Rational direct synthesis of [Fe(Htrz)2(trz)](BF4) polymorphs: temperature and concentration effects

Marlène Palluel; Liza El Khoury; Nathalie Daro; Sonia Buffière; Michael Josse; Mathieu Marchivie; Guillaume Chastanet

doi:10.1039/D1QI00482D

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Rational direct synthesis of [Fe(Htrz)₂(trz)](BF₄) polymorphs: temperature and concentration effects†

Marlène Palluel,^a Liza El Khoury,^a Nathalie Daro,^a Sonia Buffière,^a Michael Josse,^a Mathieu Marchivie*^a and Guillaume Chastanet

*^a

Author affiliations

* Corresponding authors

^a CNRS, University of Bordeaux, Bordeaux INP, UMR 5026, 87 avenue du Dr. A. Schweitzer, F-33600 Pessac, France
E-mail: mathieu.marchivie@icmcb.cnrs.fr, guillaume.chastanet@icmcb.cnrs.fr

Abstract

The [Fe(Htrz)₂trz](BF₄) compound is probably the most studied in the spin crossover (SCO) community since it exhibits switching properties with a large temperature range of memory effect, just above room temperature. We present in this paper a detailed study of the influence of the synthetic parameters on the polymorphism of this compound. While the crystal structure of polymorph I is already known, we report the crystal structure of polymorph II and discuss the differences to allow further studies to discriminate between the two. This was achieved through the resolution of the crystal structure of the [Fe(Htrz)₂(trz)](PF₆) analogue. This study allows us to draw a phase diagram and to discuss the effect of the reaction conditions on the formation of polymorphs, the size of the particles and their properties.

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Article information

DOI: https://doi.org/10.1039/D1QI00482D
Article type: Research Article
Submitted: 13 Apr 2021
Accepted: 08 Jun 2021
First published: 09 Jun 2021

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Inorg. Chem. Front., 2021,8, 3697-3706

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Rational direct synthesis of [Fe(Htrz)₂(trz)](BF₄) polymorphs: temperature and concentration effects

M. Palluel, L. El Khoury, N. Daro, S. Buffière, M. Josse, M. Marchivie and G. Chastanet, Inorg. Chem. Front., 2021, 8, 3697 DOI: 10.1039/D1QI00482D

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