Reaction of silicon difluoride with halogens: a reinvestigation

Abstract

Reactions of SiF₂ with halogens have been reinvestigated by both co-condensation and gas-phase methods. The co-condensation method yields a number of fluorohalogenosilanes including mono-, di-, and higher silane derivatives. These compounds contain SiF, SiF₂, and SiF₃ units. The reactivity towards SiF₂ decreases from chlorine through bromine to iodine. While chlorine and bromine give rise to a number of fluorohalogenosilanes, iodine yields only the monosilane derivatives. In contrast, the gas-phase reactions do not progress to any appreciable extent. The products have been characterized by mass spectrometry and ¹⁹F and ²⁹Si n.m.r. spectroscopy. Many have been identified for the first time.