Abstract

The amount of Fermi resonance (F.R.) interaction between <i>v</i>_o.p. (C=O)₂ and a combination tone of phthalic anhydride varies systematically with change in the volume percent ratios of the solvents such as CHCl₃/CCl₄ and (CH₃)₂SO/CCl₄. Correction for F.R. shows that <i>v</i>_o.p. (C=O)₂ decreases 5.2 cm⁻¹ while the combination tone increases 3.2 cm⁻¹ in going from CCl₄ solution to CHCl₃ solution. At 23.1 volume % CHCl₃/CCl₄, the bands in F.R. (1789 and 1776 cm⁻¹) have equal intensity, and in this unique case both bands result from equal contributions from <i>v</i>_o.p. (C=O)₂ and the combination tone. The solute/solvent interaction in the (CH₃)₂SO/CCl₄-phthalic anhydride system is even larger than that for the CHCl₃/CCl₄-phthalic anhydride system.

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