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Crystal Structure of Kaolinite: Dimethylsulfoxide Intercalate

Published online by Cambridge University Press:  02 April 2024

J. G. Thompson  and
C. Cuff
J. G. Thompson*
Affiliation:
Geology Department, James Cook University of North Queensland, Townsville, Queensland 4811, Australia
C. Cuff
Affiliation:
Geology Department, James Cook University of North Queensland, Townsville, Queensland 4811, Australia
*
1Present address: Research School of Chemistry, Australian National University, GPO Box 4, Canberra ACT 2601, Australia.
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Abstract

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The crystal structure of the kaolinite: dimethylsulfoxide (DMSO) intercalate (P1, a = 5.187(2), b = 8.964(3), c = 11.838(4) Å, α = 91.53(1)°, β = 108.59(2), γ = 89.92(1)°) has been determined using spectroscopic and X-ray and neutron powder diffraction data. Both the X-ray and neutron powder diffraction patterns were refined. Solid-state 13C, 29Si, and 27Al nuclear magnetic resonance data and previously collected infrared spectroscopic data provided a useful starting model for structural refinement. Due to the extreme overlap of reflections of this low-symmetry unit cell, the Rietveld method proved inadequate, and quasi-single crystal methods were employed. Each DMSO molecule was found to be triply hydrogen bonded above the octahedral vacancy in the gibbsitic sheet of the kaolinite layer. One methyl group is keyed into the ditrigonal hole in the tetrahedral sheet with the other S-C bond parallel to the sheet. The DMSO molecules are accommodated by significant horizontal displacement of individual kaolinite layers to achieve almost perfect overlap of the octahedral vacancy by the adjacent ditrigonal hole.

Keywords

Crystal structureDimethylsulfoxideInfrared spectroscopyIntercalateKaoliniteNeutron powder diffractionNuclear magnetic resonanceX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 33 , Issue 6 , December 1985 , pp. 490 - 500
Copyright
Copyright © 1985, The Clay Minerals Society

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