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Photodegradation of 4,4-Bis(4-hydroxyphenyl)valeric acid and its inclusion complex with β-cyclodextrin in aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
26772 43976 2014 6 PDF Available
Title
Photodegradation of 4,4-Bis(4-hydroxyphenyl)valeric acid and its inclusion complex with β-cyclodextrin in aqueous solution
Abstract

•Mechanistic aspects of enhancement of diphenolic acid photodegradation in inclusion complex with β-cyclodextrin were studied by nanosecond laser flash photolysis and picosecond fluorescence.•Photoionization was found to be the main primary photochemical process.•Complexation with β-CD leads to increase both photoionization and photodegradation quantum yields of the bisphenol.•In presence of oxygen phenoxyl radical formed decays in reactions with superoxide anion-radical and self-coupling.•The main primary photoproduct is hydroxylated DPA.

Nanosecond laser flash photolysis and time-resolved fluorescence were used to study photochemistry of 4,4-Bis(4-hydroxyphenyl)valeric acid (diphenolic acid, DPA) and complex of DPA with β-cyclodextrin (DPA-βCD) in aqueous solutions. For both systems the primary photochemical process was found to be photoionization with the formation of a hydrated electron–phenoxyl radical pair. Inclusion of DPA in cyclodextrin cavity leads to the great increase of photoionization and fluorescence quantum yield (from 0.01 to 0.14) as well as fluorescence lifetime (from 0.17 to 2.9 ns) due to decreasing of the quenching rate of the singlet excited state of complexed DPA by solvent molecules.

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Keywords
Flash photolysis; Kinetics; Bisphenol; Photoionization; Phenoxyl radical; β-Cyclodextrin
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Photodegradation of 4,4-Bis(4-hydroxyphenyl)valeric acid and its inclusion complex with β-cyclodextrin in aqueous solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 274, 30 January 2014, Pages 27–32
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
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