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Quenching of MgTPP and ZnTPP fluorescence by molecular oxygen

Paper ID Volume ID Publish Year Pages File Format Full-Text
27718 44039 2008 5 PDF Available
Title
Quenching of MgTPP and ZnTPP fluorescence by molecular oxygen
Abstract

The rate constants for the quenching by oxygen of the lowest excited singlet states of two model metalloporphyrins, MgTPP and ZnTPP, have been measured in acetonitrile, ethanol and toluene and the data used to determine the quenching mechanism. The quenching rates are close to, but significantly slower than, diffusion-limited and do not scale with the solvent viscosity. Quenching via charge transfer in the encounter complex is a minor process even in polar solvents. The major quenching process involves spin-allowed S1–T2 radiationless relaxation of the metalloporphyrin in the 3(M⋯O2) encounter complex, a process that has a small apparent potential energy barrier.

Keywords
Fluorescence quenching; Metalloporphyrins; Oxygen; Excited singlet states
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Quenching of MgTPP and ZnTPP fluorescence by molecular oxygen
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 195, Issues 2–3, 15 April 2008, Pages 223–227
Authors
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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
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Any Questions? feel free to contact us