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- ItemCrystal structure of 1,1,2,2-tetramethyl-1,2-bis(2,3,4,5-tetramethylcyclopenta-2,4-dien-1-yl)disilane(Chester : International Union of Crystallography, 2015) Godemann,Christian; Spannenberg, Anke; Beweries, TorstenThe molÂecular structure of the title compound, C22H38Si2, features a trans arrangement of the cycloÂpentaÂdienyl rings to avoid steric strain [C-Si-Si-C torsion angle = -179.0 (5)°]. The Si-Si bond length is 2.3444 (4) Ã…. The most notable interÂmolecular interÂactions in the molÂecular packing are C-H...[pi] contacts that lead to the formation of wave-like supraÂmolecular chains along the b axis.