Pressure effect on the excited-state proton transfer from curcumin to monols

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Time-resolved emission techniques were employed to study the pressure effect on curcumin's luminescence in several aliphatic alcohols. We found that the hydrostatic pressure of up to 2 GPa affects the decay rate of curcumin emission in the same way it affects the protonated form of many photoacids. We therefore propose that curcumin, which has two phenol groups, is a strong photoacid. Strong photoacids with pK a* < 0 can transfer a proton not only to water but also to alcohols, as curcumin does in these solvents.

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume247
DOIs
StatePublished - 1 Nov 2012

Funding

FundersFunder number
Israel Science Foundation

    Keywords

    • Excited-state proton transfer
    • Nonradiative process
    • Photoacid
    • Pressure effect
    • Time-resolved fluorescence
    • Turmeric

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