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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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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.

Graphical abstract: 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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Publication details

The article was received on 19 Sep 2018, accepted on 23 Oct 2018 and first published on 23 Oct 2018


Article type: Paper
DOI: 10.1039/C8DT03783C
Citation: Dalton Trans., 2018, Advance Article
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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, Advance Article , DOI: 10.1039/C8DT03783C

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