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Near‐infrared fourier transform Raman spectroscopy of indigoids
Author(s) -
Tatsch Ellen,
Schrader Bernhard
Publication year - 1995
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250260611
Subject(s) - raman spectroscopy , infrared , chromophore , fourier transform , chemistry , fourier transform infrared spectroscopy , infrared spectroscopy , fourier transform spectroscopy , indigo , spectroscopy , analytical chemistry (journal) , spectral line , photochemistry , optics , physics , organic chemistry , quantum mechanics , astronomy
Near‐infrared Fourier transform Raman spectra (3400 to — 20 cm −1 ) for the solid phases of indigo, thioindigo, selenoindigo and N,N '‐dimethylindigo were recorded with excitation using Nd:YAG laser radiation at 1064 nm. A complete vibrational assignment is proposed supported by the results of ab initio calculations. The spectra are complementary to the IR spectra recorded earlier. They also complete earlier results of resonance Raman spectroscopy. The spectra support a molecular structure of the indigo chromophore with a cross‐conjugated vinylogue amide system.