Effect of oxygen-enhanced intersystem crossing on the observed efficiency of formation of singlet oxygen

Andrew J. McLean, David J. McGarvey, T. George Truscott, Christopher R. Lambert, Edward J. Land

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

The effects of O2-induced enhanced intersystem crossing (EISC) have long been recognised by workers investigating O2(1Δg) quantum yields, ϕΔ. However, no previous study employing techniques allowing direct O2(1Δg) luminescence observation has addressed itself to quantifying such effects. Employing energy-transfer techniques and investigating O2 concentration dependence of ϕΔ, allowed us to determine SΔ, the fraction of triplets quenched by O2 giving rise to O2(1Δg), under conditions where O2 EISC can and cannot operate. The values of SΔ were found to be 0.65, 0.78, 0.76, 0.74, 0.78, 0.98 and 0.31 for pyrene, perylene, PPDME, TPP, ZnTPP, phenazine and benzophenone, respectively. With the exception of phenazine and benzophenone all compounds exhibited significant EISC effects. We have also observed O2(1Δg) generation directly by O2 quenching of the first excited singlet state of perylene and pyrene.
Original languageEnglish
Pages (from-to)3075-3080
Number of pages6
JournalJournal of the Chemical Society, Faraday Transactions
Volume86
Issue number18
DOIs
Publication statusPublished - 1990

Fingerprint Dive into the research topics of 'Effect of oxygen-enhanced intersystem crossing on the observed efficiency of formation of singlet oxygen'. Together they form a unique fingerprint.

  • Cite this