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Solution Dynamics of Perfluorobenzene, Benzene, and Perdeuteriobenzene in Carbon Dioxide as a Function of Pressure and Temperature

Journal of Physical Chemistry A, ISSN: 1089-5639, Vol: 104, Issue: 4, Page: 685-691
2000
  • 37
    Citations
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  • 8
    Captures
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Metrics Details

  • Citations
    37
    • Citation Indexes
      37
  • Captures
    8

Article Description

The F, H, and H relaxation times of perfluorobenzene, benzene, and perdeuteriobenzene were measured in carbon dioxide using capillary high-pressure NMR spectroscopy. The pressure range for the measurement of the F, H, and H nuclear relaxation times was between 400 and 2300 atm over a temperature range of 298-423 K. The density regime of the solvent, carbon dioxide, over these conditions was between 0.55 and 1,27 g/cm. Over this wide range of solvent conditions, the contributions to the molecular relaxation processes for both H and F in CO were determined. These conditions were chosen to address the occurrence of specific molecular interactions between CO and fluorine. From the comparison of the relaxation processes for F and H in CO, especially at high densities, any interaction between fluorine and carbon dioxide should be prevalent. No specific interaction between fluorine and CO contributing to the molecular relaxation of these nuclei was noted over the temperature and pressure range investigated in this study.

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