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, 13C-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 [H2O] in the region of [H2O]= 11～40 M. The reaction was governed by the following rate law.
-d[D]/dt = {ko + kOH[OH-][H2O]}[D]
A possible mechanism consistent with the empirical rate law has been proposed.

• 이중호(대구대학교 과학교육학부) | Joong-Ho Lee Corresponding Author
• 김정성(대구대학교 과학교육학부) | Jung-Sung Kim
• 김창수(대구대학교 과학교육학부) | Chang-Su Kim