Acid–Base Properties of Azo Dyes in Solution Studied Using Spectrophotometry and Colorimetry

Colorimetry and spectrophotometry with chemometric data processing were used to study the acid–base properties of azo dyes in aqueous solution. The capabilities of both methods were compared. Ionization constants of all the functional groups of the azo compounds studied could be determined relative...

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Bibliographic Details
Published in:Journal of applied spectroscopy 2018-03, Vol.85 (1), p.21-26
Main Authors: Snigur, D. V., Chebotarev, A. N., Bevziuk, K. V.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
Analytical Chemistry
AQUEOUS SOLUTIONS
Atomic/Molecular Structure and Spectra
Azo compounds
AZO DYES
Colorimetry
COMPARATIVE EVALUATIONS
DATA PROCESSING
Dyes
Functional groups
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Ionization
MOLECULAR IONS
PH VALUE
Physics
Physics and Astronomy
SPECTROPHOTOMETRY
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Summary:Colorimetry and spectrophotometry with chemometric data processing were used to study the acid–base properties of azo dyes in aqueous solution. The capabilities of both methods were compared. Ionization constants of all the functional groups of the azo compounds studied could be determined relative to the change in the specific color difference depending on the acidity of the medium. The colorimetric functions of ion-molecular forms of azo compounds used as an analytical signal allow us to obtain complete information on the acid–base equilibrium in a wide acidity range.
ISSN:0021-9037
1573-8647
DOI:10.1007/s10812-018-0605-9