Fermi resonance and coupling effect in the NH2-group of thioacetamide

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In the i.r. spectra of 1:1 and 2:1 complexes of thioacetamide with proton acceptors, the NH2 symmetric stretching vibration splits into a doublet, due to Fermi resonance (FR) with the first overtone of the NH2 bending mode. FR coupling coefficients and the distance of the unperturbed levels (Δ0) have been determined. Δ0 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 (ΔF = Δ-Δ0) where Δ stands for the distance between the FR bands.

Original languageEnglish
Pages (from-to)935-940
Number of pages6
JournalSpectrochimica Acta Part A: Molecular Spectroscopy
Issue number11
Publication statusPublished - 1980


ASJC Scopus subject areas

  • Engineering(all)

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