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The effect of caffeine on the reactions of the excited singlet state of pyrene in micellar sodium lauryl sulfate

✍ Scribed by Shuichi Hashimoto; J.Kerry Thomas

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
716 KB
Volume
109
Category
Article
ISSN
0009-2614

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✦ Synopsis

The effect of caffeine on a few photo-induced reactions of pyrene in micellar sodium lauryl sulfate (NaLS) has been studied. In these systems caffeine complexes with the pyrene (KassO = 85 i 10 Xl-') and also wi;h the other reactants, e.g. Cuzf or Tl+. The efiiciencies of reactions which involve contact, i.e. pyrene escimer formation, and quenching by TI+ ions to give the triplet state of pyrene, are significantly reduced in the presence of caffeine, due to geometric inhibitions formed by the complesation processes_ The kinetics of photo-induced electron transfer, e. g_ between escited pyrene and Cu2+, are not affected. However, 1he subsequent reactions of the products are modified and the yield of ionic products is markedIy increased_ '.'olurnr 109. number 2 CHE.\lICAL PHYSICS LETTERS

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