Adducts formed between some halogenosilanes and the organic bases pyridine, trimethylamine, and tetramethylethylenediamine. Part I. Stoichiometry

Abstract

Pyridine causes SiH₃F, SiH₃Cl, SiH₂F₂, and some silyl pseudohalides to decompose. With each of the other halides of formula SiH_4–nX_n it forms a single adduct, of 1 : 2 (halide : base) composition in most cases, though SiH₂Br₂, SiH₂I₂, SiHBr₃, and SiHI₃, like SiI₄, give 1 : 4 adducts. Trimethylamine forms two adducts with most halogenosilanes, one of which is always of 1 : 1 composition, while tetramethylethylenediamine forms 1 : 1 adducts with the fluorosilanes, the chlorosilanes, and bromosilane. Methylation at silicon reduces the acceptor properties of the silicon atom.