The static dielectric constant of liquid acetonitrile is reported at 10, 25, and 40°C and at pressures up to 3 kbar. Densities of pure acetonitrile were measured where needed in order to analyze the dielectric measurements using the Kirkwood-Fröhlich equation. The Kirkwood correlation factorg K was found to be less than unity with a positive temperature but negative pressure coefficient, suggesting an increasing anticorrelation of dipoles with decreased temperature and increased pressure. Theg K factors are analyzed by a dipole pair-bonding model as outlined by Dannhauser and Flueckinger in which the lowg K values are attributed to the presence of dimers consisting of completely anticorrelated dipoles. The implication of this model on other measurements, especially MNR relaxation studies, is examined.
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Srinivasan, K.R., Kay, R.L. The pressure dependence of the dielectric constant and density of acetonitrile at three temperatures. J Solution Chem 6, 357–367 (1977). https://doi.org/10.1007/BF00647050
- High pressure
- dielectric constants
- temperature dependence
- Kirkwoodg factor