Solvent effects in the determination of cyclopentanone by infrared spectroscopy

Abstract

The variation in frequency and intensity of each component of the Fermi resonance doublet in the carbonyl region of cyclopentanone is reported for twelve solvents. In mixed solvents the absorbance of the peak maximum is approximately the mean of that of the components when either the intensity or the amount of Fermi resonance is different for the components of the mixture. For solvents that form hydrogen bonds with cyclopentanone significant absorbance values cannot be obtained because of overlapping features caused by Fermi resonance and by different hydrogen-bonded species. The significance of the results for analytical purposes is summarised.