Thermal and Magnetic Field Switching in a Two-Step Hysteretic MnIII Spin Crossover Compound Coupled to Symmetry Breakings

Emiel Dobbelaar, Vibe B. Jakobsen, Elzbieta Trzop, Minseong Lee, Shalinee Chikara, Xiaxin Ding, Helge Müller-Bunz, Kane Esien, Solveig Felton, Michael A. Carpenter, Eric Collet, Grace G. Morgan, Vivien S. Zapf

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26 Scopus citations

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 (Formula presented.) 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.

Original languageEnglish
Article numbere202114021
JournalAngewandte Chemie - International Edition
Volume61
Issue number4
DOIs
StatePublished - Jan 21 2022

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