Abstract
In the i.r. spectra of 1:1 and 2:1 complexes of thioacetamide with proton acceptors, the NH 2 symmetric stretching vibration splits into a doublet, due to Fermi resonance (FR) with the first overtone of the NH 2 bending mode. FR coupling coefficients and the distance of the unperturbed levels (Δ 0) have been determined. Δ 0 seems to be larger for 2:1 complexes. A level inversion of the FR bands, due to the change in the strength of the H-bonding to the solvent, has been detected. FR interaction has been characterized by FR displacement parameter (Δ F = Δ-Δ 0) where Δ stands for the distance between the FR bands.
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