Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 115, Issue 40, Pages 10962-10971Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp206176p
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Funding
- James-Franck German-Israeli Program in Laser-Matter Interaction
- Israel Science Foundation
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Steady-state and time-resolved techniques were employed to study the nonradiative process of curcumin dissolved in ethanol and 1-propanol in a wide range of temperatures. We found that the nonradiative rate constants at temperatures between 175-250 K qualitatively follow the same trend as the dielectric relaxation times of both neat solvents. We attribute the nonradiative process to solvent-controlled proton transfer. We also found a kinetic isotope effect on the nonradiative process rate constant of similar to 2. We propose a model in which the excited-state proton transfer breaks the planar hexagonal structure of the keto-enol center of the molecule. This, in turn, enhances the nonradiative process driven by the twist angle between the two phenol moieties.
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