Cis-trans isomerism modulates the magnetic relaxation of dysprosium single-molecule magnets

被引：140

作者：

Wu, Jianfeng ^{[1
,3
]}

Jung, Julie ^{[2
]}

Zhang, Peng ^{[1
]}

Zhang, Haixia ^{[1
]}

Tang, Jinkui ^{[1
]}

Le Guennic, Boris ^{[2
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Peoples R China

[2] Univ Rennes 1, CNRS, UMR 6226, Inst Sci Chim Rennes, 263 Ave Gen Leclerc, F-35042 Rennes, France

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

CHEMICAL SCIENCE | 2016年 / 7卷 / 06期

基金：

中国国家自然科学基金;

关键词：

SPIN-LATTICE-RELAXATION; DY-III; ION MAGNET; ANISOTROPY; COMPLEXES; BARRIERS; BLOCKING; HYSTERESIS; EXCHANGE; MEMORY;

D O I：

10.1039/c5sc04510j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Geometry and magnetic relaxation modulations in a series of mononuclear dysprosium complexes, [DyLz(2)(o-vanilin)(2)]center dot X center dot solvent (Lz = 6-pyridin-2-yl-[1,3,5]triazine-2,4-diamine; X = Br- (1), NO3- (2), CF3SO3- (3)), were realized by changing the nature of the counter-anion. The Dy-III ions in all complexes are eight-coordinate and in approximate D-4d symmetry environments. The magnetic relaxation and anisotropy of these complexes were systematically investigated, both experimentally and from ab initio 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 2 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.

引用

页码：3632 / 3639

页数：8

共 53 条

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