Far-infrared absorption intensities of H 2O and D 2O in C 6H 6

Abstract

Far-i.r. absorption intensities have been measured for H 2O and D 2O in C 6H 6 solutions. Beer's law plots were found to be nonlinear. From the plots, the equilibrium constants of dimer formation in benzene were estimated to be 2.4M -1 and 3.3M -1 for H 2O and D 2O at 20°C, respectively. Based on Onsager's reaction field and including explicitly the effect of differences in molecular size between solute and solvent molecules, the internal moment of a water molecule and the volume ratio of a molecule to a cavity were estimated from the integrated absorption intensity of a D 2O monomer in C 6H 6 as 1.98 D and 0.7, respectively