ArticleChemical science2026
Guest-dependent solid-state superstructure plasticity and its application to adsorptive benzene sieving.
Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Conformational plasticity offers a powerful route to adaptive molecular materials, yet its translation into guest-dependent superstructures with controllable function remains rare in the case of synthetic macrocycles. Here we show that two conformationally adaptive macrocycles, MeC3 and MeC4, provide a well-defined macrocyclic platform for investigating guest-dependent conformational plasticity in the solid-state. Specifically, supramolecular co-assembly of MeC3 with molecular guests that differ in geometry, polarity and electronic character affords a diverse set of guest-dependent macrocyclic polymorphs and higher-order solid-state host-guest superstructures. Combined spectroscopic, computational, and crystallographic analyses correlate guest identity with the stabilization of distinct macrocyclic conformations that then propagate into divergent packing modes and superstructures. As a presumed consequence of the adaptive solid-state behavior, MeC3 crystals selectively sieve benzene vapor from benzene/cyclohexane mixtures with >95% selectivity. The MeC3 sieve material can be readily regenerated through a reversible guest-loaded to guest-free crystal-to-crystal transformation. In contrast to MeC3, MeC4 proved effective as a solid-state receptor for fullerenes C
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