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Solid-state self-assembly of a calix[4]pyrrole-resorcinarene hybrid into a hexameric cage.

The solid-state packing of a two-component mixture consisting of the α,α,α,α steroisomer of a calix[4]pyrrole resorcinarene hybrid and tetramethylammonium chloride is controlled by the relative stoichiometry of the mixture in solution. The use of a high molar excess of the ammonium salt induces, in the solid state, a self-assembly process of the calix[4]pyrrole into a supramolecular hexameric structure that corresponds to an octahedron.