Abstract
Over the past few decades, the tren [tris(2-aminoethyl)amine] skeleton has materialized as one of the supreme anion binding building blocks demonstrating a strong interplay among topology, complementarity, cooperativity, and coordination. However, anion recognition by modest tren-based unsubstituted aromatic urea has been underexplored, mainly due to the deficiency of π-acidic or electron-withdrawing aryl terminals. This report establishes an infrequent hexameric neutral receptor-anion-water molecular self-assembly, where a conformationally flexible C3v-symmetric halide (F–/Cl–) encapsulated electron-rich naphthyl group containing N-bridged tripodal urea receptor effectively entraps a chair-shaped ice-like neutral cyclic water hexamer within the hexameric cavity of a neutral receptor-halide host–guest assembly.
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