Abstract
The CO stretching frequencies in the Raman spectra of 0.10 M solutions of tetramethylurea in seventeen solvents have been recorded. These frequencies exhibit a linear relationship with the solvent electron acceptor number. Comparison of the slopes of these lines and those obtained from analyzing literature data of ν(CO) reveals a correlation with the bond polarity. A linear correlation between (ν hexane −ν soln)/ν hexane and the solvent acceptor number is also shown. The slopes of these latter plots can be related to ν hexane and it is suggested that this approach be used to explain the specific solvent—solute interaction contributions to solvent-induced vibrational frequency shifts. This method is compared with the solvato-chromic method and it is shown that solvent acidity strongly influences the observed vibrational frequency shifts for the CO moiety of tetramethylurea.
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