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The title carbazole derivative, C13H9NO, crystallizes with two independent molecules (A and B) in the asymmetric unit. The dihedral angle between the planar carbazole ring system and the aldehyde group (HC=O) is 3.3 (2)° in A and 7.5 (2)° in B, indicating that the molecules are both nearly planar. In the crystal, the A and B molecules are linked by a C—H...O hydrogen bond and stack along the b-axis direction. The structure was refined as a two component twin with a refined BASF value of 0.102 (2).