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I.R. Spectroscopic Evidence for Interaction Between Hydronium ions and Lattice OH Groups in Montmorillonite

Published online by Cambridge University Press:  01 July 2024

J. D. Russell  and
A. R. Fraser
J. D. Russell
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
A. R. Fraser
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen, Scotland
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Abstract

At low levels of hydration, exchangeable D+ in montmorillonite interacts with lattice OH groups and quantitatively converts AlMgOH groups to AlMgOD. Hydroxyl groups coordinated to two Al ions undergo a slower exchange, the extent of which is restricted by octahedral Fe3+ ions. The OH stretching vibration of AlMgOH groups in montmorillonite is assigned an unusually high frequency (3687 cm−1) compared with that of the same group in phengites (3602 cm−1).

Résumé

Résumé

A tous les niveaux d’hydration, le D+ interchangeable dans la montmorillonite réagit sur les groupes OH croisés et, quantitativement, transforme les groupes AlMgOH en AlMgOD. Les groupes hydroxyles coordonnés aux deux ions Al subissent un échange plus lent, dont l’étendue est restreinte par les ions octahédraux de Fe3+. La vibration tendant à OH des groupes AlMgOH dans montmorillonite a une haute fréquence inhabituelle (3687 cm−1) par comparaison avec celle du même groupe dans les phengites (3602 cm−1 ).

Kurzreferat

Kurzreferat

Auf zwei Ebenen der Hydration reagiert austauschbares D+ in Montmorillonit mit Gitter-OH Gruppen und verwandelt quantitativ AlMgOH Gruppen in AlMgOD Gruppen. Hydroxylgruppen, die mit zwei Al Ionen koordiniert sind erfahren langsameren Austausch, wobei das Ausmass desselben durch oktaedrische Fe3+ Ionen begrenzt wird.

Der OH Dehnvibration von AlMgOH Gruppen in Montmorillonit wird eine Frequenz (3687 cm−1) zugeschrieben, die im Vergleich mit der derselben Gruppe in Phengiten (3602 cm−1) ungewöhnlich hoch ist.

Резюме

Резюме

При низких степенях гидратации обменный ион D+ в монтмориллоните взаимодействует с группами ОН, входящими в кристаллическую решетку, и количественно переводит группы А1МgОН в А1МgOD. Гидроксильные группы, координированные двумя ионами А1, подвергаются более медленному обмену, степень которого ограничена октаэдрическими ионами Fе3+.

Деформационные колебания ОН в группах АlМgОН в монтмориллоните имеют необычно высокую частоту (3687 см−1) по сравнению с частотой колебания этих групп в фенгитах (3602 см−1).

Type
Research Article
Information
Clays and Clay Minerals , Volume 19 , Issue 1 , March 1971 , pp. 55 - 59
Copyright
Copyright © 1971, The Clay Minerals Society

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