abstract
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.
keywords
SINGLE-ION MAGNETS; BRIDGED COORDINATION POLYMERS; YB-III COMPLEXES; LANTHANIDE COMPLEXES; MOLECULE MAGNETS; SCHIFF-BASE; BASIS-SETS; ANISOTROPY; LIGANDS; CRYSTAL
subject category
Chemistry
authors
Fondo, M; Corredoira-Vazquez, J; Garcia-Deibe, AM; Sanmartin-Matalobos, J; Amoza, M; Botas, AMP; Ferreira, RAS; Carlos, LD; Colacio, E
our authors
Alexandre Manuel Pedroso Botas
Post-Doc Fellowship
Maria Rute de Amorim e Sá Ferreira André
Full professorGroups
G2 - Photonic, Electronic and Magnetic Materials
G3 - Electrochemical Materials, Interfaces and Coatings
acknowledgements
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).