Bromine-bridged Dy2 single-molecule magnet: magnetic anisotropy driven by cis/trans stereoisomers

Min Li; Haipeng Wu; Zhengqiang Xia; Vincent Montigaud; Olivier Cador; Boris Le Guennic; Hongshan Ke; Wenyuan Wang; Gang Xie; Sanping Chen

doi:10.1039/C9CC07552F

Bromine-bridged Dy₂ single-molecule magnet: magnetic anisotropy driven by cis/trans stereoisomers†

Min Li,‡^a Haipeng Wu,‡^a Zhengqiang Xia,*^a Vincent Montigaud,^b Olivier Cador,

^b Boris Le Guennic,

*^b Hongshan Ke,^a Wenyuan Wang,

*^a Gang Xie^a and Sanping Chen

*^a

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* Corresponding authors

^a Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, China
E-mail: northwindy@126.com, wangwy@nwu.edu.cn, sanpingchen@126.com

^b Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, F-35000 Rennes, France
E-mail: boris.leguennic@univ-rennes1.fr

Abstract

We report the first bromine-bridged dinuclear [Dy(Cy₃PO)₂(μ-Br)(Br)₂]₂·2C₇H₈ single-molecule magnet with an effective energy barrier of 684 K and magnetic hysteresis below 3 K. The asymmetric Dy^III centres present two unique stereoisomeric octahedral coordination environments depending on the cis/trans disposition of the Cy₃PO ligands, leading to the orthogonality of the easy magnetic axes that annihilates the dipolar interactions.

Chemical Communications

Bromine-bridged Dy₂ single-molecule magnet: magnetic anisotropy driven by cis/trans stereoisomers†

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Bromine-bridged Dy₂ single-molecule magnet: magnetic anisotropy driven by cis/trans stereoisomers

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