2-(1-Phenyl-1H-benzimidazol-2-yl)phenol

In the title mol­ecule, C₁₉H₁₄N₂O, the benzimidazole unit is close to being planar [maximum deviation = 0.0253 (11) Å] and forms dihedral angles of 68.98 (6) and 20.38 (7)° with the adjacent phenyl and benzene rings; the dihedral angle between the latter two planes is 64.30 (7)°. An intra­molecular O—H...N hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked by C—H...N and C—H...O hydrogen bonds, and consolidated into a three-dimensional architecture by π–π stacking inter­actions, with a centroid–centroid distance of 3.8428 (12) Å.

1-Phenyl-2-[4-(trifluoro­meth­yl)phen­yl]-1H-benzimidazole

In the title mol­ecule, C₂₀H₁₃F₃N₂, the benzimidazole unit is close to being planar [maximum deviation = 0.012 (1) Å] and forms dihedral angles of 31.43 (7) and 61.45 (9)° with the 4-(trifluoromethyl)phenyl and 1-phenyl rings, respectively; the dihedral angle between these rings is 60.94 (10)°. In the crystal, C—H...F hydrogen bonds link the mol­ecules into chains along the c-axis direction. The CF₃ group is rotationally disordered with an occupancy ratio of 0.557 (8):0.443 (8) for the F atoms.

2-(4-Meth­oxy­phen­yl)-1-phenyl-1H-benzimidazole

In the title compound, C₂₀H₁₆N₂O, the 1H-benzimidazole ring forms dihedral angles of 48.00 (6) and 64.48 (6)°, respectively with the benzene and phenyl rings, which are inclined to one another by 58.51 (7)°. In the crystal, weak C—H...π inter­actions are the only inter­molecular inter­actions present.

1-Phenyl-2-p-tolyl-1H-benzimidazole

In the title compound, C₂₀H₁₆N₂, the benzimidazole ring system forms dihedral angles of 28.50 (7) and 72.44 (7)° with the tolyl and phenyl rings, respectively. In the crystal, mol­ecules are linked into chains along the a-axis direction by weak C—H...N inter­actions. The crystal structure also features C—H...π inter­actions.