A mononuclear five-coordinate Co(II) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states

Lei Chen; Jingbo Song; Wen Zhao; Gangji Yi; Zhikuan Zhou; Aihua Yuan; You Song; Zhenxing Wang; Zhong-Wen Ouyang

doi:10.1039/C8DT03783C

A mononuclear five-coordinate Co(ii) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states†

Lei Chen,^a Jingbo Song,^a Wen Zhao,^a Gangji Yi,^a Zhikuan Zhou,

^a Aihua Yuan,

*^a You Song,

*^b Zhenxing Wang

^c and Zhong-Wen Ouyang^c

Author affiliations

* Corresponding authors

^a School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
E-mail: aihua.yuan@just.edu.cn

^b State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China
E-mail: yousong@nju.edu.cn

^c Wuhan National High Magnetic Field Center & School of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China

Abstract

Although a great number of single-ion magnets (SIMs) and spin-crossover (SCO) compounds have been discovered, multifunctional materials with the combination of SCO and SIM properties are extremely scarce. Here magnetic studies have been carried out for a mononuclear, five-coordinate cobalt(II) complex [Co(3,4-lut)₄Br]Br (1) with square pyramidal geometry. Direct-current magnetic measurement confirms the spin transition between the S = 1/2 and 3/2 states in the range of 150–290 K with a small hysteresis loop. Frequency- and temperature-dependent alternating-current magnetic susceptibility reveals slow magnetization relaxation under an applied dc field of 3000 Oe. The work here presents the first instance of the five-coordinate mononuclear cobalt(II)-based SIM exhibiting the thermally induced complete SCO.

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DOI: https://doi.org/10.1039/C8DT03783C
Article type: Paper
Submitted: 19 Sep 2018
Accepted: 23 Oct 2018
First published: 23 Oct 2018

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Dalton Trans., 2018,47, 16596-16602

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A mononuclear five-coordinate Co(II) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states

L. Chen, J. Song, W. Zhao, G. Yi, Z. Zhou, A. Yuan, Y. Song, Z. Wang and Z. Ouyang, Dalton Trans., 2018, 47, 16596 DOI: 10.1039/C8DT03783C

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Dalton Transactions

A mononuclear five-coordinate Co(ii) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states†

Abstract

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A mononuclear five-coordinate Co(II) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states

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