1999 年 67 巻 6 号 p. 558-562
Raman spectra were measured for the mixture of alkali metal propionates and water in the composition range of hydrate melt to highly concentrated solution. Band positions and band widths for the C1-C2 stretching, C-O stretching in the propionate anion, and O-H stretching bands in water molecule were investigated for various compositions and temperatures. The dependence of Raman bands on composition, cation, and temperature is discussed in view of ion-ion, ion-water, and water-water interactions, suggesting that the direct interaction between cation and anion increases with decreasing water content.