Reaction between Molecular Oxygen and Photo-excited Protoporphyrin IX
1972; Nature Portfolio; Volume: 235; Issue: 5338 Linguagem: Inglês
10.1038/235388a0
ISSN1476-4687
AutoresJ. Dalton, Charles A. McAuliffe, David Slater,
Tópico(s)Photosynthetic Processes and Mechanisms
ResumoTHE absorption spectrum of protoporphyrin IX in tetrahydrofuran solution has maxima at 404 (Soret band), 503, 536, 576 and 633 nm. Excitation at any of these wavelengths produced an intense red emission with its maximum at 635 nm1. The same emission spectrum was observed when added biacetyl was irradiated at its 436 nm absorption. In these conditions the biacetyl phosphorescence was completely quenched. Additionally, molecular oxygen quenched the protoporphyrin IX emission spectrum following Stern-Volmer kinetics. Typical experimental results, obtained at 25° C, are plotted in Fig. 1.
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