fulltext.study @t Gmail

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

Paper ID Volume ID Publish Year Pages File Format Full-Text
26802 43979 2012 10 PDF Available
Title
Pressure effect on the excited-state proton transfer from curcumin to monols
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 pKa* < 0 can transfer a proton not only to water but also to alcohols, as curcumin does in these solvents.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pressure dependence in monols suggests that curcumin is a photoacid. ► Pressure effect on excited-state proton transfer of curcumin indicates that both solvent dynamics and proton tunneling take place. ► The excited-state proton transfer rate for curcumin in methanol and ethanol increases as the pressure increases. ► The excited-state proton transfer rate for curcumin in 1-propanol increases at low pressure, but decreases at high pressure. ► In 1-butanol and 1-pentanol the excited state proton transfer rate for curcumin is too slow for detection.

Keywords
Photoacid; Time-resolved fluorescence; Excited-state proton transfer; Nonradiative process; Turmeric; Pressure effect
First Page Preview
Pressure effect on the excited-state proton transfer from curcumin to monols
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 247, 1 November 2012, Pages 42–51
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us