2-[(1Z)-(9-Ethyl-9H-carbazol-3-yl)methyl­eneamino]-4,5,6,7-tetra­hydro-1-benzothio­phene-3-carbonitrile–benzene (2/1)

In the title compound, 2C(24)H(21)N(3)S·C(6)H(6), the two independent Schiff base mol-ecules (A and B) in the asymmetric unit differ in the orientation of the tetra-hydro-benzothio-phene ring system with respect to the carbazole ring system by 180° rotation about the C-C bond in the C-C=N-C linkage. The two mol-ecules also differ in the orientation of the ethyl groups [C-N-C-C torsion angle of 90.7 (3)° in mol-ecule A, and -79.4 (3)° in mol-ecule B]. In mol-ecule B, two methyl-ene C atoms of the cyclo-hexene ring are disordered over two sites with occupancies of 0.58 (1) and 0.42 (1). The cyclo-hexene rings in both mol-ecules adopt half-chair conformations. The dihedral angle between the thio-phene ring and the carbazole ring system is 8.07 (9)° in mol-ecule A [3.10 (9)° in mol-ecule B]. In the crystal structure, the independent mol-ecules are linked into dimers by inter-molecular C-H⋯N hydrogen bonds. In addition, C-H⋯π inter-actions are observed.