Newly applied two-dimensional solid-state NMR correlation techniques for the characterization of organically modified silicates

This paper highlights the use of two-dimensional (2D) solid-state NMR corre lation techniques to probe the chemical homogeneity of organically modified silicate networks. Specifically, Si-29{H-1} heteronuclear correlation (HET COR) NMR experiments have revealed the spatial proximity of the two types o f Si units present in a gel obtained from co-hydrolysis of methyldiethoxysi lane and triethoxysilane. Similar information has also been obtained by usi ng 2D H-1 homonuclear correlation NMR spectroscopy. Such experiments were o nly possible by combining the use of high magnetic field (14.10 T) with fas t MAS spinning rate (30 kHz).