Identification of ν(N=N) in Metal Arylazo Complexes: The Infrared and Raman Spectra of some Arylazo Complexes of Rhodium(III)

Authors:
  • GRG. W. Rayner-Canham
    G. W. Rayner-Canham
  • DSD. Sutton
    D. Sutton
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Abstract
The Raman and infrared spectra have been obtained for a series of rhodium-arylazo complexes RhCl2(PPh3)2(p-XC6H4N2) where X = H, F, Br, CF3, NO2, OCH3, NEt2. The N=N stretching frequency ν(N=N) has been unambiguously identified from its strong appearance in the Raman spectrum and from isotopic substitution studies using 15N. Trends in the value of ν(N=N) with the p-substituent X are discussed, in terms of the apparent degree of metal–ligand π-interaction.