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Photolysis of sulfosalicylic acid in aqueous solutions over a wide pH range

Paper ID Volume ID Publish Year Pages File Format Full-Text
29112 44122 2006 7 PDF Available
Title
Photolysis of sulfosalicylic acid in aqueous solutions over a wide pH range
Abstract

Nanosecond laser flash photolysis, absorption and fluorescent spectroscopy were used to study the influence of pH on the photophysical and photochemical processes of 5-sulfosalicylic acid (SSA) in aqueous solutions. Information on the excited singlet state intramolecular proton transfer (ESIPT) of the SSA ions could be deduced from the dependence of the quantum yield and the spectral maximum of SSA fluorescence on the pH of the medium. The main photochemical active form of SSA at pH < 10 is the dianion (HSSA2−). Excitation of this species gives rise to the HSSA2− triplet state, to the SSA2− radical anion and to the hydrated electron. In a neutral medium, the main decay channels of these intermediates are T–T annihilation, recombination and capture by the HSSA2− dianion, respectively. A decrease of pH leads to an increase of the second-order rate constants of disappearance of both HSSA2− triplet state and SSA2− radical anion due to their protonation.

Keywords
Sulfosalicylic acid; Laser flash photolysis; Photoionization; Triplet–triplet absorption; Hydrated electron
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Photolysis of sulfosalicylic acid in aqueous solutions over a wide pH range
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 181, Issue 1, 5 July 2006, Pages 37–43
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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