Synthesis and structures of silicon-, germanium- and tin-containing tungsten imido alkyl complexes (ArN) 2W(CH 2EMe 3) 2 (E = Si, Ge, Sn)

Abstract

The novel silicon-, germanium- and tin-containing imido alkyl complexes of tungsten of the type (ArN) 2W(CH 2EMe 3) 2 ( Ar = 2 , 6 - Pr 2 i C 6 H 3 ; E = Si ( 1), Ge ( 2), Sn ( 3)) have been prepared by the reactions of (ArN) 2WCl 2(dme) (dme = 1,2-dimethoxyethane) with heteroelement-containing alkyllithium or Grignard reagents Me 3ECH 2Li (E = Si, Ge), Me 3ECH 2MgCl (E = Ge, Sn). The title compounds were isolated in high yields as crystalline solids and characterized by elemental analysis, IR, 1H, 13C, 29Si and 119Sn NMR spectroscopy and X-ray diffraction studies. The geometry of the W atoms in the compounds can be described as a distorted tetrahedron.