Crystal structure and variable-temperature hydrogen-1 nuclear magnetic resonance spectrum of (dimethylnitratosilyl)[methyldiphenylsilyl]bis(trimethylsilyl)methane, C(SiMe3)2(SiMePh2)(SiMe2 ONO2)

Abstract

The crystal structure of the title compound has been determined. The silicon-bonded oxygen atom of the nitrate group is adjacent to the silicon atom of the SiMePh₂ group, but this does not seem to be the result of significant interaction between these atoms. The structure has no symmetry, so that the nine methyl groups are all non-equivalent, as are the two phenyl groups. In keeping with this, the ¹H n.m.r. resonances from the SiMe₃ and SiMe₂ protons, which show two singlets at room temperature appear as eight singlets at –90 °C (with no change in the signal from the SiMePh₂ group), and at the same time the two multiplets from the phenyl protons are replaced by two pairs of similar multiplets.