Abstract

Both the <i>v</i>NO₂ modes are affected by solute/solvent interaction for nitrobenzenes in CHCl₃ and/or CCl₄ 1% or less solutions. The <i>v</i>_asym.NO₂ mode decreases in frequency in the order of physical phase: vapor, CCl₄ solution, and CHCl₃ solution. The <i>v</i>_sym.NO₂ mode generally increases in frequency in going from CCl₄ solution to CHCl₃ solution. However, in the few cases when the <i>v</i>_sym.NO₂ mode decreases in frequency, this frequency decrease is a factor of ~0.5 or less than the frequency decrease for <i>v</i>_asym.NO₂. In cases where a C=O or a SO₂ group is also joined to the 4-nitrophenyl group, the SO₂ or C=O group is also affected by solute/solvent interaction. Physical factors such as intermolecular hydrogen bonding, dipolar effects, chemical effects, and steric factors of both solute and solvent appear to be involved in determining the degree of solute/solvent interaction.

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