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

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

doi:10.1021/acs.inorgchem.8b02830

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

Inorg Chem. 2019 Jan 7;58(1):52-56. doi: 10.1021/acs.inorgchem.8b02830. Epub 2018 Dec 14.

Affiliations

¹ Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226 , 35000 Rennes , France.
² Department of Chemistry "Ugo Schiff" and INSTM RU , University of Florence , 50019 Sesto Fiorentino , Italy.

Abstract

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)₃·2H₂O metalloprecursor. Magnetic investigations showed field-induced single-molecule-magnet (SMM) behavior under an applied magnetic field of 1000 Oe for [Dy(hfac)₃(L)]·0.5CH₂Cl₂, 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.