Cyclic voltammetry study of asymmetrical trityl di- And trisulfides on coated and bare gold electrodes

Nathir A.F. Al-Rawashdeh, Imad A. Abu-Yousef, Sofian M. Kanan

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5 Citations (Scopus)


The electrochemical reduction processes of a new series of asymmetrical trityl di- (TrSSR) and trisulfides (TrSSSR) were studied using cyclic voltammetry on bare and coated gold electrodes. On a coated gold electrode surface, adsorption phenomena are absent; the electrochemical reduction process is irreversible and found to be diffusion controlled. In contrast, on a bare gold electrode surface, a self-assembled monolayer of TrSAuads and RSAuads for disulfides and TrSSAuads or RSSAu ads for trisulfides originates after S-S bond breakage observed by simply dipping the gold electrode in a solution of sulfides. This study shows that the electron-transfer mechanism of the studied compounds causes the cleavage of the S-S σ bond on the bare gold electrode and cleavage of the Tr-S σ bond on the coated gold electrode. The electrochemical electron-transfer process for both systems strongly depends on the structure and the type of substituents that are electron donors or acceptors. The experimental approach allows estimating the values of Ered o and the intrinsic barrier for the formation of the radical anions.

Original languageEnglish
Pages (from-to)7062-7068
Number of pages7
JournalJournal of Physical Chemistry C
Issue number17
Publication statusPublished - May 1 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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