Single-crystal vibrational spectrum of hexa(imidazole)cobalt(II) nitrate

Abstract

An essentially complete assignment has been deduced for the title complex from single-crystal Raman and i.r. spectral evidence and differs substantially from that of earlier qualitative work, which is reinterpreted. ν(M–N) Modes in imidazole complexes are shown to lie in the 190–250 cm^–1region, thereby supporting earlier qualitative studies of ν(M–N) for pyridine and related complexes. A prominent feature of the results is the extreme weakness of the M–N breathing mode in the Raman spectra, and the series of strong M–N–C deformational mode bands.