Crystal engineering of p-sulfocinnamic acid into mononuclear cationic Fe(ii), Co(ii) and Fe(iii) complexes
(2026) CrystEngComm — Vol. 28, n° 22, p. 3449-3457 (2026)
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- Authors
Li, Xiaochun 
Wang, Mengmeng Draoui, Youssef
- Abstract
- In this work, we report the synthesis of two new Co(II) metal salts [Co(H2O)6](Hpsca)2·nH2O (n = 2, 4) incorporating a p-sulfocinnamic acid counter anion (Hpsca−). Together with the previously reported iron(II) analogue [Fe(H2O)6](Hpsca)2·2H2O, these precursors were utilized to synthesize four new coordination complexes [M(bipy)3](Hpsca)2·2MeOH (M = Fe (1), Co (2), bipy = 2,2′-bipyridine), [Fe(1-bpp)(Hpsca)(H2O)(MeOH)]Hpsca·MeOH (3, 1-bpp = 2,6-di(1-pyrazolyl)pyridine) and [Fe(3,2,3-sal2tet)]Hpsca·H2O (4), 3,2,3-sal2tet = 2,2′-((1Z,13Z)-2,6,9,13-tetraazatetradeca-1,13-diene-1,14-diyl) diphenol. Single crystal X-ray diffraction analyses revealed that all complexes consist of discrete mononuclear cationic units, while the Hpsca− anion forms different supramolecular arrangements. 57Fe Mössbauer spectroscopy confirms the low-spin state for Fe(II) ions in 1 and Fe(III) ions in 4, in accordance with crystallographic results. This work highlights the versatility of the Hpsca− counteranion to stabilize diverse crystal architectures as well as its ability to couple solid-state reactivity and spin state modulation, thanks to the potential anion-driven light induced spin change based on the solid state [2 + 2] photodimerization of Hpsca−.
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Citations
Li, X., Wong, J. W. L., Wang, M., Draoui, Y., Wolff, M., Robeyns, K., Rotaru, A., & Garcia, Y. (2026). Crystal engineering of p-sulfocinnamic acid into mononuclear cationic Fe(ii), Co(ii) and Fe(iii) complexes. CrystEngComm, 28(22), 3449-3457. https://doi.org/10.1039/D6CE00068A (Original work published 2026)