Abstract
The fab four: Aminopyrazolones which incorporate two ditopic hydrogen-bond donor–acceptor pairs of amide and amidine functional groups can self-assemble through formation of four hydrogen bonds. Single-crystal X-ray diffraction analysis reveals that homomeric aggregation (amide–amide, amidine–amidine) affords 1D architectures while heteromeric aggregation (amide–amidine) generates macrocyclic quartets (see picture).
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