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Dielectric Polarisation of Phenol

Naturevolume 135page909 (1935) | Download Citation



IT is well known that the molecular polarisation of alcohols in a non-polar medium is exceptional in that it at first increases with concentration and then falls finally to a lower value than that at which it started. The data of Williams and Allgeier1 show that at 25° up to a molar fraction of 0.345 the polarisation of phenol in benzene is constant, whilst those of Donle and Gehrckens2 show a decrease in polarisation at 22° up to a concentration of 0.05 molar fraction phenol and those of Philip and Haynes3 an increase at 20° in dilute solutions. I have measured the polarisation of phenol in benzene at 70° with the following results: c2 is the molar fraction of phenol, ϵ is the dielectric constant, d is the density, and P2 is molecular polarisation of phenol. The molecular polarisation of benzene at this temperature is 26-928.

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  1. 1

    J. Amer. Chem. Soc., 49, 2416; 1927.

  2. 2

    Z. Phys. Chem., B, 18, 316; 1932.

  3. 3

    J. Chem. Soc., 87, 998; 1905.

  4. 4

    Donle and Gehrckens, loc. cit.

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  1. Chemistry Department, University of Aberdeen

    • A. R. MARTIN


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