Erez, Yuval Presiado, Itay Gepshtein, Rinat Huppert, Dan The Effect of a Mild Base on Curcumin in Methanol and Ethanol Steady-state and time-resolved emission techniques were employed to study the effect of acetate, a mild base, on the luminescence of curcumin in methanol and ethanol. We found that the steady-state emission intensity as well as the average fluorescence decay time are reduced by a factor of 5 when the acetate concentration is raised to about 1.8 M. We attribute this large effect to an excited-state proton transfer (ESPT) from the acidic groups of curcumin to the acetate anion. We analyze the experimental data in terms of an ESPT reaction occurring between a photoacid and a base. curcumin;fluorescence decay time;ESPT reaction;Mild Base;emission intensity;acetate anion;acetate concentration;acidic groups;1.8 M 2012-03-08
    https://acs.figshare.com/articles/journal_contribution/The_Effect_of_a_Mild_Base_on_Curcumin_in_Methanol_and_Ethanol/2542291
10.1021/jp300003a.s001