Raman and I.R. Spectra of the NH and ND Stretching Region in Polycristalline Imidazole, exp 15 N and D Substituted Analogs

摘要

I.R. and Raman Spectra of imidazole and eleven exp 15 N and D substituted analogs have been analysed, in the region 3300-1800 cm exp -1 . The broad bands with fine structure observed correspond to two spectral features: a) The overall broad bands are attributed to associated NH(D)...N stretching vibrations. Observed nu NH exp 15 N shifts are 10 to 15 cm exp -1 in I.R. which is more than expected for pure nu NH. This is probably due to nu NH coupling with external modes. b) The fine structure is interpreted as due to interactions by Fermi resonance of nu NH(D) with overtones and combinations of internal modes. Considering the temperature and exp 15 N shifts, transmission windows or Evans holes rather than band maximum are found to correspond to overtone and combination values. (Atomindex citation 11:524718)