Abstract
The vC=O frequency for ethylene carbonate is in Fermi resonance with the first overtone of the skeletal breathing mode, and the extent of Fermi interaction is affected by solvent/solvent interaction. The vC=O frequencies have been corrected for Fermi resonance, and the corrected vC=0 frequencies have been correlated with the mole % CHCl3/CCl4, (CH3)2SO/CCl4,(CH3)2SO/CHCl3, and CHCl3/n-C6H14, the solvent reaction field, and vC=O for acetone recorded in the same solvents. Solute/solvent interactions are discussed. The acceptor number of the solvent vs. the vC=O frequencies apparently correlates in a different manner for the solvents which form intermolecular hydrogen bonds with the solute. Steric factors are suggested as being one of the reasons that the AN values and vC=O frequencies do not give nonambiguous correlations. The vC=O mode for ethylene carbonate shifts continuously to lower frequency as the mole % CHCl3 or (CH3)2SO increases in each of the solvent mixtures studied.
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