abstract
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.
keywords
3-(2-PYRIDYL)-1-PYRAZOLYL ACETIC-ACID; LANTHANIDE COMPLEXES; LUMINESCENT PROPERTIES; BRIDGING LIGAND; BETA-DIKETONE; 2,2'-BIPYRIMIDINE; ELECTROLUMINESCENCE; COORDINATION; EPOXIDATION; DIVERSITY
subject category
Chemistry
authors
Coelho, AC; Gomes, AC; Fernandes, JA; Paz, FAA; Braga, SS; Rino, L; Pereira, L; Pillinger, M; Goncalves, IS
our authors
Ana Catarina Costa Gomes Alves
Assistant Researcher
Filipe Alexandre Almeida Paz
Principal Researcher
Isabel Maria de Sousa Gonçalves
Associate Professor
José Alberto Pires Fernandes
Post-doc Fellowship
Martyn Pillinger
Principal Researcher
acknowledgements
This work was supported by the Fundacao para a Ciencia e a Tecnologia (FCT), the Quadro de Referencia Estrategico Nacional (QREN), the Fundo Europeu de Desenvolvimento Regional (FEDER) and the Programa Operacional Factores de Competitividade (COMPETE) through the projects PEst-C/CTM/LA0011/2013 [to the Centre for Research in Ceramics and Composite Materials (CICECO)], PEst-C/QUI/UI0062/2013 (progamme FCOMP-01-0124-FEDER-037296) [to the research unit Quimica Organica, Produtos Naturais e Agroalimentares (QOPNA)], and RECI/FIS-NAN/0183/2012 (programme FCOMP-01-0124-FEDER-027494). J. A. F. thanks the FCT and the European Social Fund through the Programa Operacional Potencial Humano (POPH), for a post-doctoral grant (grant number SFRH/BPD/63736/2009). The FCT is gratefully acknowledged for financial support towards the purchase of the single-crystal diffractometer.