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Excited states interaction of polycyclic aromatic hydrocarbons with diphenyliodonium chloride: The effective one electron reduction potential of diphenyliodonium cation

Paper ID Volume ID Publish Year Pages File Format Full-Text
29132 44124 2008 7 PDF Available
Title
Excited states interaction of polycyclic aromatic hydrocarbons with diphenyliodonium chloride: The effective one electron reduction potential of diphenyliodonium cation
Abstract

The interaction of diphenyliodonium (DPI) cation with the excited singlet and triplet states of polycyclic aromatic hydrocarbons (PAHs) was investigated in acetonitrile solution. The kinetics of quenching was determined by time resolved experiments and the triplet and radical ions quantum yields were measured by laser flash photolysis. In the case of PAHs with short singlet lifetime (<10 ns) the singlet quenching is not an important process due to the limited solubility of DPI chloride in acetonitrile. On the other hand, for those with excited singlet lifetimes of tens of nanoseconds or longer, the singlet quenching becomes significant. However, in these cases an important decay route of the radical ion pair is intersystem crossing to the triplet state. For the triplet quenching reaction, the charge separation process is highly efficient with near 100% of the quenching events leading to radicals. Singlet and quenching rate constants fall on the same correlation with the reaction driving force. The experimental data can be fitted to a Rehm–Weller mechanism with normal parameters when a value of −0.7 V versus SCE is used for the reduction potential of DPI.

Keywords
Polycyclic aromatic hydrocarbons; Excited states; Diphenyliodonium; Electron transfer
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Excited states interaction of polycyclic aromatic hydrocarbons with diphenyliodonium chloride: The effective one electron reduction potential of diphenyliodonium cation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issue 1, 10 June 2008, Pages 18–24
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
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100% Money Back Guarantee
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