Further Consideration of the 29Si Nuclear Magnetic Resonance Spectrum of Kaolinite

J. G. Thompson1 and P. F. Barron2
1 Research School of Chemistry, Australian National University, GPO Box 4, Canberra, ACT 2601, Australia
2 Brisbane NMR Centre, School of Science, Griffith University, Nathan, Queensland 4111, Australia

Abstract: The introduction of artificial ±b/3 stacking faults into well-crystallized kaolinite by intercalating and removing hydrazine had no observable effect on the solid-state 29Si nuclear magnetic resonance spectrum of kaolinite. Also, the introduction of such stacking faults did not alter the hydroxyl-stretching region of the infrared spectrum, implying no change in the hydrogen bonding between the displaced layers. Calculations of Si…H distances and Si-O…H angles from reported structures for kaolinite indicated that the resolution of the two Si chemical environments was due to differences in hydrogen-bonding at the surface of the silicate sheet.

Key Words: Hydrazine • Hydrogen bond • Kaolinite • Nuclear magnetic resonance • Stacking fault

Clays and Clay Minerals; February 1987 v. 35; no. 1; p. 38-42; DOI: 10.1346/CCMN.1987.0350105
© 1987, The Clay Minerals Society
Clay Minerals Society (www.clays.org)