Raman spectra of some transition-metal imido complexes

Abstract

Raman and i.r. spectra of mono-organoimido (RN–) complexes of tungsten, rhenium, tantalum, and niobium and of bis(imido) complexes of tungsten have been measured, including ¹⁵N substitution. Strong Raman bands near 1 350 (R = Ph), 1 295 (Me or Et), or 1 260 cm^–1(Bu^t) are attributed to symmetric stretching vibrations, while weaker Raman bands, 980–1 020 and 630–690 cm^–1, are assigned to asymmetric stretching and deformation modes, respectively, of the M–N–C linkage. The diagnostic application of Raman spectroscopy to imide chemistry is briefly discussed.