Abstract:
:The bimolecular rate constants (k) of quenching of molecular singlet oxygen 1O2 (1 delta g) by organo-selenium compounds exhibiting glutathione peroxidase activity and by sulfur analogs have been determined by time resolved phosphorescence detection of 1O2 in CD3OD and C6D6, with no solvent effect. The rate constants of quenching by the Se-containing compounds were found to be approximately one order of magnitude higher than those of the S-containing homologs. A linear correlation was observed between log k and the Hammett constant omega ortho with p = -0.89, the rate constant being higher for molecules with an electron-donating substituent and lower for those with an electron-withdrawing substituent. This observation is consistent with the involvement of a charge transfer complex in the deactivation of singlet oxygen.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Scurlock R,Rougée M,Bensasson RV,Evers M,Dereu Ndoi
10.1111/j.1751-1097.1991.tb02082.xsubject
Has Abstractpub_date
1991-11-01 00:00:00pages
733-6issue
5eissn
0031-8655issn
1751-1097journal_volume
54pub_type
杂志文章abstract::We study the fluorescence lifetime of the well-known 1-pyrene butyric acid (PBA) to assess oxygen concentrations in living cells. The behavior of the probe is first studied in water, ethanol, protein solution and liposome suspension. The Stern-Volmer plot of these solutions is linear, and the bimolecular reaction rate...
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journal_title:Photochemistry and photobiology
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doi:10.1111/j.1751-1097.1990.tb01803.x
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journal_title:Photochemistry and photobiology
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