Temperature dependence of the fluorescence properties of curcumin

Yuval Erez, Itay Presiado, Rinat Gepshtein, Dan Huppert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

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 ∼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.

Original languageEnglish
Pages (from-to)10962-10971
Number of pages10
JournalJournal of Physical Chemistry A
Volume115
Issue number40
DOIs
StatePublished - 13 Oct 2011

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