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Reactions of Thiophene and Methylthiophenes in the Interlayer of Transition-Metal Ion-Exchanged Montmorillonite Studied by Resonance Raman Spectroscopy

Published online by Cambridge University Press:  02 April 2024

Yuko Soma ,
Mitsuyuki Soma ,
Yukio Furukawa  and
Issei Harada
Yuko Soma
Affiliation:
National Institute for Environmental Studies, Yatabe, Tsukuba, Ibaraki 305, Japan
Mitsuyuki Soma
Affiliation:
National Institute for Environmental Studies, Yatabe, Tsukuba, Ibaraki 305, Japan
Yukio Furukawa
Affiliation:
Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980, Japan
Issei Harada
Affiliation:
Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980, Japan
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Abstract

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The adsorption and reaction of thiophene and methylthiophenes in the interlayer of Cu2+- and Fe3+-montmorillonites were investigated by resonance Raman spectroscopy. Thiophene and 3-methylthiophene polymerized to form cations of polythiophene and polymethylthiophene respectively, which were characterized by absorption bands in the near-infrared region. These polymer cations formed in the interlayer were reduced to their neutral polymers if the clay-polymer complexes were in contact with water, and the formation of their neutral polymers was clearly demonstrated by their resonance Raman spectra. 2,5-Dimethylthiophene in which polymerization was hindered by methyl substitution at the 2 and 5 positions, was oxidized to 2,5-dimethylthiophene cation in the interlayer.

Keywords

AdsorptionInterlayer reactionMontmorillonitePolymerizationRaman spectroscopyThiophene
Type
Research Article
Information
Clays and Clay Minerals , Volume 35 , Issue 1 , February 1987 , pp. 53 - 59
Copyright
Copyright © 1987, The Clay Minerals Society

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