Couzijn Erik P A, Lutz Martin, Spek Anthony L, Lammertsma Koop
Acta Crystallogr Sect E Struct Rep Online. 2009 Aug 19;65(Pt 9):o2182-3. doi: 10.1107/S1600536809031961.
The title compound, -Si(C(12)H(9))(2)OSi(CH(3))(2)O-, was obtained unintentionally as the product of an attempted crystallization of caesium bis-(biphenyl-2,2'-di-yl)fluoro-silicate from dimethyl-formamide. In the crystal, the mol-ecule is located on an inversion center and the siloxane ring adopts a twist-chair conformation with the two dimethyl-substituted Si atoms lying 0.7081 (5) Å out of the plane defined by the two bis-(biphenyl-2-yl)-substituted Si atoms and the four O atoms. In each Si(C(12)H(9))(2) unit, the orientation of one terminal phenyl ring relative to the phenyl-ene ring of the other biphenyl moiety suggests a parallel displaced π-π stacking inter-action [centroid distance = 4.2377 (11) Å and dihedral angle = 15.40 (9)°].
标题化合物[-Si(C₁₂H₉)₂OSi(CH₃)₂O-]₂是在尝试从二甲基甲酰胺中结晶铯双（联苯-2,2'-二基）氟硅酸盐时意外得到的产物。在晶体中，分子位于一个对称中心上，硅氧烷环采用扭船式构象，两个二甲基取代的硅原子偏离由两个双（联苯-2-基）取代的硅原子和四个氧原子所定义平面0.7081(5) Å。在每个Si(C₁₂H₉)₂单元中，一个末端苯环相对于另一个联苯部分的苯环的取向表明存在平行位移的π-π堆积相互作用[质心距离 = 4.2377(11) Å，二面角 = 15.40(9)°]。
