Cosolvent effect on enhancement of reaction rate constant in near-critical region

Takafumi Aizawa, Siriporn Janttarakeeree, Yutaka Ikushima, Norio Saitoh, Kunio Arai, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Triplet-triplet annihilation of anthracene in supercritical carbon dioxide with and without acetonitrile cosolvent was studied with a transient absorption technique. In pure CO2, enhancement of the reaction rate was observed. Extinction coefficients and quantum yields of triplet state anthracene in the near-critical region sharply increased and decreased, respectively. In the presence of cosolvent, however, the enhancement of the reaction rate constant in the near-critical region decreased with increasing amounts of cosolvent. Under these conditions, both the extinction coefficients and quantum yields of triplet state anthracene showed less variation providing strong evidence that the cosolvent shields specific interactions between solute and the CO2 solvent.

Original languageEnglish
Pages (from-to)247-253
Number of pages7
JournalJournal of Supercritical Fluids
Volume27
Issue number3
DOIs
Publication statusPublished - 2003 Dec

Keywords

  • Acetonitrile
  • Anthracene
  • Cosolvent
  • Supercritical carbon dioxide
  • Transient absorption

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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