Improved slow magnetic relaxation in optically pure helicene-based Dy(III) single molecule magnets

Jiang-Kun Ou-Yang (1) , Nidal Saleh (1) , Guglielmo Fernandez-Garcia (1, 2) , Lucie Norel (1) , Fabrice Pointillart (1) , Thierry Guizouarn (1) , Olivier Cador (1) , Federico Totti (2) , Lahcene Ouahab (1) , Jeanne Crassous (1) , Boris Le Guennic (1)

1 ISCR - Institut des Sciences Chimiques de Rennes
2 Department of Chemistry “Ugo Schiff”

Racemic and optically pure [Dy(hfac)(L)] complexes with L = 3-(2-pyridyl)-4-aza[6]-helicene have been synthesized and characterized. Both the racemic and enantiopure forms behave as single molecule magnets in their crystalline phase, while electronic circular dichroism activity is evidenced. Ab initio calculations on isolated complexes followed by the determination of intermolecular dipolar couplings allowed the rationalization of the different low-temperature magnetic behaviours. The enantiopure SMM differs from the racemic one by the presence of a hysteresis loop in the former system.

Domains: Chemical Sciences; Organic chemistry

Jiang-Kun Ou-Yang, Nidal Saleh, Guglielmo Fernandez-Garcia, Lucie Norel, Fabrice Pointillart, et al.. Improved slow magnetic relaxation in optically pure helicene-based Dy(III) single molecule magnets. Chemical Communications, 2016, 52 (100), pp.14474-14477. ⟨10.1039/C6CC08638A⟩. ⟨hal-01416600⟩