Abstract
The present work describes the enhanced photochemical degradation of natural dye Curcumin in acetonitrile-water mixture in the presence of fluoride upon irradiation with light. The strong basicity of fluoride modifies the solvent environment around Curcumin molecule leading to alkaline mediated degradation of Curcumin which is further accelerated by irradiation with light. The photochemical degradation of Curcumin is studied using absorption and fluorescence spectroscopy and verified using infrared spectroscopy and fluorescence lifetime studies. The results of the work indicate that the method of Curcumin irradiation can be used as a sensing technique for fluoride detection in a wide range.
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