Molecular polarisability. The electronic anisotropy of the CAr–CF3 group

Abstract

Molar Kerr constants and apparent dipole moments at 25° are recorded for the molecules p-XC₆H₄·CF₃(X = H, F, Cl, CF₃), C₄F₅·CF₃, and m-C₆H₄·(CX₃)₂(X = H, F) in carbon tetrachloride and the data have been analysed to provide the anisotropic electron polarisability for the C_Ar–CF₃ group. The results are compared with those for C_Ar–CX₃(X = H, CH₃, Cl) for evidence of hyperconjugation.