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The emission spectra of quinine and its protonated derivatives doped in sol-gels (tetraethoxysilane system) have been measured during the sol-gel transformation. Shifts in the emission spectra from 370 nm to 436 nm were observed in both cases of quinine and quinine sulfate as the system changed from sol stage to dried glass over a period of 14 days. Our results indicate that the emitting states are...