Crystal Structure of Dodecaphenylcyclohexa-germane · 5Benzene

M. Goto, S. Tokura, and K. Mochida
[Nihon Kagaku Zasshi, pp.200-207, 1994]

A new modification of the title compound was obtained by the recrystallization from benzene solution. The crystal structure has been determined by X-Ray diffraction: Crystal data; Ge₆(C₆H₅)₁₂·5(C₆H₆), P1, a=15.438(3)Å Mw=1751.39, b=16.636(3)Å, c=19.111(2)Å, a=74.90(1)°, b=70.29(2)°, gamma=71.37(1)°, Z=2, R=0.054, R_w=0.046 for 9592 observed (|Fo|geq 3sigma(|Fo|)) reflections.
There are two Ge₆Ph₁₂ molecules, both having a center of symmetry. The cyclohexagermane rings adopt chair conformations. As for the molecular packing, the dihedral angle between the 6-membered Ge ring and that of the nearest neighbor is 58°. The packing is different from that of Ge₆Ph₁₂ · 7benzene and the Ge₆Ph₁₂ · 2toluene.