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Influence of charge location on ²⁹Si NMR chemical shift of 2:1 phyllosilicates

¹ Instituto de Ciencia de Materiales, CSIC, Cantoblanco, 28049 Madrid, Spain
² ISTO, UMR 6113, CNRS-Université d’Orléans, 1A rue de la Férollerie, 45071 Orléans Cedex 2, France

Correspondence: ^* E-mail: jsanz{at}icmm.csic.es

A series of synthetic sodium-rich saponites and trioctahedral Na, K, and Ba mica solid solutions have been investigated by ²⁹Si MAS-NMR spectroscopy. The salient result is the major effect of the interlayer charge on ²⁹Si chemical shift variations detected in NMR components ascribed to tetrahedral Si₃, Si₂Al, SiAl₂, and Al₃ environments. In this analysis, the effect of the octahedral charge is considerably lower. The contribution of the interlayer charge is much more important than the previously reported contribution of the ditrigonal distortion of tetrahedral layers, generated by the misfit between tetrahedral and octahedral layers. This observation rests on the peculiar disposition of tetrahedra in phyllosilicates, with three out of four oxygen atoms exposed to the interlamellar space. A similar effect could be operative in other silicates, like zeolites, in which most of tetrahedra interact with charge compensating cations.

Key Words: Phyllosilicates • crystal structure • order-disorder • chemical shift • ²⁹Si NMR spectroscopy

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