ArticleChemical science2026
Curvature-emergent supramolecular polymerization of a porphyrin dyad with a scissor-shaped motif.
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
Curvature has recently emerged as a key structural parameter that dictates the pathway and topology of supramolecular polymerization. We previously showed that scissor-shaped azobenzene dyads, dimerized through a xylylene spacer bearing long alkyl chains, undergo folding-induced self-assembly to yield curvature-derived architectures such as nanorings and nanotubes. Here we extend this scaffold to a bulkier chromophore and demonstrate that the curvature-directed pathway is preserved. Dimerization of tetraphenylporphyrin on the scissor-shaped backbone yields a molecule that, in nonpolar solvents, exhibits a split, bathochromically shifted Soret band. This finding suggests intra- and intermolecular J-type exciton coupling during folding-induced supramolecular polymerization. AFM revealed the formation of helically coiled supramolecular polymers (helicoids). These helicoids evolve into nanotubes over time; applying sonication beforehand induces fragmentation that closes the curved segments into discrete toroids.
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