Abstract
A series of azo dyes from aromatic diazonium salts and thiobarbituric acid have been synthesised and their UV-Vis spectra have been recorded in neutral media and at two extremepH values. The absorption maxima have been correlated with Swain-Lupton’sF andR parameters using Williams-Norrington’s weightage factors. ThepK values of the dyes have also been determined and are highly predictable using Williams-Norrington’s model.
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Kuanar, M., Mishra, B.K. Effect of substituents on the absorption spectra andpK values of some azo dyes derived from thiobarbituric acid. Proc. Indian Acad. Sci. (Chem. Sci.) 108, 451–458 (1996). https://doi.org/10.1007/BF02869550
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DOI: https://doi.org/10.1007/BF02869550