Thermal and magnetic field switching in a two-step hysteretic MnIII spin crossover compound coupled to symmetry breakings

Dobbelaar, Emiel, Jakobsen, Vibe B., Trzop, Elzbieta, Lee, Minseong, Chikara, Shalinee, Ding, Xiaxin, Müller-Bunz, Helge, Esien, Kane, Felton, Solveig, Carpenter, Michael A., Collet, Eric, Morgan, Grace G. and Zapf, Vivien S. 2022. Thermal and magnetic field switching in a two-step hysteretic MnIII spin crossover compound coupled to symmetry breakings. Angewandte Chemie International Edition 61 (4) , e202114021. 10.1002/anie.202114021

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Abstract

A MnIII spin crossover complex with atypical two-step hysteretic thermal switching at 74 K and 84 K shows rich structural–magnetic interplay and magnetic-field-induced spin state switching below 14 T with an onset below 5 T. The spin states, structures, and the nature of the phase transitions are elucidated via X-ray and magnetization measurements. An unusual intermediate phase containing four individual sites, where urn:x-wiley:14337851:media:anie202114021:anie202114021-math-0001 are in a pure low spin state, is observed. The splitting of equivalent sites in the high temperature phase into four inequivalent sites is due to a structural reorganization involving a primary and a secondary symmetry-breaking order parameter that induces a crystal system change from orthorhombic→monoclinic and a cell doubling. Further cooling leads to a reconstructive phase transition and a monoclinic low-temperature phase with two inequivalent low-spin sites. The coupling between the order parameters is identified in the framework of Landau theory.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Wiley
ISSN:	1433-7851
Date of First Compliant Deposit:	26 January 2023
Date of Acceptance:	10 November 2021
Last Modified:	03 May 2023 08:15
URI:	https://orca.cardiff.ac.uk/id/eprint/156290

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