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The effect of the solvent in dipole moment measurements: The moment of ethylene bromide

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Summary

1. The polarisations of ethylene bromide have been measured in four solvents, benzene, toluene, carbon tetrachloride and cyclohexane at infinite dilution and over the temperature range 10° to 40°C.

2. The moments calculated from the polarisation values differ considerably from solvent to solvent, and show an increase of about 0·08 × 10−18 e.s.u. over the temperature range investigated.

3. With the help of recent data for the magnitude and direction of the group moment—CH2 Br, the potential energies between the rotating parts of the ethylene bromide in the different solvents have been calculated, and compared with the values obtained by recalculating from the measurements hitherto reported for ethylene bromide and also for ethylene chloride and ethylene chlorobromide.

4. The characteristic effect of benzene on the moment of ethylene bromide is probably best explained on the basis of the hemispherical domes of influence around the benzene ring postulated by E. Mack Jr. and having their origin in the oscillation of the double bonds in the benzene molecule.

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Authors and Affiliations

  1. Indian Institute of Science, Bangalore

    M. A. Govinda Rau & B. N. Narayanaswamy

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  1. M. A. Govinda Rau
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  2. B. N. Narayanaswamy
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Govinda Rau, M.A., Narayanaswamy, B.N. The effect of the solvent in dipole moment measurements: The moment of ethylene bromide. Proc. Indian Acad. Sci. (Math. Sci.) 1, 14–27 (1934). https://doi.org/10.1007/BF03035684

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  • DOI: https://doi.org/10.1007/BF03035684

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