A biphenyl-spaced bis-pyrazolylpyridine ligand interacts with ferrous ions to engender a dimetallic helical coordination cage that encapsulates an Fe3+ tris-anilate complex. The host-guest interaction breaks the symmetry of the Fe2+ centers causing a differential spin crossover behavior in them that can be followed in great detail crystallographically.
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Barrios, L. A., Teat, S. J., Roubeau, O., & Aromí, G. (2023). A supramolecular helicate with two independent Fe(ii) switchable centres and a [Fe(anilate)3]3− guest. Chemical Communications, 59(71), 10628–10631. https://doi.org/10.1039/d3cc02278a