Synthesis and kinetic study of a series of chloro- and m-carboxypyridium triazinyl reactive dyes

Huei Chin Huang, Chun Guey Wu

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Abstract

Five monochloro-s-triazinyl reactive dyes (MCT) and five m-carboxypyridium-s-triazinyl reactive dyes (NTR) were synthesised with the same red chromophore bearing an –NHCN, –OCH3, –CH3NSO2CH3, –N-methyl phenyl or –OH group as ‘second-leg’ substituents. A kinetic study of the hydrolysis of these dyes was conducted, and the rate constant (kobs) and half-life time values were determined. The kobs of the MCT and NTR dyes was found to follow the order –OCH3 > –CH3NSO2CH3 > –N-methyl phenyl > –NHCN > –OH, which was approximately in agreement with the values obtained for the Hammett substituent constants. Overall, the higher the electron-donating property of the substituent on meta-position to the leaving group in the triazine ring, the lower the hydrolysis rate constant.

Original languageEnglish
Article number109147
JournalDyes and Pigments
Volume188
DOIs
StatePublished - Apr 2021

Keywords

  • Cyanamide
  • Hammett substituent constant
  • K
  • Kinetic study
  • M-carboxypyridium triazinyl
  • N-Methyl methylsulfonyl amine
  • Rate constant
  • σ

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