Solvent Polarity Parameters of Supercritical Carbon Dioxide as Measured by Infrared Spectroscopy.

• Ikushima Yutaka

  Government Industrial Research Institute, Tohoku

• Saito Norio

  Government Industrial Research Institute, Tohoku

• Arai Masahiko

  Institute for Chemical Reaction Science, Tohoku University

• Arai Kunio

  Department of Biochemistry and Chemical Engineering, Tohoku University

抄録

The solvent polarity parameters of supercritical carbon dioxide were determined as a function of the temperature and pressure within the ranges 318–353 K and 5.85–28.5 MPa. An infrared (IR) spectroscopic technique has been employed to determine the values of π^* dipolarity/polarizability and the Lewis basicity parameter B_MeOD by measuring the transitions in the IR absorption wavelength of functional groups (such as C=O and O–H···BA, where BA is a hydrogen-bond acceptor), in supercritical carbon dioxide. Ultraviolet/visible (UV/vis) spectroscopy was used to determine the value of the Kamlet-Taft’s solvatochromic acidity partameter, α. The B_MeOD-value was enhanced with density, but was very small at the temperatures and pressures examined, almost the same as that for hexane. The α-value tended to be dependent on density at lower pressures, but was remarkably smaller compared with those for alcohols. The π^*-value significantly increased with an increase in the density, becoming more negative at higher temperatures above 10 MPa. Furthermore, the E_T(30)-value was estimated by using the determined π^*-value. A reliable E_T(30)-value for supercritical carbon dioxide has been obtained.

収録刊行物

• Bulletin of the Chemical Society of Japan

  Bulletin of the Chemical Society of Japan 64 (7), 2224-2229, 1991

  公益社団法人 日本化学会

キーワード

• General Chemistry

詳細情報

• CRID: 1390282679093867264
• NII論文ID: 130001978767
• DOI: 10.1246/bcsj.64.2224
• COI: 1:CAS:528:DyaK3MXlvFSqsr0%3D
• ISSN: 13480634
• ISSN: 00092673
• ISSN: http://id.crossref.org/issn/00092673
• Web Site: https://academic.oup.com/bcsj/article-pdf/64/7/2224/56188046/bcsj.64.2224.pdf
• 本文言語コード: en
• データソース種別:
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