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Acta Cryst. (2013). C69, 1073-1076  [ doi:10.1107/S0108270113022142 ]

3,4-Dimethyl-N-[1-(1H-pyrrol-2-yl)ethyl­idene]aniline and the 1-(1-thio­phen-2-yl) analogue

B.-Y. Su, J.-X. Wang, X. Liu and Q.-D. Li

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-H...N hydrogen bonds and two inverted C-H...[pi] inter­actions. In the thio­phene, however, mol­ecules are linked by nonclassical C-H...N 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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