Tetrathiafulvalene-Based Helicene Ligand in the Design of a Dysprosium Field-Induced Single-Molecule Magnet

Fabrice Pointillart (1) , Jiang-Kun Ou-Yang (1) , Guglielmo Fernandez Garcia (1, 2) , Vincent Montigaud (1) , Jessica Flores Gonzalez (1) , Rémi Marchal (1) , Ludovic Favereau (1) , Federico Totti (2) , Jeanne Crassous (1) , Olivier Cador (1) , Lahcène Ouahab (1) , Boris Le Guennic (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 UniFI - Università degli Studi di Firenze = University of Florence

The design of a coordination complex that involves a ligand combining both a tetrathiafulvalene core and a helicene fragment was achieved thanks to the reaction between the new 2-{1-[2-methyl[6]helicene]-4,5-[4,5-bis(propylthio)tetrathiafulvalenyl]-1 H-benzimidazol-2-yl}pyridine ligand (L) and the Dy(hfac)·2HO metalloprecursor. Magnetic investigations showed field-induced single-molecule-magnet (SMM) behavior under an applied magnetic field of 1000 Oe for [Dy(hfac)(L)]·0.5CHCl, while experimentally oriented single-crystal magnetic measurements allowed for determination of the magnetic anisotropy orientation. The magnetic behavior was rationalized through ab initio CASSCF/SI-SO calculations. This redox-active chiral-field-induced SMM paves the way for the design of switchable-multiproperty SMMs.

Domains: Chemical Sciences; Coordination chemistry

Fabrice Pointillart, Jiang-Kun Ou-Yang, Guglielmo Fernandez Garcia, Vincent Montigaud, Jessica Flores Gonzalez, et al.. Tetrathiafulvalene-Based Helicene Ligand in the Design of a Dysprosium Field-Induced Single-Molecule Magnet. Inorganic Chemistry, 2019, 58 (1), pp.52-56. ⟨10.1021/acs.inorgchem.8b02830⟩. ⟨hal-01976516⟩