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Abstract:
A wide range of pharmaceutical compounds have been identified in the environment, and their existence is a topic of growing concern, both for human and ecological health. The work described here has investigated the photolytic properties of L(+)-alpha-phenylglycine (L-alpha-PG-H) in aqueous solution as it can be degraded by photo-catalysis. In 266 nm laser flash photolysis of aqueous solution of L-alpha-PG-H saturated with nitrogen, two transient absorption bands are observed at 280-330 nm and 450-800 nm, respectively, due to L-alpha-PG-H radical cation and hydrated electrons (e(aq)(-)). Then e(aq)(-) reacts with L-alpha-PG-H to form the L-alpha-PG-H radical anion. Decaying rate constants of e(aq)(-) observed at 720 nm is to be 8.9 x 10(8) dm(3) mol(-1) s(-1). The rate constant for oxidation of L-alpha-PG-H by SO4- is calculated as 4.5 x 10(8) and 4.3 x 10(8) s(-1) mol(-1) dm(3), respectively. The dissociation constants (pKa) of L-alpha-PG-H is 3. Excited triplet of L-alpha-PG-H in solution is formed by laser flash photolysis. The quench rate constant of L-alpha-PG-H excited triplet (k(s)) is determined to be 1.3 x 10(7) dm(3) mol(-1) s(-1) and k(0) is equal to 1.7 x 10(5) s(-1).
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ENVIRONMENTAL CHEMISTRY LETTERS
ISSN: 1610-3653
Year: 2010
Issue: 1
Volume: 8
Page: 25-31
2 . 0 5 1
JCR@2010
1 5 . 0 0 0
JCR@2023
JCR Journal Grade:2
CAS Journal Grade:3
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 0
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