Synthesis and crystal structure of 1-hy-droxy-8-methyl-9H-carbazole-2-carbaldehyde.

Two crystallographically independent mol-ecules are present in the asymmetric unit of the title compound, C(14)H(11)NO(2), with virtually identical geometries. The carbazole units are planar. The hy-droxy group at position 1, carbaldehyde group at position 2, and methyl group at position 8 (with the exception of two H atoms) are coplanar with the attached benzene rings. The dihedral angle between the two benzene rings is 2.20†(9)° in mol-ecule A and 2.01†(9)° in mol-ecule B. The pyrrole ring makes dihedral angles of 0.82†(10) and 1.40†(10)° [0.84†(10) and 1.18†(10)° in mol-ecule B] with the (-CH(3))-substituted and (-OH and -CHO) substituted benzene rings, respectively. The mol-ecular structure is stabilized by the intra-molecular O-H⋯O hydrogen bonds, while the crystal structure features N-H⋯O and C-H⋯O hydrogen bonds. A range of π-π contacts further stabilizes the crystal structure.