Synthesis and Structure of Tris(trialkylstannyl)‐ and Tris(dialkylhalostannyl)amines; Stabilization of the Sn
<sub>3</sub>
N Skeleton by Intramolecular Sn–X–Sn Bridges
interactions between the lone electron pair at the N atom and empty orbitals at the Sn atoms can be excluded. Therefore, the tristan-nylamines discussed here have a trigonal planar nitrogen center with its lone electron pair in a p-type orbital. Further characteristic features of the molecular structures of typ 3 compounds are the intramolecularSn–X–Snbridges (X = Cl, Br, I) found in the solid state as
三(triorganylstannyl)胺(R 2 R'Sn)3 N(1,2)被取代基R = R '= Me中,卜或R =我和R'=我PR,吨卜通过复分解自R 2 - [R液态氨中的SnX和NaNH 2,或R 3 SnNMe 2与NH 3的氨基转移。三(diorga-nylhalostannyl)胺(R 2 XSN)3 N(3)由(ME的stannazane裂解合成3 Sn)的3 N(1与R)2 SNX 2。来自多核磁共振谱的信息确定了类型2和3的Sn 3 N骨架的平面性,以及耦合常数1 J(119 Sn 15 N)和2 J(119 Sn 117 Sn)与Sn之间的关系。如通过的X射线结构分析确定-N键长度1,图3b和3R。化合物3b显示具有平面Br 3 Sn 3的几乎不变形的D 3h对称性N骨架和SnN键长度为1.99Å,是迄今为止发现的最短的3a长度。根据MNDO的近似和从头算计算,可