Potential and pH Dependencies of Adsorbed Species of 2-, 4-Pyridinethiol and 2-Pyrimidinethiol on Au(111) Electrode

Isao Taniguchi, Soichiro Yoshimoto, Yukinari Sunatsuki, Katsuhiko Nlshiyama

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Potential and pH dependencies of surface structures of Au(111) electrodes modified with 2- and 4-pyridinethiol (2-PySH and 4-PySH, respectively) and 2-pyrimidinethiol (2-PymSH) were examined by surface-enhanced IR absorption spectroscopy (SEIRAS) and STM. At positive potentials, the pKa values of the adsorbed pyridinethiol and pyrimidine species decreased, even in an acid solution the pyridine (or pyrimidine) N atom became less protonated. Therefore, STM images of self-assembled monolayers of these thiols observed at properly positive potentials (e.g.,> ca. 0.3 V vs. Ag/AgCl for 2-PySH and 2-PymSH in a 0.1 M HClO4 solution, >0.7 V vs. Ag/ AgCl for 4-PySH in a 0.01 M (M = mol dm-3) HClO4 solution) can be used for evaluating the structures in a neutral solution.

Original languageEnglish
Pages (from-to)1197-1199
Number of pages3
JournalElectrochemistry
Volume67
Issue number12
DOIs
Publication statusPublished - Dec 1999

Keywords

  • SEIRAS
  • STM
  • Self-assembled monolayer (SAM)
  • Single crystal electrode

ASJC Scopus subject areas

  • Electrochemistry

Fingerprint Dive into the research topics of 'Potential and pH Dependencies of Adsorbed Species of 2-, 4-Pyridinethiol and 2-Pyrimidinethiol on Au(111) Electrode'. Together they form a unique fingerprint.

Cite this