- Isomerism Modulates the Magnetic Relaxation of Dysprosium Single-molecule Magnets

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2018 Jul 17

PMID 30008995

Citations 12

Authors

Jianfeng Wu

Julie Jung

Peng Zhang

Haixia Zhang

Jinkui Tang

Boris Le Guennic

Affiliations

Soon will be listed here.

Abstract

Geometry and magnetic relaxation modulations in a series of mononuclear dysprosium complexes, [DyLz(-vanilin)]·X·solvent (Lz = 6-pyridin-2-yl-[1,3,5]triazine-2,4-diamine; X = Br (), NO (), CFSO ()), were realized by changing the nature of the counter-anion. The Dy ions in all complexes are eight-coordinate and in approximate symmetry environments. The magnetic relaxation and anisotropy of these complexes were systematically investigated, both experimentally and from calculations. All complexes exhibit excellent single-molecule magnetic behavior. Remarkably, magneto-structural studies show that the rotation of the coordinating plane of the square-antiprismatic environment in complex induces a magnetic relaxation path through higher excited states, yielding a high anisotropy barrier of 615 K (696 K for a diluted sample). Additionally, obvious opening of the hysteresis loop is observed up to 7 K, which is the highest blocking temperature ever reported for dysprosium single-molecule magnets.

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