Abstract

Coumarin exhibits two infrared bands in the carbonyl stretching region of the spectrum. The doublet is due to Fermi resonance (F.R.) of the carbonyl stretching mode, <i>v</i>C=O, with an overtone of a lower-lying fundamental. The <i>v</i>C=O mode was corrected for F.R. in a series of solvents and solvent systems, and unperturbed <i>v</i>C=O was correlated with mole % solvent <i>A</i>/solvent <i>B</i>, and other parameters. The cause of shifts of <i>v</i>C=O in solvent systems is the result of several parameters, including bulk dielectric effects, basicity of the carbonyl group, and steric factors of both the solute and solvent.

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