Spin-crossover iron(ii) complexes featuring boronic acid and boronic ester groups: synthesis and magnetic properties

Zhang M, Heinemann FW, Khusniyarov M (2026)

Publication Type: Journal article

Publication year: 2026

Journal

CrystEngComm Royal Society of Chemistry

DOI: 10.1039/d6ce00062b

Abstract

A series of bis(pyrazol-1-yl)pyridine (BPP) iron(ii) complexes bearing either boronic acid or boronic monoester groups, with the general formula [FeII(BPP)2](ClO4)2, have been synthesized and characterized in the solid state. The boronic acid or boronic monoester substituents are introduced at the 4-position of the pyridine ring. Despite their close structural similarity, the complexes exhibit markedly different magnetic properties. Complex 1a, which contains boronic acid groups, undergoes an incomplete, thermally induced spin-crossover in the solid state. Conversion of the boronic acid groups into monomethyl or monoethyl esters stabilizes the high-spin state in 1b and 1c, respectively. Further substitution with electron-donating tert-butyl groups in 2b enforces a pure low-spin state.

Authors with CRIS profile

Minghui Zhang Naturwissenschaftliche Fakultät Frank Wilhelm Heinemann Lehrstuhl für Anorganische und Allgemeine Chemie Marat Khusniyarov Department Chemie und Pharmazie

How to cite

APA:

Zhang, M., Heinemann, F.W., & Khusniyarov, M. (2026). Spin-crossover iron(ii) complexes featuring boronic acid and boronic ester groups: synthesis and magnetic properties. CrystEngComm. https://doi.org/10.1039/d6ce00062b

MLA:

Zhang, Minghui, Frank Wilhelm Heinemann, and Marat Khusniyarov. "Spin-crossover iron(ii) complexes featuring boronic acid and boronic ester groups: synthesis and magnetic properties." CrystEngComm (2026).

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