Premium
Resonance Raman spectra of p ‐hydroxyazobenzene and its ring deuterated derivatives in the strongly acidic solution
Author(s) -
Machida Katsunosuke,
Lee Hohi,
Saito Yutaka,
Uno Toyozo
Publication year - 1978
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.1250070404
Subject(s) - raman spectroscopy , chemistry , resonance (particle physics) , ring (chemistry) , hydrochloric acid , solvent , deuterium , spectral line , stereochemistry , organic chemistry , atomic physics , physics , astronomy , optics
Resonance Raman spectra of p ‐hydroxyazobenzene (HAB) and its three ring deuterated derivatives have been measured in the strongly acidic solution. The observed Raman bands have been assigned by referring to the spectra of related compounds and the deuteration effect. The NN stretching band of HAB in the solution of 20% hydrochloric acid undergoes a high frequency shift by about 60 cm −1 on changing the solvent to 20% deuterochloric acid. In the strongly acidic solution HAB has been confirmed to exist as a resonance hybrid between the azo and the hydrazone forms, of which the former is predominant. A normal coordinate analysis of a simplified model, CNHNC 6 H 4 p OH, has been carried out to give a good agreement between the calculated and the observed frequencies.