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Influence of Hydrazine on the Vibrational Modes of Kaolinite

Published online by Cambridge University Press:  02 April 2024

C. T. Johnston  and
D. A. Stone
C. T. Johnston
Affiliation:
Department of Soil Science, University of Florida, Gainesville, Florida 32611
D. A. Stone
Affiliation:
HQ AFESC/RDVS, Tyndall AFB, Florida 32403
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Abstract

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Raman and Fourier-transform-infrared (FTIR) spectroscopic methods and X-ray powder diffraction (XRD) techniques have been used to study the influence of hydrazine on the vibrational modes of kaolinite. Strong vibrational perturbations of the OH-stretching and -deformation bands were observed in the Raman and FTIR spectra on intercalation. The intensities of the Raman- and IR-active OH-stretching bands decreased significantly upon intercalation; the intensities of the Raman bands were reduced to a greater extent than the IR bands. The deformation bands were also strongly perturbed by the presence of hydrazine in the interlamellar region. Upon evacuation of the intercalate, two new bands at 3628 and 912 cm−1 were noted, indicating the presence of a different structural conformation of the complex under vacuum. Similar results were obtained using XRD, on evacuation of the kaolinite-hy-drazine (KH) complex the d(001) value decreased from 10.4 to 9.6 Å. Partial collapse of the intercalate from 10.4 to 9.6 Å was probably due to keying of the -NH2 moiety of hydrazine into the siloxane ditrigonal cavity, as indicated by a blue-shift of the inner-OH band from 3620 to 3628 cm-1. Structural OH vibrational modes may therefore be useful probes of amine interactions with clay mineral surfaces.

Keywords

Fourier-transform infrared spectroscopyHydrazineKaoliniteOH-vibration modesRaman spectroscopyX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 2 , April 1990 , pp. 121 - 128
Copyright
Copyright © 1990, The Clay Minerals Society

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