Silicon-29 shielding tensors in some solid organosilicon compounds, studied by slow magic-angle spinning nuclear magnetic resonance

Abstract

Magic-angle spinning at slow rates (< 500 Hz) has been used to produce spinning sideband manifolds for the ²⁹Si spectra of six solid methyl, phenyl and benzyl silicon compounds (two disilanes, a disiloxane, a cyclotetrasilane and two triarylmonosilanes) under high-resolution conditions. Analysis of the spinning sidebands has given data for the shielding tensor components of the silicon nuclei. These results are discussed in terms of chemical structure and crystallographic data. The shielding anisotropy values obtained range from 11 to 45 ppm in magnitude.