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Etude des interactions entre montmorillonites et agents organiques complexants

Published online by Cambridge University Press:  09 July 2018

J. Guignard
Affiliation:
Laboratoire de Chimie des Solides (ER 133 CNRS), Université P. et M. Curie, 4 Place Jussieu, 75230 Paris Cédex 05
H. Pezerat
Affiliation:
Laboratoire de Chimie des Solides (ER 133 CNRS), Université P. et M. Curie, 4 Place Jussieu, 75230 Paris Cédex 05

Résumé

On a étudié les interactions de différents ligands (cryptands et composés couronne) qui ont la propriété de complexer un grand nombre de cations en solution, avec des montmorillonites saturées par différents cations (Li+, Na+, K+, Ca2+, Cu2+).

Les résultats obtenus montrent qu'il y a bien ‘encagement’ des cations interfoliaires de la montmorillonite dans ces complexants. Ces cations complexés peuvent d'ailleurs s'échanger ultérieurement contre des cations simples.

Suivant la nature du cation complexé on obtient un gonflement à 14·5–15 Å ou à 16–17 Å. Ces ouvertures sont discutées en relation avec les encombrements des cations complexés.

Abstract

Abstract

Interactions between ligands (crown ethers and cryptants) capable of complexing large amounts of cations and montmorillonites saturated with Li+, Na+, K+, Ca2+ and Cu2+ have been studied. The results indicate that the interlayer cations of the montmorillonite are trapped within the ligands. These complexed cations can, however, be exchanged subsequently by cations in solution. According to the nature of the complexed cation a swelling of 14·5–15·0 Å or 16–17 Å is observed and these values are discussed in relation to the steric size of the complexed cations.

Kurzreferat

Kurzreferat

Es wurden die Wechselwirkungen zwischen den verschiedenen Liganden (Cryptanden und Kronenverbindungen), die die Eigenschaft haben, daß sie mit einer großen Anzahl von Kationen in Lösung Komplexe bilden, und mit verschiedenen Kationen (Li+, Na+, K+, Ca2+, Cu2+) gesättigten Montmorilloniten erforscht.

Die erzielten Ergebnisse erweisen, daß in der Tat ‘Einschließung’ von Zwischenschicht-Kationen des Montmorillonits in diesen Komplexbildnern stattfindet. Diese komplexgebundenen Kationen können übrigens schließlich durch einfache Kationen ersetzt werden.

Infolge der Beschaffenheit des Komplexkations findet bei 14·5–15 Å oder 16–17 Å eine Expansion statt. Diese Öffnungen werden in Verbindung mit der räumlichen Dichte der Komplexkationen besprochen.

Resumen

Resumen

Se han estudiado las interacciones de distintos ligandos (criptogénicos y compuestos corona) que tienen la propiedad de formar complejos de gran número de cationes en solución con montmorillonitas saturadas por distintos cationes (Li+, Na+, K+, Ca2+, Cu2+).

Los resultados obtenidos muestran que hay buen ‘encaje’ de los cationes interfoliares de la montmorillonita en estos complexantes.Estos cationes complejos pueden intercambiarse luego por cationes simples.

Según la naturaleza del catión complejo se obtiene un henchimiento a 14·5–15 Å o a 16–17 Å. Se discuten estas proposiciones en relación con las congestiones de cationes complejos.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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References

Lehn, J.M. (1974) Structure and bonding 16, Springer-Verlag, HeiDelberg.Google Scholar
Pedersen, C J. (1967a) J. Am. Chem. Soc. 89, 2495.CrossRefGoogle Scholar
Pedersen, C.J. (1967b) J. Am. Chem. Soc. 89, 7017.CrossRefGoogle Scholar
Bright, D & Truter, M.R. (1970) Natur. 225, 176.CrossRefGoogle Scholar
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