Proton, carbon, silicon and tin nmr studies on methyl-trichlorosilane and methyltrichlorostannane in isotropic and anisotropic phases

The natural-abundance 1H, 13C, 29Si, 117Sn and 119Sn NMR spectra of methyltrichlorosilane and methyltrichlorostannane in isotropic and anisotropic phases have been recorded and analyzed, and the geometries of these molecules deduced. The indirect contribution to the Si—H and Sn—H couplings is negligible, while the relative anisotropies of the indirect Si—C and Sn—C coupling constants are 68% and 190%, respectively. The degree of orientation in methyltrichlorosilane is observably larger than values measured previously.