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The application of electron spin resonance spectroscopy to studies of clay minerals: II. Interlamellar complexes—structure, dynamics and reactions

Published online by Cambridge University Press:  09 July 2018

Peter L. Hall
Peter L. Hall*
Affiliation:
Department of Chemistry, University of Birmingham, P.O. Box 363, Birmingham BI5 2TT, England
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Abstract

A review is given of the application of ESR spectroscopy to the study of hydrated transition metal ions and nitroxide spin probes in the interlamellar region of smectites and vermiculites. These investigations have not only provided information regarding the structure and mobility of the intracrystalline water-cation layers but have also demonstrated the reactivity and catalytic properties of certain transition metal exchange forms of smectites. Several novel coordination complexes and redox reactions between the exchange ions and a variety of simple organic molecules have been characterized.

Résumé

Résumé

On passe en revue l'application de la spectroscopie RPE à l'étude des ions de métaux de transition hydratés et des sondes paramagnétiques oxynitrées, situés dans l'espace interlamellaire des smectites et des vermiculites. Ces recherches apportent non seulement des informations concernant la structure et la mobilité des couches eau-cations intracristallines, mais également sur la réactivité et les propriétés catalytiques de certaines formes de smectites échangées par des métaux de transition. On a pu caractériser plusieurs complexes nouveaux de coordination ainsi que des réactions redox entre les ions échangeables et des molécules organiques variés.

Kurzreferat

Kurzreferat

Es wurde ein Überblick gegeben über die Anwendung der ESR-Spektroskopie zur Untersuchung von Übergangsmetall-Ionen und Nitroxydspin-Proben im interlamellaren Bereich von Smektiten und Vermiculiten. Diese Untersuchungen brachten nicht nur Kenntnisse bezüglich der Struktur und Mobilität der interkristallinen Wasserkationen-Schichten, sondern haben auch die Reaktivität und katalytischen Eigenschaften bestimmter Austauschformen der Übergangsmetalle von Smektiten gezeigt. Mehrere ungewöhnliche Koordinationskomplexe und Redox-Reaktionen zwischen Austauschionen und einer Vielzahl einfacher organischer Moleküle konnten charakterisiert werden.

Resumen

Resumen

Se facilita una reseña de la aplicación de la espectroscopia de resonancia del espín de los electrones al estudio de los iones de metales de transición hidratados y a las sondas del espín de los nitróxidos en la región interlamelar de esmectitas y vermiculitas. Estas investigaciones no sólo han proporcionado información sobre la estructura y la movilidad de las capas intracristalinas de cationes del agua, sino que han demostrado además la reactividad y las propiedades catalíticas de ciertas formas de intercambio de metales de transición de las esmectitas. Se han caracterizado varios complejos de coordinación y reacciones de reducción-oxidación entre los iones de intercambio y una variedad de moléculas orgánicas sencillas.

Type
Research Article
Information
Clay Minerals , Volume 15 , Issue 4 , December 1980 , pp. 337 - 349
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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