Spin crossover of a Fe(II) mononuclear complex induced by intermolecular factors involving chloride and solvent ordering

Kenneth Zhang; Matthew J. Wallis; Alexander R. Craze; Shinya Hayami; Hyunsung Min; Daniel J. Fanna; Mohan M. Bhadbhade; Ruoming Tian; Christopher E. Marjo; Leonard F. Lindoy; Feng Li

doi:10.1039/D4DT00706A

Spin crossover of a Fe(ii) mononuclear complex induced by intermolecular factors involving chloride and solvent ordering†

Kenneth Zhang,‡^a Matthew J. Wallis,‡^a Alexander R. Craze,^b Shinya Hayami,

^c Hyunsung Min,^ad Daniel J. Fanna,^d Mohan M. Bhadbhade,^e Ruoming Tian,^e Christopher E. Marjo,

^e Leonard F. Lindoy^f and Feng Li

*^a

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* Corresponding authors

^a School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia
E-mail: Feng.Li@westernsydney.edu.au

^b Department of Chemistry, University of Oxford, Oxford OX1 3TA, UK

^c Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Japan

^d Advanced Materials Characterisation Facility, Western Sydney University, Locked Bag 1797, Penrith, NSW, Australia

^e Mark Wainwright Analytical Centre, University of New South Wales, Kensington, NSW, Australia

^f School of Chemistry, The University of Sydney, NSW 2006, Australia

Abstract

Two new salts of a mononuclear tripodal Fe(II) complex were prepared, using ClO₄⁻ and Cl⁻. The ClO₄⁻ sample (1) remained HS at low temperatures, similar to the previously reported BF₄⁻ analogue. Crystallising with the Cl⁻ anion (2) led to a markedly different crystal packing arrangement, and engendered SCO activity. This has been correlated to the lower crystal packing density in 2 and the coordination complex conformational differences arising due to the packing motifs of 1 and 2. Further, solvent ordering effects have been proposed to facilitate spin transition behaviour in 2.

This article is part of the themed collections: Articles behind our 2024 journal covers and Recent progress and perspectives on spin transition compounds

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Spin crossover of a Fe(ii) mononuclear complex induced by intermolecular factors involving chloride and solvent ordering†

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Spin crossover of a Fe(II) mononuclear complex induced by intermolecular factors involving chloride and solvent ordering

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