Metal–sulphur vibrations. Part I. Far-infrared spectra of some complexes of thiourea and ethylenethiourea (imidazolidine-2-thione)

Authors:
  • DAD. M. Adams
    D. M. Adams
  • JCJ. B. Cornell
    J. B. Cornell
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Abstract
The far-infrared spectra (70–400 cm.–1) of 36 thiourea and ethylenethiourea (imidazolidine-2-thione) complexes, embracing several different stereochemical types, are assigned and discussed. Metal–sulphur stretching frequencies, v(M–S), lie in the range 298–205 cm.–1 for the transition-metal complexes, and vary with co-ordination number and electron configuration in the manner now familiar from the behaviour of metal–hylogen stretching frequencies, v(M–X). For Group metals v(M–S) has been found as low as 170 cm.–1. The similarity between the spectra of thiourea complexes and those of thiocyanates has led to an assignment of the published data for thiocyanates. Some interesting variations in halogen-sensitive vibrations have been encountered.
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