In the title compound, C15H13N3O·H2O, the dihedral angle between the pyridine and phenyl rings is 35.45 (7)°. Intermolecular O—H⋯O, O—H⋯N, N—H⋯O and C—H⋯O hydrogen bonds are found in the crystal structure. In addition, C—H⋯π interactions involving the pyridine and phenyl rings are also found.
The title compound, C21H17N3O2, crystallizes with two molecules in the asymmetric unit. The carbazole groups show relatively small deviations from planarity [maximum displacements from the mean carbazole plane are 0.077 (7) and 0.101 (7) Å]. The dihedral angles between the 3-nitrobenzylideneamine and carbazole groups are 37.9 (1) and 37.0 (1)° in the two molecules.
In the title compound, C22H17N3, the 1H-indole unit is essentially planar, with a dihedral angle of 0.95 (10)° between the pyrrole ring and the fused benzene ring. The dihedral angle between the two phenyl rings is 65.09 (10)°. In the crystal, an intermolecular N—H⋯N hydrogen bond forms an infinite chain in the b-axis direction.
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