Study On The Chromogenic Reaction And Application Of Two Lactone Dyes

Chapter1:The classification and the properties of lecuo dyes were briefly introduced. Phthalide dyes and fluoran dyes were described in details, including the developers and the mechanism of chromogenic reaction. The research progress and applications of two lactone dyes were reviewed. Moreover, the method of solid-phase synthesis was recommended.Chapter2:The chromogenic reaction between3,3-bis(dimethyl-l-octyl-1H-indolyl-3-yl) phthalide (red-16) and some acids and metal ions were investigated by UV-Vis spectrometry. The absorption spectra of chromogenic system, the complexation ratio and dissociation constant of the complexes formed by red-16and developers were studied in details. And the effects of different surfactants, lights and temperature on the chromogenic reaction were were investigated. The results showed that the complexation ratios of the complexes were all1:1.When acids act as developers, hydrochloric acid was a good developer because that the molar absorptivity of the complex was1.976×104L·mol-1·cm-1. While Al3+and Sn4+were superior to hydrochloric acid. Anionic surfactants and nonionic surfactants made the system decolored, while cationic surfactants did not. And different temperature had no decoloration effect on the chromogenic system too. The dissociation constant the complex formed by red-16and Sn4+was small. It was indicated that the complex was more stable.Chapter3:The chromogenic reaction between9’-(2-methylphenylamino) benzofluran(purple fluroan) and some acids and metal ions were investigated by UV-Vis spectrometry. The absorption spectra of chromogenic system, absorption coefficient of the complexes formed by fluroan purple and developers were studied in details. And the effects of different surfactants on the chromogenic reaction were also investigated. The results showed that absorption coefficients of the complexes formed by purple fluroan and acids reduced by following order:αD. hydrochloric acid>αD-sulfuric acid>αD-oxalic acid>αD-phthalic acid>αD-salicylic acid (D stands for purple fluroan). Anionic surfactants and nonionic surfactants made the system decolor, while cationic surfactants did not. When metal ions act as developers, Al3+and Sn4+were superior to Fe3+And absorption coefficients of the complexes were all1.47×105mL/g·cm. It was concluded that metal ions are more suit for developers than acids in practical application.Chapter4:The complex which had high colourity and could be decolored by water was selected. Than it was synthesised by solid-phase method and used as the pigment of ink of white board marker. The ink which can be wiped by both water and rag was prepared using uniform and orthogonal experiment method.