Determination of rate constants of 1O2 consumption by 1O2 acceptors in weakly deactivating solvents

✍ Scribed by U. Opriel; K. Seikel; R. Schmidt; H.-D. Brauer

• Book ID: 103993398
• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 840 KB
• Volume: 49
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(89)87128-x

✦ Synopsis

The rate constants kibs of '02 consumption were measured directly in CS2 for eight '02 acceptors using the time-resolved technique. The values obtained agree well with the values of k&S in toluene and benzene which were estimated indirectly from the reactivity parameter p previously determined in self-sensitized or sensitized photo-oxygenation experiments. Only the measurements of the self-sensitized photo-oxygenation of 9,10diphenylanthracene (DPA) and 9,10-dimethylanthracene (DMA) in CS2 yield values of p which are consistent with a long lifetime of '0, of rA = 34 ms in this solvent. The determination of /3 from measurements of the self-sensitized photo-oxygenation in CS2 results in p values which are too high for the rest of the '02 acceptors, indicating that the lifetime of lo2 in CS2 is strongly reduced in these experiments. The same behaviour is observed for the selfsensitized photo-oxygenation of DPA and DMA in Freon 113.