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Reactions of smectites with binuclear oxobridged iron complexes of N-alkyl-N,N-bis (2-pyridylmethyl)amines

Published online by Cambridge University Press:  09 July 2018

S. Dick  and
A. Weiss
S. Dick
Affiliation:
Institut für Anorganisehe Chemie der Universität Münehen, Meiserstraβe 1, D-80333 Münehen, Germany
A. Weiss
Affiliation:
Institut für Anorganisehe Chemie der Universität Münehen, Meiserstraβe 1, D-80333 Münehen, Germany
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Abstract

Cationic binuclear oxo- and carboxylate bridged Fe(III) complexes of N-alkyl-N,Nbis(2-pyridylmethyl)amines are introduced into the interlayer region of smectites by cation exchange reactions. The reaction can be divided into three steps. After a predominant loading of external surfaces, cation exchange sites at internal surfaces react, accompanied by considerable stmctaral expansion. Both reaction stages belong to the steep section of the exchange isotherms. At a certain loading, which depends on the complex substituents and the layer charge of the smectite, the isotherms become flat. With bulky shaped complex cations and highly charged smectites, exchange is not quantitative; vermiculite-type minerals show a very small complex uptake. For this behaviour, both thermodynamic and kinetic reasons must be considered. From these results the number of cation exchange positions at external surfaces of smectite crystals may be estimated.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 1 , March 1998 , pp. 35 - 42
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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