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The Orientation and Interaction of Ethylenediamine Copper (II) with Montmorillonite

Published online by Cambridge University Press:  01 July 2024

John L. Burba III  and
James L. McAtee Jr.
John L. Burba III
Affiliation:
Chemistry Department, Baylor University, Waco, TX 76703, U.S.A.
James L. McAtee Jr.
Affiliation:
Chemistry Department, Baylor University, Waco, TX 76703, U.S.A.
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Abstract

The d(001) spacings for a series of montmorillonite samples containing increasing amounts of Cu(en)32+ were recorded after exposure to 50% humidity, 10% humidity, and air that had been saturated with ethylene glycol. It was found that Cu(en)32+ is too large to fit between the montmorillonite particles and that in those samples with large amounts of ethylenediamine Cu(II) added, the clay platelets are associated with stronger interactions than those with small amounts of Cu(II) complex added.

Infrared spectroscopy and electron spin resonance analysis indicate that the absorbed copper (II) complex is the square planar bis ethylenediamine Cu(II) and that the complex ion is oriented so that the dz2 orbital is perpendicular to the clay surface. The montmorillonite particles may act as ligands and coordinate with Cu(en)22+ ions.

Type
Research Article
Information
Clays and Clay Minerals , Volume 25 , Issue 2 , April 1977 , pp. 113 - 118
Copyright
Copyright © Clay Minerals Society 1977

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