Clays and Clay Minerals

, Volume 35, Issue 1, pp 53–59 | Cite as

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

  • Yuko Soma
  • Mitsuyuki Soma
  • Yukio Furukawa
  • Issei Harada


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.

Key Words

Adsorption Interlayer reaction Montmorillonite Polymerization Raman spectroscopy Thiophene 


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Copyright information

© The Clay Minerals Society 1987

Authors and Affiliations

  • Yuko Soma
    • 1
  • Mitsuyuki Soma
    • 1
  • Yukio Furukawa
    • 2
  • Issei Harada
    • 2
  1. 1.National Institute for Environmental StudiesYatabe, Tsukuba, IbarakiJapan
  2. 2.Pharmaceutical InstituteTohoku UniversityAobayama, SendaiJapan

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