Dianiline-Diphenol Molecular Complexes Based on Supraminol Recognition

Dianilines and diphenols form well-defined crystalline molecular complexes that arise from
complementary O−H···N and N−H···O recognition. The crystal structures of four such 1:1 complexes 1, 2, 3 and 4
based on diphenylmethane frameworks are reported and discussed. Three supramolecular synthons are found, the
N(H)O based square motif and infinite chain, already reported, and a new cyclohexane chair consisting of N(H)O,
O−H···O and N−H···N hydrogen bridges. The replacement of a −CH2− group by an S-atom leads in two cases to
little change in the crystal structure and in another to a complete change. It is possible that the dianiline component
plays a more important role in molecular recognition in these complexes than does the diphenol component.