Measurement of solubilities for rhodium complexes and phosphine ligands in supercritical carbon dioxide

Yusuke Shimoyama, Masanori Sonoda, Kaoru Miyazaki, Hidenori Higashi, Yoshio Iwai, Yasuhiko Arai

Research output: Contribution to journalArticle

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Abstract

The solubilities of phosphine ligands and rhodium (Rh) complexes in supercritical carbon dioxide were measured with Fourier transform infrared (FT-IR) spectroscopy at 320 and 333 K and several pressures. Triphenylphosphine (TPP) and tris(p-trifluoromethylphenyl)-phosphine (TTFMPP) were selected as ligands for the Rh complex. The solubilities of the fluorinated ligands and complexes were compared with those of the non-fluorinated compounds. The solubilities of ligand increased up to 10 times by the fluorination. It was found that the solubilities of Rh complexes were enhanced up to 30 times by introducing trifluoromethyl group to the ligand. The experimental data was correlated by the Chrastil equation. The correlated results were in good agreement with the experimental data. Furthermore, the solvation numbers of carbon dioxide around the ligands and Rh complexes were obtained from the slope of the Chrastil equation. The solvation number for the fluorinated compounds was about two and five times higher than those of the non-fluorinated ligand and complex, respectively.

Original languageEnglish
Pages (from-to)266-272
Number of pages7
JournalJournal of Supercritical Fluids
Volume44
Issue number3
DOIs
Publication statusPublished - Apr 1 2008

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phosphine
Rhodium
rhodium
phosphines
Carbon Dioxide
carbon dioxide
Carbon dioxide
solubility
Solubility
Ligands
ligands
Solvation
solvation
Fluorination
fluorination
Fourier transform infrared spectroscopy

All Science Journal Classification (ASJC) codes

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

Cite this

Measurement of solubilities for rhodium complexes and phosphine ligands in supercritical carbon dioxide. / Shimoyama, Yusuke; Sonoda, Masanori; Miyazaki, Kaoru; Higashi, Hidenori; Iwai, Yoshio; Arai, Yasuhiko.

In: Journal of Supercritical Fluids, Vol. 44, No. 3, 01.04.2008, p. 266-272.

Research output: Contribution to journalArticle

Shimoyama, Yusuke ; Sonoda, Masanori ; Miyazaki, Kaoru ; Higashi, Hidenori ; Iwai, Yoshio ; Arai, Yasuhiko. / Measurement of solubilities for rhodium complexes and phosphine ligands in supercritical carbon dioxide. In: Journal of Supercritical Fluids. 2008 ; Vol. 44, No. 3. pp. 266-272.
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