Montserrat Colilla, M. Darder, P. Aranda
Jan 19, 2005
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Journal
Chemistry of Materials
Abstract
The objective of this work is the study of the intercalation of 2- and 4- mercapto-substituted pyridines (2Mpy and 4Mpy, respectively) in Na+−montmorillonite, providing intercalation compounds with interesting functional properties derived from the presence of the mercapto group. CHN chemical analysis, X-ray diffraction, Fourier transform infrared spectroscopy, and 13C NMR spectroscopy have been employed for the characterization of the intercalation compounds. The molecular arrangement of such species in the interlayer space depends on the intercalation medium (neutral or acidic) and on the position of the mercapto group in the starting mercaptopyridine. In methanol medium, only 4Mpy can be intercalated, the pyridine ring interacting with the interlayer cations through water bridges. 2Mpy and 4Mpy can be intercalated by cation exchange from the corresponding protonated (pyridinium) derivatives, formed by addition of 1 M HCl to the intercalation medium. Tautomeric equilibrium between thiol and thione speci...