²⁹ Si and ²⁷ Al nuclear magnetic resonance spectroscopy of 2:1 clay minerals

James Cook Univ. North Queensl., Dep. Geol., Townsville, Australia

NMR spectroscopy with magic-angle spinning was used to study two smectites, two illites and a vermiculite. ²⁷ Al NMR was able to directly observe the coordination of aluminum. ²⁹ Si NMR was sensitive to both the chemical nature of the interlayer species and the presence of aluminium in the tetrahedral sheet. Well-resolved resonances in the vermiculite at delta = -84.6, -88.7 and -92.9 (ppm relative to TMS) were assigned to Q ³ (2Al), Q ³ (lAl) and Q ³ (0Al) respectively. The smectites exhibited single resonances centred at delta = -93 (Q ³ (0Al)). The illites displayed broad resonances between delta = -80 and -105. The ²⁹ Si spectrum of a smectite complexed with alkylammonium cations showed a shielding of up to 1 ppm relative to the untreated sample.

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