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S. Hayashi, E. Akiba, R. Miyawaki, and S. Tomura
[Clays and Clay Minerals, Vol.42, No.5, pp.561-566, 1994]
2H NMR spectra of synthetic deuterated kaolinite have been collected in the temperature range from 150K to 350K, as shown in Fig.1. Hydroxyl groups show a Pake doublet pattern with an asymmetry factor of 0. They are almost fixed spatially, and undergo a wobbling motion with increasing temperature. The quadrupole coupling constant is 273±3 kHz at 150K, which indicates that interlayer hydrogen bonding is relatively weak.
