Raman spectral studies on interactions of Br^- ions with CD₃ group of acetonitrile, nitromethane and dimethyl sulfoxide

Abstract

Raman spectra in the CD₃ stretching region are reported for solutions of tetrabutyl ammonium bromide (TBAB) in deuterated acetonitrile (AN-d₃), nitromethane (NM-d₃) and dimethylsulfoxide (DMSO-d₆). New bands are found to appear in the low frequency regions of C---D stretching vibrations in solutions of TBAB in AN-d3 and DMSO-d6 due to the anion-molecular complexes formed whereas only an increase in half band width of the C---D stretching band is observed in solutions of TBAB in NM-d₃. Raman spectra of three component and four component systems involving TBAB, AN-d₃, NM-d₃ and water are also reported with a view to obtaining information on preferential solvation of the anions by water.