Abstract
The amount of Fermi resonance (F.R.) interaction between <i>v</i><sub>o.p.</sub> (C=O)<sub>2</sub> and a combination tone of phthalic anhydride varies systematically with change in the volume percent ratios of the solvents such as CHCl<sub>3</sub>/CCl<sub>4</sub> and (CH<sub>3</sub>)<sub>2</sub>SO/CCl<sub>4</sub>. Correction for F.R. shows that <i>v</i><sub>o.p.</sub> (C=O)<sub>2</sub> decreases 5.2 cm<sup>−1</sup> while the combination tone increases 3.2 cm<sup>−1</sup> in going from CCl<sub>4</sub> solution to CHCl<sub>3</sub> solution. At 23.1 volume % CHCl<sub>3</sub>/CCl<sub>4</sub>, the bands in F.R. (1789 and 1776 cm<sup>−1</sup>) have equal intensity, and in this unique case both bands result from equal contributions from <i>v</i><sub>o.p.</sub> (C=O)<sub>2</sub> and the combination tone. The solute/solvent interaction in the (CH<sub>3</sub>)<sub>2</sub>SO/CCl<sub>4</sub>-phthalic anhydride system is even larger than that for the CHCl<sub>3</sub>/CCl<sub>4</sub>-phthalic anhydride system.
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