Preparation and properties of some silyl- and germyl-halogenoacetylenes and of digermylacetylene

Abstract

The compounds H₃SiCCCl, D₃SiCCCl, H₃SiCCBr, H₃GeCCCl, H₃GeCCGeH₃, and H₃SiCCSiH₃ have been prepared by reaction of silyl or germyl halides with the lithium and sodium derivatives Li(CCCl), Li₂C₂, and Na(CCBr). They have been characterised by a variety of physical and spectroscopic techniques (i.r., Raman, u.v., and photoelectron spectroscopy). Normal-co-ordinate analysis-of the vibrational data shows that most vibrations of these molecules are isolated, but that the two low-frequency stretches and the two skeletal bends are strongly coupled.