| Abstract: | Contributions to the Chemistry of Silicon-Sulphur Compounds. XXIX. 29Si-N.M.R. Investigations Three series of silicon-sulphur compounds (RO)3SiSR′ (I), (i-PrO)4?nSi(SEt)n (II) and cyclic Si? S compounds (III) were prepared, some of them at the first time and their 29Si-N.M.R. spectra were measured. In the series of trialkoxysilylthio derivatives (I) were the steric and inductive effects of the RO and R'S groups evaluated. In the series II were the 29Si-N.M.R. chemical shifts related to the relative paramagnetic screening constants σ* and netto charge at the silicon atom q(Si) using the EN-quantum-chemical model discussed. In the series III were the shift contribution of the (SiS)2 and 1-sila-2,5-dithiacyclopentan rings determined. |
