Destruction of the hydration shell around tetraaolkylammonium ions at the electrochemical interface

Akira Yamakata, Masatoshi Osawa

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)


The structure and behavior of the hydration shells around tetraethyl-, -propyl-, and -butylammonium ions (Et4N+, Pr 4N+, and Bu4N+, respectively) at a CO-covered Pt electrode was studied by surface-enhanced IR absorption spectroscopy. Selective concentration of cations at the electrochemical interface by controlling the applied potential facilitates the observation of the hydration shells without interference from hydrated anions. We report for the first time that the hydration shells around Pr4N+ and Bu4N+ are decomposed at sufficiently negative potentials because of the strong electrostatic attraction with the surface. On the other hand, the hydration shell around Et4N+, the smallest ion, is more stable and does not decompose in the potential range examined. The difference in the stability can be ascribed to the difference in the size of the central cation. On the other hand, the hydration shells are easily deconstructed on a bare Pt surface because of the stronger interaction with the surface.

Original languageEnglish
Pages (from-to)6892-6893
Number of pages2
JournalJournal of the American Chemical Society
Issue number20
Publication statusPublished - May 27 2009
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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