DIELECTRIC-PROPERTIES OF WATER PLUS 2-METHYLPYRIDINE SOLID MIXTURES

The complex electric permittivity of 2-methylpyridine + water solid mi xtures was measured. The considerable permittivity dispersion found in the megahertz region was discussed in terms of the effect of the wate r enclosure on rotations of the organic component. The proposed mechan isms of the dielectric relaxation in the system under test are based o n the assumption of small cooperative movements of dipolar guest molec ules inside rigid host cavities or on the concept of dipolar reorienta tion conjugated with phonons. The activation energy of the process res ponsible for relaxation was estimated as 38 +/- 2 kJ mol(-1). (C) 1997 Elsevier Science B.V.