Chemical disorder and spin crossover in a mixed ethanol–2-propanol solvate of FeII tris(2-picolylamine) dichloride

Dmitry Chernyshov; Brita Vangdal; Karl Wilhelm Törnroos; Hans-Beat Bürgi

doi:10.1039/B823514G

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Chemical disorder and spin crossover in a mixed ethanol–2-propanol solvate of Fe^II tris(2-picolylamine) dichloride†

Dmitry Chernyshov,*^a Brita Vangdal,^b Karl Wilhelm Törnroos^b and Hans-Beat Bürgi^c

Author affiliations

* Corresponding authors

^a Swiss Norwegian Beamlines at European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, France
E-mail: dmitry.chernyshov@esrf.fr

^b Department of Chemistry, University of Bergen, Norway

^c Department of Chemistry and Biochemistry, University of Berne, Switzerland

Abstract

We compare the macroscopic and magnetic properties of three spin crossover compounds, [Fe^II(2-pic)₃]Cl₂·EtOH, [Fe^II(2-pic)₃]Cl₂·2-PrOH and [Fe^II(2-pic)₃]Cl₂·(EtOH)_0.744·(2-PrOH)_0.256 (pic = picolylamine), with their crystal structures in high-spin, low-spin and photoexcited high-spin states. We show that the spin conversion process is affected not only by the presence of solvent molecules in the crystal structure, but also by their occupational disorder in the mixed ethanol–2-propanol solvate. The solvent mixture induces a new spin crossover scenario, in which intermediate ordering of spin states is suppressed, the transition temperature is shifted and cooperativity is reduced relative to the parent, pure ethanol and 2-propanol, solvates.

This article is part of the themed collection: 3rd International Symposium on Molecular Materials (MOLMAT)

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Supplementary files

Crystal structure data TXT (103K)

Article information

DOI: https://doi.org/10.1039/B823514G
Article type: Paper
Submitted: 05 Jan 2009
Accepted: 03 Mar 2009
First published: 14 Apr 2009

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New J. Chem., 2009,33, 1277-1282

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Chemical disorder and spin crossover in a mixed ethanol–2-propanol solvate of Fe^II tris(2-picolylamine) dichloride

D. Chernyshov, B. Vangdal, K. W. Törnroos and H. Bürgi, New J. Chem., 2009, 33, 1277 DOI: 10.1039/B823514G

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