Electrochemical analysis on the effect of ionic environment change on interfacial reaction kinetics

Deokho Jung, Hyunjin Jeon, Youngeun Kwon

Research output: Contribution to journalArticlepeer-review

Abstract

Electrochemical approaches provide useful tools for studying interfacial reactions. Interfacial reactions are often controlled by various factors in a different manner from that of bulk reactions. Understanding these differences is important for many applications. Particularly, the acid-base properties play a significant role in determining the characteristics of the surface and the reactions that take place on the surface. We investigated how the protonation and deprotonation of the surface-confined acid affected the interfacial Diels-Alder reaction occurring on gold electrode using cyclic voltammetry. The rate of Diels-Alder reaction showed a negative correlation to the extent of surface ionization, showing a response similar to a titration curve. The half maximum rate was observed at pH 7, which agreed with the pKa of surface-confined carboxylic acid. Subsequent investigation suggested that this dependence is likely due to the direct interaction of H-bonding between quinone and the surface-confined acid rather than the field effect.

Original languageEnglish
Pages (from-to)41-46
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume720-721
DOIs
StatePublished - 15 Apr 2014

Keywords

  • Cyclic voltammetry
  • Electrochemistry
  • Interfacial organic reactions
  • Self-assembled monolayers
  • Surface-confined acid

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