 1 in which each Eu3+ ion is coordinated to two O,O-chelated bta(-) groups and one N,N-chelated pyrazolylpyridine ligand, and the two metal centers are linked by tridentate chelating-bridging ((2)-(2),(1)) carboxylate groups. The luminescence properties of 1 were investigated by steady-state photoluminescence (PL), PL excitation, and time-resolved PL.
