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Dielectric Relaxation Processes of some Aromatic-COCl Molecules

Abstract Dielectric absorption studies of five molecules having the CH 2 (X=Cl, Br, and I) group attached to an aromatic ring have been made in a polystyrene matrix. In three cases the group relaxation process has been completely separated from the molecular process. The enthalpy of activation for group rotation of CH 2 Cl is virtually identical with reported findings for n.m.r. studies and theoretical calculations for benzyl chloride while the value for CH 2 Br is of the order of the lower limit obtained by such approaches.