Probing Relaxation Dynamics in Five-Coordinate Dysprosium Single-Molecule Magnets.

ABSTRACT: A new family of five-coordinate lanthanide single-molecule magnets (Ln SMMs) [Dy(Mes*O)₂ (THF)₂ X] (Mes*=2,4,6-tri-tert-butylphenyl; X=Cl, 1; Br, 2; I, 3) is reported with energy barriers to magnetic reversal >1200 K. The five-coordinate Dy^III ions have distorted square pyramidal geometries, with halide anions on the apex, and two Mes*O ligands mutually trans- to each other, and the two THF molecules forming the second trans- pair. These geometrical features lead to a large magnetic anisotropy in these complexes along the trans-Mes*O direction. QTM and Raman relaxation times are enhanced by varying the apex halide from Cl to Br to I, or by dilution in a diamagnetic yttrium analogue.

SUBMITTER: Parmar VS 

PROVIDER: S-EPMC7383731 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature