✍ Scribed by Dr. Bernhard Kräutler; René Stepánek
No coin nor oath required. For personal study only.
chain end groups (Q'), middle groups in chains (Q2), chain branching sites (Q'), and fully crosslinked framework sites (Q"). Within each structural category the ' ' Si chemical shift is correlated with the Si-0-Si bond angles and the interatomic distances. We conclude that, in agreement with the established structure, the sharp resonance at 6= -92 is attributable to Q' groupings (chain branching sites), and the chemical shift corresponds to an Si-0-Si angle of ca. 135". The single sharp resonance at 6 = -61 (x) is due to Qo (monosilicate) present as binder in the Z r 0 2 magic-angle spinner.
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