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

In the title mol­ecule, C₁₉H₁₃FN₂, the benzimidazole unit is close to planar [maximum deviation = 0.0342 (9) Å] and forms dihedral angles of 58.94 (3) and 51.43 (3)° with the phenyl and fluoro­benzene rings, respectively; the dihedral angle between the phenyl and fluoro­benzene rings is 60.17 (6)°. In the crystal, three C—H...F hydrogen bonds and two weak C—H...π inter­actions involving the fused benzene ring lead to a three-dimensional architecture.

1,2-Diphenyl-1H-benzimidazole

In the title mol­ecule, C₁₉H₁₄N₂, the benzimidazole unit is close to being planar [maximum deviation = 0.0102 (6) Å] and forms dihedral angles of 55.80 (2) and 40.67 (3)° with the adjacent phenyl rings; the dihedral angle between the phenyl rings is 62.37 (3)°. In the crystal, one C—H...N hydrogen bond and three weak C—H...π inter­actions involving the fused benzene ring and the imidazole ring are observed, leading to a three-dimensional architecture.