Acta Cryst. (2013). C69, 1073-1076 [ doi:10.1107/S0108270113022142 ]
Synopsis: Two basic heterocyclic imino structures display a planar backbone with similar features, but differ in the heterocyclic atoms located in the five-membered rings, i.e. N and S. In the pyrrole, centrosymmetric iminopyrrole dimers are assembled by means of two inverted N-HN hydrogen bonds and two inverted C-H interactions. In the thiophene, however, molecules are linked by nonclassical C-HN hydrogen bonds in which the molecules play the roles of both hydrogen-bond donors and acceptors, resulting in one-dimensional supramolecular chains.
Formula: C14H16N2 and C14H15NS
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