Broad band absorption of solutes in liquid solutions and in polystyrene

Abstract

Broad band absorptions in the frequency range 20 to 100 cm−1 arising from four polar solutes in polystyrene matrices have been observed at 302 K and compared with those in liquid benzene or cyclohexane solutions. A broad band was also found for 1,4-diacetylbenzene in a polystyrene matrix at 124 K. The broad band absorption still occurs in the far-infrared region when group and/or molecular relaxation(s) occur in appreciably lower frequency regions. The significance of these absorptions is discussed in terms of some models which account for the origins of broad band absorptions.