Abstract:
All investigated crystals of the title penta-cene derivative, C76H110Si6, obtained from benzene solution and examined at 120 K, were identified as non-merohedral twins. The crystal examined in this study had an approximate 2:1 domain ratio. The mol-ecules have crystallographic inversion symmetry and approximate C 2h symmetry, with a planar conjugated central core, including the peripheral C C triple bonds. The mol-ecules pack in layers perpendicular to the a axis, with a dihedral angle between individual mol-ecules in adjacent layers of 5.25 (2)°; π-π stacking is prevented by the bulky substituents. One methyl group is disordered over two positions with occupancies of 0.6 and 0.4. © International Union of Crystallography 2007.