• Effect of substituents on the absorption spectra andpK values of some azo dyes derived from thiobarbituric acid

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      https://www.ias.ac.in/article/fulltext/jcsc/108/05/0451-0458

    • Keywords

       

      Azo dyes; substituent effect; correlation analysis; dissociation constant

    • 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.

    • Author Affiliations

       

      Minati Kuanar1 B K Mishra1

      1. Department of Chemistry, Sambalpur University, Jyoti Vihar - 768 019, India
    • Dates

       
  • Journal of Chemical Sciences | News

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