Ionic Dissociation of SiCl4 : Formation of [SiL6 ]Cl4 with L=Dimethylphosphinic Acid

Abstract

Reactions of SiCl₄ with R₂ PO(OH) (R=Me, Cl) yield compounds with six-fold coordinated silicon atoms. Whereas R=Me afforded the hexacoordinated tetra-cationic silicon complex [Si(Me₂ PO(OH))₆ ]⁴⁺ with chloride counter-ions, R=Cl caused release of HCl with formation of a cyclic dimeric silicon complex [Si(Cl₂ PO(OH))(Cl₂ PO₂ )₃ (μ-Cl₂ PO₂ )]₂ with bridging bidentate dichlorophosphates.

Keywords: NMR spectroscopy; Si−Cl dissociation; X-ray diffraction; hypervalent compounds; structure elucidation.