SCHEDULED MAINTENANCE
Solid state 27Al n.m.r. spectroscopy of various aluminosilicates (zeolites, clays, amorphous SiO2–Al2O3) shows that upon thermal or hydrothermal treatment a line appears at ∼30 p.p.m.; the position of this line suggests that penta-co-ordinated Al is present in all these aluminosilicates.
J. Gilson, G. C. Edwards, A. W. Peters, K. Rajagopalan, R. F. Wormsbecher, T. G. Roberie and M. P. Shatlock, J. Chem. Soc., Chem. Commun., 1987, 91 DOI: 10.1039/C39870000091
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