The Infrared Spectra of Several N-Containing Compounds Absorbed on Montmorillonites
Earlier investigations have shown that infrared spectroscopy provides an ideal non-destructive tool for investigation of adsorbed species present when simple compounds are adsorbed on ceramic materials1. In this study, we have looked at the infrared absorption spectra of several more complex compounds that can be adsorbed on montmorillonites. These compounds relate to biologically important materials that can be prepared on ceramic surfaces or in their interlamellar spaces. We will first discuss the spectra observed for adsorbed ammonia and gradually proceed to a discussion of the spectra observed for an adsorbed dipeptide, glycylglycine. The latter compound is the simplest compound which possesses a peptide linkage similar to proteins. The types of complexes formed on the clays depend strongly upon such factors as the time of exposure of the clay to the compound, the nature of the heat treatment of the clay complex and pH at which the clay complex was prepared. Analyses of the infrared spectra in this study distinctly indicate the exact nature of the types of complexes present in the montmorillonites.
KeywordsInfrared Spectrum Interlamellar Space Peptide Linkage Clay Complex Holder Unit
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