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Structural characterization of some quinolin‐8‐ol‐containing azo dyes in solid and solution state as probed by resonance Raman, fourier transform IR and electronic spectroscopic techniques
Author(s) -
Bajpai P. K.,
Pal Biswajit,
Baul T. S. Basu
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.1250260506
Subject(s) - raman spectroscopy , chemistry , protonation , resonance (particle physics) , fourier transform , deprotonation , solid state , fourier transform infrared spectroscopy , electronic structure , characterization (materials science) , photochemistry , crystallography , computational chemistry , analytical chemistry (journal) , materials science , organic chemistry , atomic physics , nanotechnology , optics , ion , mathematical analysis , physics , mathematics
Some 5‐(aryl)azoquinolin‐8‐ol derivatives were studied by resonance Raman, Fourier transform IR and electronic spectroscopic techniques. Analysis of vibrational and electronic spectra was used to determine the azo and hydrazone forms in both the solid and solution states. In the solid state, the compounds remain dominantly in one form and the characteristic bands due to each resonating form were identified. Various structural motifs for protonated, neutral and deprotonated states were proposed based on pH‐dependent studies. The effect of H‐bonding in stabilizing a particular type of structure is also discussed.