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Laser-induced formation of pyrenyloxy radical from 1-hydoxypyrene and further oxidation: Micellar effects

Paper ID Volume ID Publish Year Pages File Format Full-Text
28701 44086 2006 6 PDF Available
Title
Laser-induced formation of pyrenyloxy radical from 1-hydoxypyrene and further oxidation: Micellar effects
Abstract

Laser photolysis of POH was investigated in aqueous ethanol, three organic solvents with different polarity, SDS micellar and AOT reverse micellar solutions. The analysis of the laser-induced transient absorption (TA) spectra showed that the pyrenyloxy radical (PO) was formed via a prompt deprotonation from the cation radical (POH)+. The observed micellar effects on the formation of the pyrenyloxy radical were consistent with this mechanism of formation. Based on the shift as well as the intensity of the TA peak attributable to the pyrenyloxy radical, information on the microenvironment surrounding POH (i.e., hydrophobic or hydrophilic, contact or no contact with water phase) was obtained. The secondary photochemical reaction after laser irradiation was investigated with UV/vis absorption spectroscopy. 1,6- and 1,8-pyrenediones were found to be produced as the main photoproducts.

Keywords
Laser photolysis; Micelle; Pyrenyloxy radical; Transient absorption spectroscopy; 1-Hydroxypyrene; Solvent effects
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Laser-induced formation of pyrenyloxy radical from 1-hydoxypyrene and further oxidation: Micellar effects
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 182, Issue 2, 31 August 2006, Pages 168–173
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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