Abstract
The frequency and the integrated intensity of the three normal vibrational modes of the ICN molecule are determined in several solvents. The spectroscopic perturbations are mainly a lowering of the frequency and an intensity enhancement of the ν CI vibration, a strong intensity diminution of the ν CN vibration and a small frequency shift of the δ ICN vibration. These perturbations are more pronounced for complexing solvents like carbonyl and pyridine bases than for weak electrondonor solvents like nitrobenzene or nitromethane. These effects are discussed in terms of electronic charge transfer effects occurring between the ICN and the solvent molecules. A linear relationship was found between the lowering of the force constant of the IC bond and the pK a of the pyridine derivatives.
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