The shape and width of the 818 cm-1 Raman band of propan-2-ol in solutions
Annotatsiya
The width and shape of the 818 cm-1 band of propan-2-ol in the Raman spectra in aqueous and other solutions were studied. In neutral solvent (1,2-dichloroethane) the band at low contents of the alcohol (0.3 mole fraction) obviously has a dual character. The bandwidth in aqueous solutions passes through a maximum with change in concentration, and the maximum of broadening occurs in the same range of concentrations as described in the literature for the maximum of the intensity of isotropic Rayleigh scattering of light. Dilution of propan-2-ol in acetonitrile leads to the disappearance of only the low-wavenumber asymmetry of band, accompanied by its narrowing. The maximum of line broadening in aqueous solutions is explained by reconstruction of the solution structure. As a result of this reconstruction, the hydrogen atoms of the OH group of the alcohol molecules are free from H-bonding. © 1998 John Wiley & Sons, Ltd.