Abstract
Uncoupled OD stretching Raman spectra were measured for aqueous solutions of magnesium salts, urea, thiourea, DMF, and DMSO. From the wavenumber changes of the uncoupled OD stretching Raman spectrum (ν A) with solute concentration, it is shown that urea is classified as a structure maker. There are three types of the ν A wavenumber variations in aqueous electrolyte solutions with solute concentration. There is little ν A wavenumber variation in aqueous DMSO solution with solute concentration.
