Hexacoordinated group-14 elements with phosphorus donor ligands: Syntheses and structures of Me(2)E[C(PMe(2))(2)(SiMe(3))](2) (E=Si,Ge,Sn)

被引：15

作者：

Karsch, HH ^{[1
]}

Deubelly, B ^{[1
]}

Keller, U ^{[1
]}

Bienlein, F ^{[1
]}

Richter, R ^{[1
]}

Bissinger, P ^{[1
]}

Heckel, M ^{[1
]}

Muller, G ^{[1
]}

机构：

[1] UNIV KONSTANZ,FAK CHEM,D-78464 CONSTANCE,GERMANY

来源：

CHEMISCHE BERICHTE | 1996年 / 129卷 / 07期

关键词：

hexacoordination; silicon compounds; germanium compounds; tin compounds; phosphanylmethanide ligands;

D O I：

10.1002/cber.19961290705

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The dimethyl group-14 element dihalides Me(2)EX(2) (E = Si, Ge, Sn; X= Cl or Br) react with two equivalents of Li[C(P-Me(2))(2)(SiMe(3))] to give the cis-hexacoordinated complexes Me(2)E[C(PMe(2))(2)(SiMe(3))](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 P2(1)/c, 2c crystallizes in the space group C2/c with crystallographic C-2(2) molecular symmetry. In all cases the diphosphanylmethanide ligands bind in an unisobidentate fashion. For compound 2c, this still can be attributed to the trans influence of the methyl group, but in 2a and 2b clearly borderline cases between hexa- and tetracoordination are found. Compound 2b (E = Ge) is much more on the side of tetracoordination than 2a, thus underlining the importance of small polarity differences for the actual coordination number achieved in compounds with relatively unpolar bonds.

引用

页码：759 / 764

页数：6

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