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2,2,5,5-四甲基-1-氮-2,5-二硅环戊烷及双-(二乙氨基二甲基硅基)乙烷分别与乙二胺进行胺解反应均生成标题化合物,结构单晶经X射线分析确证。晶体属正交晶系,空间群为P_(cab)。晶胞参数a=11.043(3),b=12.811(2),c=16.090(4)A;V=2276A~3;Z=4;D_=1.01g·cm~(-3);μ=2.53cm~(-1)结构分析表明,分子具有对称中心,环系中的五个原子处于近乎同一平面内,氮原子系平面构型,因而使氮原子的未公用电子对所占p轨道与相连硅的3d轨道之间的作用更为有利;环中的Si-N-Si键角为114.5°,较相应开链类似物[(CH_3)_3Si]_2NH中的Si-N-Si键角(131.3°)显著为小,这可能就是乙二胺中氮上的四个氢在胺解条件下能同时被四个硅基取代的原因。
2,2,5,5-tetramethyl-1-azonia-2,5-disilacyclopentane and bis- (diethylaminosilyl) ethane were respectively amidolysed with ethylenediamine The title compound was generated and the single crystal was confirmed by X-ray analysis. Crystals belong to orthorhombic, space group P_ (cab). Cell parameters a = 11.043 (3), b = 12.811 (2), c = 16.090 (4) A; V = 2276A -3; Z = 4; D_ = 1.01 g · cm -3; The structure of cm ~ (-1) shows that the molecule has a symmetric center. The five atoms in the ring system are in nearly the same plane and the nitrogen atom is of planar configuration. Thus, the p-orbit occupied by the un-shared electron pair of the nitrogen atom is connected The Si-N-Si bond angle in the ring is 114.5 °, which is higher than the Si-N-Si bond angle in the corresponding open-chain analogue [(CH_3) _3Si] _2NH °) is significantly smaller, which may be the reason why four hydrogen atoms in ethylenediamine can be simultaneously substituted by four silicon groups under aminolysis conditions.