5,6-Dimethyl-2-(5-methyl­thio­phen-2-yl)-1-[(5-methyl­thio­phen-2-yl)meth­yl]-1H-benzimidazole

The title mol­ecule, C₂₀H₂₀N₂S₂, is T-shaped and consists of a nearly flat 5,6-dimethyl-2-(5-methyl­thio­phen-2-yl)benzimidazole system approximately perpendicular to the 5-methyl­thio­phen-2-ylmethyl substituent. The 5,6-dimethyl-2-(5-meth­yl­thio­phen-2-yl)benzimidazole system is rotationally disordered about the two imidazole N atoms as approximated by a twofold rotation axis with a refined major/minor occupancy ratio of 0.884 (2):0.116 (2). The benzimidazole ring system is essentially planar, the largest deviations being 0.026 (2) and 0.044 (18) Å in the major and minor components, respectively. The inter­planar angles between the benzimidazole unit and the 5-methyl­thio­phen-2-yl substituent are 10.8 (3) and 8(3)° in the major and minor components, respectively, and the corresponding angles with the 5-methyl­thio­phen-2-ylmethyl substituent are 88.12 (8) and 89.5 (4)°. In the crystal, mol­ecules are oriented with their 2-(5-methyl­thio­phen-2-yl)benzimidazole mean planes approximately parallel to (11-3 and appear to be held together by π–π [2-thiophene...imidazole centroid–centroid distance = 4.1383 (7) Å] and C—H...π contacts. A weak C—H...N hydrogen bond generates infinite chains parallel to [100].