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The mol-ecule of the title compound, C(18)H(19)N(3)O, displays a trans configuration with respect to the C=N double bond. There is a strong intra-molecular O-H⋯N hydrogen-bonding inter-action between the hydr-oxy group and imine N atom. The dihedral angle between the aromatic rings is 30.35 (8)°. The crystal packing is stabilized by O-H⋯N links.

In the mol-ecule of the title compound, C(28)H(32)N(2), the benzimidazole ring system is almost planar [maximum deviation = 0.0221 (15) Å] and forms dihedral angles of 85.86 (4) and 32.09 (6)° with the benzene rings. In the crystal structure, mol-ecules are linked into chains running parallel to the a axis by inter-molecular C-H⋯N hydrogen bonds. The methyl groups of a tert-butyl group are rotationally disordered over two positions with refined site-occupancy factors of 0.636 (4) and 0.364 (4).

The mol-ecule of the title compound, C(15)H(12)N(2)O(2), displays a trans configuration with respect to the C=N double bond. The dihedral angle between the two benzene rings is 30.46 (14)°. A strong intra-molecular O-H⋯O hydrogen bond stabilizes the mol-ecular structure.

The title compound, C(18)H(12)N(2)O, crystallizes in a phenol-imine tautomeric form with a Z conformation for the imine functionality. The dihedral angle between the aromatic rings is 8.98 (9)°. A strong intra-molecular O-H⋯N hydrogen-bond inter-action between the hydroxyl group and imine N atom occurs.

In the mol-ecule of the title compound, C(15)H(12)N(2)O(2), the aromatic rings are oriented at a dihedral angle of 28.11 (3)°. Intra-molecular O-H⋯N hydrogen bonding results in the formation of a planar six-membered ring, which is nearly coplanar with the adjacent ring at a dihedral angle of 1.53 (3)°. In the crystal structure, π-π contacts between the benzene rings [centroid-centroid distance = 3.841 (1) Å] may stabilize the structure.