Abstract
Solvent induced changes in frequency and intensity of the carbonyl band of five methyl alkyl ketones have been studied. Infrared spectra of MeCOR ketones (RMe, Et, iBu, sBu, tBu) in solution have been measured. Solvents with different polarity properties have been used and the results compared with data obtained for vapor in a previous work. Equations proposed by different authors relating solution values to those measured in gas phase have been considered, but they show limited validity for the systems studied. However a relationship between empirical scales of solvent polarity and carbonyl band frequencies was established that allowed calculation of a ν gas value very close to the experimental value. Significant linear correlations between intensity of the studied band and G parameter were also found (they are worse if π* is used) and the calculated intensity value for the gas phase is an acceptable estimation of the experimental one.
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