Issue 22, 2022

New family of Hofmann-like coordination polymers constructed with imidazole ligands and associated with spin crossover and anisotropic thermal expansions

Abstract

Instead of the conventionally utilized pyridine derivatives ligands for the Hofmann-like spin crossover (SCO) structure, here we used five-membered-aromatic-ring ligands to afford a new series of Hofmann-like compounds Fe(L)2[Ni(CN)4] (L = imidazole (1), 1-methylimidazole (2)). The synthesis, crystal structures, magnetic properties and thermal variation of the lattice constants for 1 and 2 were studied. The structures of the currently synthesized compounds were, as expected, found to be similar to that of traditional Hofmann-like 2D layer structure. Compound 1 showed a high spin state at all temperatures, while compound 2 displayed strong cooperative SCO centered at 144 K accompanied by a 35.2 K-wide hysteresis loop. Interestingly, compound 2 clearly showed anisotropic thermal expansion behaviour.

Graphical abstract: New family of Hofmann-like coordination polymers constructed with imidazole ligands and associated with spin crossover and anisotropic thermal expansions

Supplementary files

Article information

Article type
Communication
Submitted
15 Feb 2022
Accepted
19 Apr 2022
First published
06 May 2022

New J. Chem., 2022,46, 10540-10544

New family of Hofmann-like coordination polymers constructed with imidazole ligands and associated with spin crossover and anisotropic thermal expansions

T. Kosone, R. Kosuge, M. Tanaka, T. Kawasaki and N. Adachi, New J. Chem., 2022, 46, 10540 DOI: 10.1039/D2NJ00766E

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