Issue 18, 2024

Hydrogen-bonded assemblies of iron(ii) spin crossover complexes

Abstract

The paper reports on the synthesis, crystal structure, thermal and magnetic properties of spin crossover (SCO) salts containing the [Fe(bpp)2]2+ cation (bpp = 2,6-bis(pyrazol-3-yl)pyridine) and different rigid polycarboxylate anions, such as anthracene-9,10-dicarboxylate (ADC), benzene-1,3,5-tricarboxylate (BTC) and biphenyl-4,4′-dicarboxylate (BPDC). Compound [Fe(bpp)2](ADC)·9H2O (1) shows a porous hydrogen-bonded structure with water molecules sitting in the channels. It contains low-spin (LS) Fe2+ cations that undergo crossover to the high-spin (HS) state upon dehydration. Anhydrous 1 remains HS on cooling at low temperatures. A similar magnetic behaviour is obtained for the partially protonated BTC salt [Fe(bpp)2](HBTC)·5H2O (2), showing a spin change concomitant with dehydration to a HS phase that undergoes gradual and partial SCO on cooling, affecting 25% of the Fe2+ cations. Instead, the BPDC salt [Fe(bpp)2](BPDC)·5H2O (3) has a ground HS state in its fully hydrated form.

Graphical abstract: Hydrogen-bonded assemblies of iron(ii) spin crossover complexes

Supplementary files

Article information

Article type
Paper
Submitted
27 feb 2024
Accepted
08 apr 2024
First published
09 apr 2024
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2024,53, 7848-7856

Hydrogen-bonded assemblies of iron(II) spin crossover complexes

V. Jornet-Mollá, M. I. Rodríguez-Tarrazó, M. J. Dolz-Lozano, C. Giménez-Saiz and F. M. Romero, Dalton Trans., 2024, 53, 7848 DOI: 10.1039/D4DT00579A

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