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Interaction of Phenamiphos with Montmorillonite

Published online by Cambridge University Press:  02 April 2024

J. Maza Rodríguez ,
A. Jiménez López  and
Sebastián Bruque
J. Maza Rodríguez
Affiliation:
Departamento de Química Inorgánica, Universidad de Malaga, Apartado 59, 29071 Málaga, Spain
A. Jiménez López
Affiliation:
Departamento de Química Inorgánica, Universidad de Malaga, Apartado 59, 29071 Málaga, Spain
Sebastián Bruque
Affiliation:
Departamento de Química Inorgánica, Universidad de Malaga, Apartado 59, 29071 Málaga, Spain
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Abstract

Phenamiphos interacted with homoionic montmorillonites of Ca2+, Mn2+, Co2+, and Ni2+ to form interlayer complexes having basal spacings of about 16.5 Å. In the infrared spectra, the ν-PO bands were displaced towards lower frequencies suggesting that this group interacted with the exchange cations. Moreover, a small shoulder at 1600 cm−1 indicated the partial protonation of the phenamiphos. After heating the complexes to 110°, 160°, and 200°C, however, the bands corresponding to δ-NH2+ and ν-NH intensified because of increased protonation, whereas the ν-PO bands had the same intensity as in pure phenamiphos. The fundamental implication of these observations is that phenamiphos interacts with exchange cations through molecules of coordinated water, possibly by means of the P=O group.

Keywords

Infrared spectroscopyMontmorilloniteOrganophosphorus compoundPesticidePhenamiphosProtonation
Type
Research Article
Information
Clays and Clay Minerals , Volume 36 , Issue 3 , June 1988 , pp. 284 - 288
Copyright
Copyright © 1988, The Clay Minerals Society

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