Crystal structure of 7,15-bis-(4-tert-butyl-phen-yl)-1,9-di-methyl-hepta-zethrene.

The title compound, C50H44, 1, was synthesized as a derivative of hepta-zethrene bearing two methyl and two tert-butyl-phenyl substituents, respectively, at the 1,9- and 7,15-positions. The asymmetric unit consists of one half of the mol-ecule, which lies about an inversion centre. Albeit remotely located, the substituents contort the hepta-zethrene plane. The tert-butyl-phenyl substituents stand approximately perpendicular to the core plane, with a dihedral angle of 79.09 (5)° between the phenalene ring system and the substituted benzene ring, and prevent direct inter-molecular contacts of the hepta-zethrene cores.