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Vibrational Coupling in Trans-Azobenzene and Its Isotopomers

Infrared (4000-400 cm(-1)) and Raman spectra (4000-100 cm(-1)) of six trans-azobenzene isotopomers, including the parent one, were recorded. Using mono and double N-15-labelled isotopomers, the assignment of the N=N stretching was confirmed at 1439 cm(-1) in the parent isotopomer. This vibration is strongly coupled with the phenyl mode 19b. In isotopomers with one and two perdeuterium-labelled phenyl groups the N=N stretching shifts to higher wavenumbers, since this coupling is no longer effective.

IR spectra; NIR FT Raman spectra; trans-azobenzene; vibrational coupling

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