The cocrystal 10-(2-methyl-4-phenyl-1H-inden-6-yl)-10H-phenothia-zine-10-(2-methyl-7-phenyl-1H-inden-5-yl)-10H-phenothia-zine (0.54/0.46).

The title compound, 0.535C(28)H(21)NS.0.465C(28)H(21)NS, was synthesized by palladium-catalysed amination. The structure is composed of two isomeric mol-ecules, viz. 10-(2-methyl-4-phenyl-1H-inden-6-yl)-10H-phenothia-zine, and 10-(2-methyl-7-phenyl-1H-inden-5-yl)-10H-phenothia-zine, in the refined ratio 0.535 (12):0.465 (12). The isomers differ by the localization of the double bond in the cyclo-penta-diene ring. There are two sites in the structure that are occupied by the isomers. The respective isomers are occupationally disordered in each site, the refined proportions being 0.640 (6):0.360 (6) and 0.43 (1):0.57 (1). Moreover, each isomeric mol-ecule is chiral; due to the crystallographic centres of symmetry, the mol-ecules are also present in enanti-omeric pairs. The crystal structure is stabilized by weak π-π [C⋯C = 3.389 (2) Å] inter-actions.