Acta Cryst. (2007). C63, o690-o692 [ doi:10.1107/S0108270107049621 ]
Abstract: The crystal structures of 9-[(E)-(4-nitrophenyl)vinyl]-9H-carbazole and 9-[(E)-(3-nitrophenyl)vinyl]-9H-carbazole, both C20H14N2O2, are determined mainly by van der Waals forces and - interactions between the carbazole and benzene systems. However, the packing modes are different. In the 4-nitro derivative, the molecules in the weakly bound stack are related by a unit-cell translation, while in the 3-nitro derivative there are centrosymmetric pairs of molecules joined by - interactions and also pairs of molecules, related by another centre of symmetry, connected by eight relatively short C-HO interactions.
Formula: Two isomers of C20H14N2O2
Structure factor file (CIF format) (174.6 kbytes)
Structure factor file (CIF format) (122.9 kbytes)
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