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Resonance Raman spectra and excitation profiles of some rifamycins
Author(s) -
Angeloni L.,
Marzocchi M. P.,
Smulevich G.
Publication year - 1984
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.1250150205
Subject(s) - raman spectroscopy , chromophore , excitation , chemistry , resonance (particle physics) , molecule , molecular vibration , vibronic spectroscopy , spectral line , vibronic coupling , molecular physics , atomic physics , analytical chemistry (journal) , photochemistry , physics , optics , organic chemistry , quantum mechanics , astronomy , chromatography
The resonance Raman Spectra of rifamycin SV, its sodium salt and rifampicin have been investigated under various physical conditions. The excitation profiles of the strongest Raman bands have been measured using an Ar + laser for excitation. The proposed vibrational assignment indicates that thegroup is the main portion of the chromophore for both rifamycin SV Na salt and rifampicin molecules. Excitation profile studies of the δ(CO − ) and ν(COH) vibrations indicate the presence of a single electronic transition in the visible region. In addition these two modes derive their intensities from 0–1 vibronic transitions whereas no evidence for the contribution due to the 0–0 term is found. This is explained in terms of coupling with the other totally symmetric modes and broadening due to phonon‐electron interactions.