A pyrazolyl urea ligand adopts two possible conformations with the urea NH groups directed either outward or inward. Metal coordination enforces the outward conformation resulting in either anion complexation or self-association and hence extended supramolecular assemblies including a hexameric barrel that persists in solution.
G. O. Lloyd and J. W. Steed, Chem. Commun., 2014, 50, 1426 DOI: 10.1039/C3CC48603F
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