DEPT polarization transfer in ~(29)Si-NMR investigations of organically modified alkoxysilanes

摘要

The DEPT heteronuclear polarization transfer pulse sequence was used to unambiguously assign the high-resolution ~(29)Si-NMR (nuclear magnetic resonance) for the hydrolyzed monomer species in trimethylmethoxysilane, dimethyldimethoxysilane and methyltrimethoxysilane. The response of the DEPT sequence as a function of the interpulse delay time tau and the variable pulse angle 6 were analyzed for spin systems with multiple heteronuclear J-couplings. These results allow the DEPT sequence to be optimizedfor sensitivity enhancement in addition to providing an editing method for ~(29)Si-NMR of organically modified alkoxysilanes.