Infrared absorption studies on some derivatives of xanthic, dithiocarbamic and trithiocarbonic acids

Abstract

The infrared absorption spectra of some of the derivatives of xanthic dithiocarbamic and trithiocarbonic acids are studied in the sodium chloride optics region and the bands assigned to group frequencies. The position of C-O-C and C=S bands in the derivatives of xanthic acid has been discussed from theoretical and experimental evidences and it is suggested that the two strong bands around 1200 and 1030 cm^-1 are due to the group. The bands around 980 and 1050 cm^-1 in the derivatives of dithiocarbamic and trithiocarbonic acids respectively have been assigned to C=S group frequencies. These bands shift to lower frequency in the corresponding ionic compounds while the bands around 1030 and 1200 cm^-1 in the ionic compounds of xanthic acid shift to higher and lower frequencies respectively.