Modulating Single-Molecule Magnetic Behavior of a Dinuclear Erbium(III) Complex by Solvent Exchange

被引：52

作者：

Ge, Jing-Yuan ^{[1
]}

Cui, Long ^{[1
]}

Li, Jing ^{[1
]}

Yu, Fei ^{[1
]}

Song, You ^{[1
]}

Zhang, Yi-Quan ^{[2
]}

Zuo, Jing-Lin ^{[1
]}

Kurmoo, Mohamedally ^{[3
]}

机构：

[1] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Sch Chem & Chem Engn, State Key Lab Coordinat Chem, Nanjing 210023, Jiangsu, Peoples R China

[2] Nanjing Normal Univ, Sch Phys Sci & Technol, Jiangsu Key Lab NSLSCS, Nanjing 210023, Jiangsu, Peoples R China

[3] Univ Strasbourg, Inst Chim Strasbourg, CNRS, UMR 7177, 4 Rue Blaise Pascal, F-67008 Strasbourg, France

来源：

INORGANIC CHEMISTRY | 2017年 / 56卷 / 01期

基金：

中国国家自然科学基金;

关键词：

ION MAGNET; RELAXATION; FIELD; TB; DYNAMICS; SYMMETRY; ANISOTROPY; BLOCKING; BARRIER; DY;

D O I：

10.1021/acs.inorgchem.6b02243

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

[Er-2(thd)(4)Pc]center dot 2C(6)H(6) (1) (Hthd = 2,2,6,6-tetramethylheptanedione), obtained as green crystals from the reaction of [Er(thd)(3)]center dot 2H(2)O with lithium phthalocyanine, Li2Pc, is a stable dinuclear complex with two Er-III centers. Its lattice benzene solvent can be exchanged by soaking the crystals in dichloromethane to give [Er-2(thd)(4)Pc]-2CH(2)Cl(2) (2). The magnetic susceptibility data suggest different coupling interactions for the two complexes. While 1 exhibits fast relaxation and an estimated energy barrier of Ea = 2.6 cm(-1) under 600 Oe dc field, the single-molecule magnet behavior of 2 is field-induced and the energy barrier is higher at 34.3 cm(-1). Ab initio calculations were performed to understand the nature of the coupling interaction between two Er-III ions bridged by the phthalocyanine and the origin of different magnetic behavior. Importantly, the single-molecule magnetic properties can be reversibly tuned through the exchange of solvent molecules, confirmed by further measurements on the complexes 1-re and 2-re. This subtle control of relaxation by lattice solvents is rarely observed in single-molecule magnets, especially for Er-III-based complexes.

引用

页码：336 / 343

页数：8

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