Electrochemical polymerization and depolymerization of 2,5-dimercapto-1,3,4-thiadiazole. QCM and spectroscopic analysis

Tetsu Tatsuma, Yasuyuki Yokoyama, Daniel Buttry, Noboru Oyama

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Electrochemical oxidation of a dimercaptan, 2,5-dimercapto-1,3,4-thiadiazole (DMcT), to a polydisulfide (DMcT polymer) and electrochemical reduction of the polydisulfide at a carbon electrode and an indium - tin oxide electrode have been studied in 0.1 M LiClO4 - acetonitrile by means of an in situ electrochemical quartz crystal microbalance and in situ spectroelectrochemistry, respectively. It is observed that the polymerization potential is more positive than the dimerization potential. Both the potentials at which DMcT dimer and DMcT polymer are formed are made more negative by the presence of a base. The potential at which the DMcT polymer is reductively depolymerized is also shifted in the negative direction in the presence of a base. The experiments also show that the DMcT polymer reacts with DMcT monomer under open-circuit conditions. This results in dissolution of the polymer in the presence of the monomer. The results also suggest that the product of the redox reaction is the DMcT dimer. Base is shown to hinder this reaction.

Original languageEnglish (US)
Pages (from-to)7556-7562
Number of pages7
JournalJournal of Physical Chemistry B
Volume101
Issue number38
StatePublished - Sep 18 1997
Externally publishedYes

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depolymerization
Depolymerization
Spectroscopic analysis
Electropolymerization
spectroscopic analysis
polymerization
Polymers
polymers
Dimers
monomers
Monomers
dimers
Spectroelectrochemistry
Electrodes
electrodes
Dimerization
electrochemical oxidation
Electrochemical oxidation
Redox reactions
Quartz crystal microbalances

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Engineering(all)

Cite this

Electrochemical polymerization and depolymerization of 2,5-dimercapto-1,3,4-thiadiazole. QCM and spectroscopic analysis. / Tatsuma, Tetsu; Yokoyama, Yasuyuki; Buttry, Daniel; Oyama, Noboru.

In: Journal of Physical Chemistry B, Vol. 101, No. 38, 18.09.1997, p. 7556-7562.

Research output: Contribution to journalArticle

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