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Resonance Raman spectra of sulfophthalein dyes in aqueous solutions
Author(s) -
Machida Katsunosuke,
Lee Hohi,
Uno Toyozo
Publication year - 1979
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.1250080312
Subject(s) - raman spectroscopy , aqueous solution , chemistry , phenol , resonance (particle physics) , spectral line , photochemistry , resonance raman spectroscopy , organic chemistry , physics , particle physics , optics , astronomy
Resonance Raman spectra of nine sulfophthalein dyes have been measured in aqueous solutions at various pH values between 4.0 and 11.0. Raman band assignments have been carried out by referring to the spectra of related compounds and the band shifts of Phenol Red on deuteration of the two phenol rings. The phenolsulfophthalein dyes have been ascertained to exist as a pure quinoid form in the weakly acidic solution, while in the alkaline solution they exist as a resonance hybrid of the quinoid and phenolate structures.