Dielektrische Verluste in verdünnter Lösung und innermolekulare Dipolbeweglichkeit bei Carbinolen / Dielectric Loss of Carbinols in Dilute Solutions and Intramolecular Dipol Orientation

Abstract

The dielectric loss of benzyl alcohol, diphenyl-and triphenylcarbinol in dilute solutions of benzene and carbon tetrachloride is measured in the microwave range from 1 to 300 GHz. The ab sorption curves can be separated into three regions, the one with the longest relaxation time is due to the overall rotation of the molecule. In both the carbinols the OH-group is hindered in its rota tion and partly it reorients with time constants which we suggest being due to the rotation of the phenyl ring. For the fast angular oscillations (libration) of the OH-group itself time constants between 0.15 and 3 ps are extrapolated.