resumo
Three new lanthanide(III) complexes (Ln = Sm, Tb and Eu) of picolinic and glutaric acid were prepared and characterised. The crystal structure of the complex [Sm(glu)(pic)(H(2)O)2] (where Hpic and H(2)glu stand for picolinic and glutaric acid, respectively) was determined by single-crystal Xray diffraction. All the Ln complexes were characterised by elemental analysis, infrared spectroscopy, X-ray powder diffraction and thermoanalytical measurements. The combined data show that these Ln complexes are isostructural. The effect of both organic ligands on the photolumine scent behaviour of the Sm(3+), Eu(3+) and Tb(3+) complexes is discussed and we anticipate the possibility of controlling the photoluminescence of picolinic-containing lanthanide compounds by systematically varying the length of the bridging ligand. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007).
palavras-chave
TRANSITION-METAL COMPLEXES; CAMBRIDGE STRUCTURAL DATABASE; RAY CRYSTAL-STRUCTURES; 3-HYDROXYPICOLINIC ACID; MAGNETIC-PROPERTIES; COORDINATION POLYMERS; 2-HYDROXYNICOTINIC ACID; COBALT(II) COMPLEXES; POWDER DIFFRACTION; DICHOTOMY METHOD
categoria
Chemistry
autores
Girginova, PI; Paz, FAA; Soares-Santos, PCR; Ferreira, RAS; Carlos, LD; Amaral, VS; Klinowski, J; Nogueira, HIS; Trindade, T
nossos autores
Filipe Alexandre Almeida Paz
Investigador Principal
Helena Isabel Seguro Nogueira
Professor Auxiliar com Agregação
Luís Carlos
Professor Catedrático
Maria Rute de Amorim e Sá Ferreira André
Professor Catedrático
Paula Cristina Ramos Soares e Santos
Técnico de Laboratório
Tito Trindade
Professor Catedrático