Abstract

The out-of-phase (C=O)₂ stretching mode for maleic anhydrides, <i>v</i>_out-of-phase (C=O)₂, is in Fermi resonance with a <i>B</i>₁ combination tone, and the extent of Fermi resonance interaction can be altered drastically depending upon the particular solvent system used in the study. The <i>v</i>_out-of-phase (C=O)₂ <i>v</i>_in-phase (C=O)₂ modes can be differentiated by solvent system studies, since the out-of-phase mode shifts more in frequency than the in-phase mode. Both <i>v</i>(C=O)₂ modes decrease in frequency as the polarity of the solvent system increases or the amount of intermolecular hydrogen bonding increases, such as in the case of an increasing mole % concentration of chloroform.

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