Hydroxide-bridged five-coordinate Dy^III single-molecule magnet exhibiting the record thermal relaxation barrier of magnetization among lanthanide-only dimers.

ABSTRACT: A hydroxide-bridged centrosymmetric Dy^III dimer with each Dy^III being five-coordinated has been synthesized using bulky hindered phenolate ligands. Magnetic studies revealed that this compound exhibits a slow magnetic relaxation of a single-ion origin together with a step-like magnetic hysteresis of the magnetic coupled cluster. The thermal relaxation barrier of magnetization is 721 K in the absence of a static magnetic field, while the intramolecular magnetic interaction is very large among reported 4f-only dimers. CASSCF calculations with a larger active space were performed to understand the electronic structure of the compound. The thermal relaxation regime and the quantum tunneling regime are well separated, representing a good model to study the relaxation mechanism of SMMs with intramolecular Dy-Dy magnetic interactions.

SUBMITTER: Xiong J 

PROVIDER: S-EPMC5359878 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature