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Cation exchange in synthetic manganates: II. The structure of an alkylammonium-saturated phyllomanganate

Published online by Cambridge University Press:  09 July 2018

E. Paterson ,
D.R. Clark ,
D. Russell  and
R. Swaffield
E. Paterson
Affiliation:
Department of Mineral Soils, Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, Scotland
D.R. Clark
Affiliation:
Department of Mineral Soils, Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, Scotland
D. Russell
Affiliation:
Department of Mineral Soils, Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, Scotland
R. Swaffield
Affiliation:
Department of Mineral Soils, Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, Scotland
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Abstract

A synthetic phyllomanganate saturated with a series of primary alkylammonium cations has been examined using XRD, chemical analysis and X-ray photoelectron spectroscopy. A linear relationship exists between the basal spacing of the saturated alkylammonium-manganate and the hydrocarbon chain length in the interlayer, and from the gradient it is concluded that the alkyl chains are perpendicular to the manganate sheet. This orientation is a function of both the charge density and the presence of a layer of water molecules immediately adjacent to the manganate basal surfaces. Evacuation results in the loss of this interlayer water and the structure of the organo-manganate is considerably disrupted. The extent to which the interlayer arrangement can be reinstated by rehydration is dependent on the chain length of the saturating organo-cation. For cations of chain length > C6 the C contents suggest that cation in excess of the exchange capacity is present in the interlayer, but the absence of any compensating anion and the release of amine on evacuation suggests that the excess C arises from the presence of free amine.

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 5 , December 1986 , pp. 957 - 964
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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