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Distinction of tetrahedrally and octahedrally coordinated Al in phyllosilicates by NMR spectroscopy

Published online by Cambridge University Press:  09 July 2018

J. Sanz  and
J. M. Serratosa
J. Sanz
Affiliation:
Instituto de Fisico-Química Mineral, Consejo Superior de Investigaciones Científicas, Serrano 115 dpdo, Madrid-6, Spain
J. M. Serratosa
Affiliation:
Instituto de Fisico-Química Mineral, Consejo Superior de Investigaciones Científicas, Serrano 115 dpdo, Madrid-6, Spain
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Extract

In recent years, the availability of high-field superconducting magnets complemented with mechanical spinning of the samples (magic-angle spinning technique) has resulted in a considerable improvement in resolution of NMR spectra and has widened the use of this technique in the structural analysis of solid samples. In particular, NMR spectroscopy can distinguish the different chemical environments of tetrahedrally coordinated silicon and also determine short-range order in the distribution of Si and Al in micas (Sanz et al., 1983) and zeolites (Fyfe et al., 1983; Klinowski et al., 1982).

For aluminium (I = 5/2), the existence of strong quadrupolar interactions means that, in general, only the m½↔m−½ transition is observed. However, the signal is broadened by second-order quadrupolar effects, dipolar interactions and chemical shift anisotropies.

Type
Notes
Information
Clay Minerals , Volume 19 , Issue 1 , February 1984 , pp. 113 - 115
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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References

Fyfe, C.A., Thomas, J.M., Klinowski, J. & Gobbi, G.C. (1983) Magic-angle-spinning NMR (MAS-NMR) spectroscopy and the structure of zeolites. Angew. Chem. Int. Ed. Engl. 22, 259–336.Google Scholar
Klinowski, J., Ramdas, S. & Thomas, J.M. (1982) A re-examination of Si, Al ordering in zeolites NaX and NaY. J. Chem. Soc. Faraday Trans. II 78, 1025–1050.Google Scholar
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Sanz, J., Förster, H.G. & Serratosa, J.M. (1983) Si, Al local ordering in micas by MAS-NMR spectroscopy. Nature (in press).Google Scholar