Table 3.
Chemical shifts and relative peak areas obtained by solid state 29Si and 31P Single Pulse MAS NMR spectroscopy. The peaks areas for the Qn units were calculated by Gaussian line-shape deconvolutions and their relative populations were expressed as percentages (%).
| 29Si | 31P | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sample | Q4 | Q3 | Q2 | Q0 | Q1 | |||||||||||
| CS ppm | Area (%) | fwhm ppm | CS ppm | Area (%) | fwhm ppm | CS ppm | Area (%) | fwhm ppm | <Qn>a | CS ppm | Area (%) | fwhm ppm | CS ppm | Area (%) | fwhm ppm | |
| BL-GE | -112 | 63.3 | 8.9 | -102 | 33.8 | 6.8 | -92 | 3.0 | 6.0 | 3.60 | 2.4 | 90 | 5.3 | 8.0 | 10.0 | 8.0 |
| 4ZN-GE | -111 | 67.4 | 10 | -102 | 28.7 | 5.0 | -92 | 3.8 | 8.3 | 3.63 | 2.6 | 95 | 5.7 | 8.2 | 5.0 | 7.3 |
| 5ZN-GE | -111 | 69.4 | 9.6 | -102 | 23.7 | 6.4 | -93 | 6.9 | 7.6 | 3.62 | 2.6 | 96 | 5.5 | 8.7 | 4.0 | 7.2 |
a
Network connectivity of MBGs as a function of chemical composition <Qn> = (4×%Q4)/100 + (3×%Q3)/100 + (2×%Q2)/100 + (%Q1)/100