Concentration quenching of triplet phenanthrene in propan-1,2-diol

✍ Scribed by Michael J. Pilling; Margaret A. Russell

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 233 KB
• Volume: 49
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(77)80601-5

✦ Synopsis

The lifetime of triplet phenanthrene in propan-l&iiol has been studied over a range of temperatures and ground state concentrations. The results demonstrate that the pseudo-first-order decay constant is linear in scavenger concentration, and that the resulting second order rate constant is too large to be explained by impurity quenching. Ground state quenching is implicated; its temperature dependence is much weaker than that of a diffusion-controlled reaction at high temperatures (220-300 K), but it tends towards diffusion-controlled behaviour at lower temperatures (<200 K).