Hexacoordinated Group‐14 Elements with Phosphorus Donor Ligands: Syntheses and Structures of Me
<sub>2</sub>
E[C(PMe
<sub>2</sub>
)
<sub>2</sub>
(SiMe
<sub>3</sub>
)]
<sub>2</sub>
(E = Si, Ge, Sn)
作者:Hans H. Karsch、Brigitte Deubelly、Ursula Keller、Fritz Bienlein、Roland Richter、Peter Bissinger、Maximilian Heckel、Gerhard Müller
DOI:10.1002/cber.19961290705
日期:1996.7
Me2EX2 (E = Si, Ge, Sn; X = Cl or Br) react with two equivalents of Li[C(P-Me2)2(SiMe3)] to give the cis-hexacoordinated complexes Me2E[C(PMe2)2 (SiMe3)]2 (E = Si: 2a, E = Ge: 2b, E = Sn: 2c), which were characterized spectroscopically and by means of X-ray structure determinations. Whereas 2a and 2b are isotypic and crystallize in the space group P21/c, 2c crystallizes in the space group C2/c with
二甲基14元素二卤化物Me 2 EX 2(E = Si,Ge,Sn; X = Cl或Br)与两当量的Li [C(P-Me 2)2(SiMe 3)]反应生成顺式-六配位配合物Me 2 E [C(PMe 2)2(SiMe 3)] 2(E = Si:2a,E = Ge:2b,E = Sn:2c),已通过光谱法和X射线表征结构确定。而2a和2b是同型的并且在空间群P 2中结晶1 / c,2c在空间群C 2 / c中结晶,具有晶体学C 2(2)分子对称性。在所有情况下,二膦基甲烷化物配体均以不对称的方式结合。对于化合物2c,这仍然可以归因于甲基的反式影响,但是在2a和2b中,明显发现了六配位和四配位之间的临界情况。化合物2b(E = Ge)在四配位方面比2a多得多,因此强调了小的极性差异对于具有相对非极性键的化合物实现的实际配位数的重要性。