Trifluoroiodosilane and difluorodi-iodosilane: their properties and use in preparing fluorosilicon derivatives with Si–N, Si–O, and Si–S bonds

Abstract

Fluoroiodosilanes SiF_4–xI_x(x= 1 or 2) have been prepared by cleavage of the corresponding dimethylaminofluoro-silanes with HI; their physical properties are reported. They react respectively with HgO to give (SiF₃)₂O and oligomeric fluorosiloxanes, and with water to give (SiF₃)₂O (initially) and fluorosiloxane polymers. The nature of volatile oligomers formed in these and other reactions is discussed. Trifluorosilyl pseudohalides SiF₃CN and SiF₃NCS are prepared from SiF₃I and corresponding Hg^II or Ag^I compounds. With HgS, SiF₃I, and SiF₂I₂ form silathianes, believed to be (SiF₃)₂S and (SiF₂S)₂. Trifluoroiodosilane reacts with NMe₃ to give a 1 :2 adduct, probably (SiF₃,2NMe₃)⁺I^–, with NHMe₂ to give SiF₃NMe₂, and with ammonia to give polymeric fluorosilazanes.