Local excess density about substituted benzene compounds in supercritical CO2 based on FT-IR spectroscopy

N. Wada, M. Saito, D. Kitada, R. L. Smith, H. Inomata, K. Arai, S. Saito

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

IR spectra of substituted benzene compounds were measured in supercritical CO2 with an apparatus capable of in situ measurement. An experimental procedure was developed which provided reliable data and allowed quantitative analyses. The molar absorption coefficient of substituent deformation stretch and C-C ring stretch were found to vary with the system density but their density dependence was different. A method for determining the local excess density of benzene derivatives in supercritical CO2 is proposed. The expression obtained for the local excess density can be represented by a single function in terms of bulk density and exhibits a maximum just below the critical density.

Original languageEnglish
Pages (from-to)10918-10922
Number of pages5
JournalJournal of Physical Chemistry B
Volume101
Issue number50
Publication statusPublished - 1997 Dec 11

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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