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Issue 3, 2017
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Switchable slow relaxation of magnetization in the native low temperature phase of a cooperative spin-crossover compound

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Abstract

The implementation of single-molecule magnet properties in spin crossover materials is sought as a unique source of magnetic multistability at the molecular level. Examples however remain extremely scarce, in part due to the diamagnetic state of most Fe(II) spin crossover materials at low temperatures. We have studied the complex [Fe(mtz)6](CF3SO3)2 (mtz = 1-methyltetrazole) as a tantalizing candidate of such coexistence, due to its known partial spin crossover and therefore paramagnetic native low temperature phase. The single-crystal structures of [Fe(mtz)6](CF3SO3)2 reported here allow rationalizing its peculiar cooperative spin-crossover behavior. Importantly, the high-spin Fe crystallographic sites at low temperature exhibit a high symmetry with a local trigonal distortion, usually source of magnetic anisotropy. The analysis of equilibrium magnetic properties confirm the presence of a significant magnetic anisotropy at the Fe(II) high spin sites in the high symmetry low temperature phase. This results in field-induced slow relaxation of their magnetization which is dominated at low temperature by tunneling and direct processes and is strongly enhanced above 3 K by Raman and Orbach processes. Unprecedentedly, these single-molecule magnet properties are observed in the native ground state of a spin crossover material and efficiently and reversibly switched OFF through visible light irradiation.

Graphical abstract: Switchable slow relaxation of magnetization in the native low temperature phase of a cooperative spin-crossover compound

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Publication details

The article was received on 24 Oct 2016, accepted on 09 Dec 2016 and first published on 19 Dec 2016


Article type: Edge Article
DOI: 10.1039/C6SC04737H
Citation: Chem. Sci., 2017,8, 2290-2295
  • Open access: Creative Commons BY-NC license
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    Switchable slow relaxation of magnetization in the native low temperature phase of a cooperative spin-crossover compound

    A. Urtizberea and O. Roubeau, Chem. Sci., 2017, 8, 2290
    DOI: 10.1039/C6SC04737H

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