Desolvation-driven thermal spin crossover in a Fe(II) complex incorporating the anthracene-2-sulfonate anion

Wang, Mengmeng;Wolff, Mariusz;Yadav, Jyoti;Pinkowicz, Dawid;Garcia, Yann
(2025) Interactions — Vol. 246, n° 1, p. 117 (2025)

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Abstract
Anions containing sulfonate groups are widely used in the construction of spin crossover complexes. In this work, we synthesized a new Fe(II) salt, [Fe(H2O)6](2-As)2, featuring the anthracene-2-sulfonate (2-As⁻) anion, which can be used to study the influence of anion photodimerization on the spin state. Using this salt as a precursor, we obtained a Fe(II) mononuclear complex [Fe(3-bpp)2](2-As)2·2MeOH·H2O (1, 3-bpp = 2,6-di(pyrazol-3-yl)pyridine). 57Fe Mössbauer spectroscopy and magnetic measurements revealed that 1 is in the low-spin state in its solvated form but undergoes a gradual and incomplete spin crossover upon desolvation, with a narrow thermal hysteresis around 290 K.
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Wang, M., Wolff, M., Yadav, J., Pinkowicz, D., & Garcia, Y. (2025). Desolvation-driven thermal spin crossover in a Fe(II) complex incorporating the anthracene-2-sulfonate anion. Interactions, 246(1), 117. https://doi.org/10.1007/s10751-025-02338-0 (Original work published 2025)