Acta Cryst. (2007). C63, o734-o738 [ doi:10.1107/S0108270107053206 ]
Abstract: The title compounds, namely (2Z)-1-(4-bromophenyl)-2-(pyrrolidin-2-ylidene)ethanone, C12H12BrNO, (I), (2Z)-1-(4-bromophenyl)-2-(piperidin-2-ylidene)ethanone, C13H14BrNO, (II), and (2Z)-2-(azepan-2-ylidene)-1-(4-bromophenyl)ethanone, C14H16BrNO, (III), are characterized by bifurcated intra- and intermolecular hydrogen bonding between the secondary amine and carbonyl groups. The former establishes a six-membered hydrogen-bonded ring, while the latter leads to the formation of centrosymmetric dimers. Weak C-HBr interactions link the individual molecules into chains that run along the ,  and  directions in (I)-(III), respectively. Additional weak BrO, C-H and C-HO interactions further stabilize the crystal structures.
Formula: C12H12BrNO, C13H14BrNO and C14H16BrNO
Structure factor file (CIF format) (124.9 kbytes)
Structure factor file (CIF format) (139.6 kbytes)
Structure factor file (CIF format) (149.2 kbytes)
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