Molecular polarisability: the molar Kerr constants of allyl halides as solutes in carbon tetrachloride

Abstract

As solutes in carbon tetrachloride at 25". allyl chloride. bromide, and iodide have molar Kerr constants ( x10l2) of 48.2.96.6, and 99.1 .and dipole moments (D) of 1-75.1.73. and 1.56. respectively. When the anisotropic carbonhalogen bond polarisabilities previously found applicable to ethyl and isopropyl halides are used, the new measurements are reconcilable with the non-planar conformations specified by Bowen, Gilchrist, and Sutton, but not with mixtures of s-cisand s-trans-conformers alone. Attempts to predict average molar Kerr constants, by assuming hindered internal rotations to be due to van der Waals and dipole-induced dipole interactions, are also described.