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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/121/04/0529-0534

    • Keywords

       

      Crystal violet; malachite green; rosaniline; 𝛽-cyclodextrin; guest-host interactions.

    • Abstract

       

      The rates of alkaline bleaching of triphenylmethane dyes crystal violet (CV), malachite green (MG) and rosaniline (RA) have been measured spectrophotometrically in an aqueous medium at 30°C in the presence of 𝛽-cyclodextrin (CD). At lower concentrations of CD, CV forms productive 1 : 1 (G : H) complex. At higher concentrations of CD, it forms unproductive 1 : 2 (G : H) complex. For the bleaching of MG, CD accelerates or decelerates the rate depending on pH of the medium by forming 1 : 1 (G : H) inclusion complex. Analysis of rate data shows that MG undergoes fading by mixed order process. CD decelerates the water reaction and accelerates hydroxide ion reaction. In the case of RA, both water reaction as well as hydroxide ion reaction are retarded by CD by the formation of inclusion complex.

    • Author Affiliations

       

      V Raj1 A Sarathi1 T Chandrakala1 S Dhanalakshmi1 R Sudha1 K Rajasekaran1

      1. Post Graduate and Research Department of Chemistry (DST-FIST Sponsored), Virudhunagar Hindu Nadars’ Senthikumara Nadar College, Virudhunagar 626 001

    • Dates

       
      Published
      July 2009
      Manuscript received
      18 October 2008
      Manuscript revised
      20 April 2009
      Accepted
      28 April 2009

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