resumo
The mononuclear complex [Yb(H3L1,1,4)]center dot 2MeOH (1.2MeOH), with a new heptadentate N4O3 ligand, was isolated and structurally characterised. The opto-magnetic properties of 1.2MeOH were investigated, showing that this complex is a bifunctional compound. Accordingly, 1.2MeOH reveals two coexisting functionalities: field-induced single molecule magnet behaviour, and Yb3+-centred NIR fluorescence dependent on temperature (25-300 K). The magnetic relaxation in this pentagonal bipyramidal complex does not seem to be of the Orbach type, and this is supported by the discrepancy between the anisotropic energy barrier found by fitting the magnetic data to an Orbach model and by spectroscopic studies. Ab initio calculations further validate the magnetic relaxation mechanisms and spectroscopic results.
palavras-chave
SINGLE-ION MAGNETS; BRIDGED COORDINATION POLYMERS; YB-III COMPLEXES; LANTHANIDE COMPLEXES; MOLECULE MAGNETS; SCHIFF-BASE; BASIS-SETS; ANISOTROPY; LIGANDS; CRYSTAL
categoria
Chemistry
autores
Fondo, M; Corredoira-Vazquez, J; Garcia-Deibe, AM; Sanmartin-Matalobos, J; Amoza, M; Botas, AMP; Ferreira, RAS; Carlos, LD; Colacio, E
nossos autores
Alexandre Manuel Pedroso Botas
Bolseiro de pós-Doutoramento
Maria Rute de Amorim e Sá Ferreira André
Professor CatedráticoGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
Authors thank the Spanish Ministerio de Innovacion, Ciencia y Universidades (PGC2018 102052-B-C21), and the Portuguese Foundation for Science and Technology/MCTES (UIDB/50011/2020 & UIDP/50011/20) for financial support. J. C. V thanks Xunta de Galicia for his Ph.D. fellowship (ED481A-2018/136).