Apparent anisotropic polarisabilities for the three carbon-halogen bonds involved in isopropyl halides are deduced from relevant observational data.REFERENCES were recently made to unpublished measurements of the molar Kerr constants of isopropyl chloride, bromide, and iodide. We here record relevant observational details and deduce the apparent anisotropic polarisabilities of the three carbon-halogen bonds involved.
EXPERIMEXTALThe isopropyl halides were prepared as directed by Vogel.2 Apparatus and procedures have been d e ~c r i b e d . ~ Measurements and results are set out in Tables 1 and 2
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.
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