Acta Cryst. (2013). C69, 522-525 [ doi:10.1107/S0108270113007889 ]
Abstract: The title isomers, namely 3-chloro-N-[1-(1H-pyrrol-2-yl)ethylidene]aniline, (I), and 4-chloro-N-[1-(1H-pyrrol-2-yl)ethylidene]aniline, (II), both C12H11ClN2, differ in the position of the chlorine substitution. Both compounds have the basic iminopyrrole structure, which shows a planar backbone with similar features. The dihedral angle formed by the planes of the pyrrole and benzene rings is 75.65 (7)° for (I) and 86.56 (8)° for (II). The H atom bound to the pyrrole N atom is positionally disordered and partial protonation occurs at the imino N atom in (I), while this phenomenon is absent from the structure of (II). Packing interactions for both compounds include intermolecular N-HN hydrogen bonds and C-H interactions, forming centrosymmetric dimers for both (I) and (II).
Formula: Two isomers of C12H11ClN2
Structure factor file (CIF format) (110.0 kbytes)
Structure factor file (CIF format) (111.8 kbytes)
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