Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Rates and Mechanism of Fading Reaction of Magenta Azomethine Dye in Basic Solution

염기성 용액에서 마젠타 아조메틴 색소의 퇴색 반응속도와 메커니즘

  • Lee Joong-Ho (Department of Science Education, Daegu University) ;
  • Kim Jung-Sung (Department of Science Education, Daegu University) ;
  • Kim Chang-Su (Department of Science Education, Daegu University)
  • 이중호 (대구대학교 과학교육학부) ;
  • 김정성 (대구대학교 과학교육학부) ;
  • 김창수 (대구대학교 과학교육학부)
  • Published : 2005.07.01
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Abstract

A magenta azomethine dye(D) was synthesized from the reaction of 3-methyl-1-phenyl-2-pyrazoline-5-one with N,N-diethyl-1,4-phenylenediamine. The magenta azomethine dye was identified on the basis of elemental analysis, $^{13}C-NMR$, infrared, and GC/MS studies. The magenta azomethine dye was decomposed in a basic solution. Rate constants of the fading reaction of magenta azomethine dye in ethanol-water solvent were measured spectrophoto­metrically at 540 nm. Reaction rate was increased with the increase of $[OH\^{-}]\;and\;[H\_{2}O]$ in the region of $[H_{2}O]=11\~40\;M$. The reaction was governed by the following rate law. -d[D]/dt = $\{k_o\;+\;k_{OH}[OH^-][H_{2O}]\}[D]$ A possible mechanism consistent with the empirical rate law has been proposed.

Keywords

References

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