Experiments were performed to elucidate the excited-state behavior of 9-phenylphenalenones, which are phototoxic plant secondary metabolites involved in mechanisms of light-mediated plant defense. Using a combination of time-resolved and steady-state UV/visible spectroscopies, time-resolved IR absorption spectroscopy, time-resolved singlet oxygen phosphorescence measurements and cyclic voltammetry, we provide evidence of an intramolecular charge-transfer process in the excited singlet and the triplet states of 9-phenylphenalenones that modulates the photosensitized production of singlet oxygen.
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1 January 2006
Phototoxic Phytoalexins. Processes that Compete with the Photosensitized Production of Singlet Oxygen by 9-Phenylphenalenones
Cristina Flors,
Peter R. Ogilby,
Javier G. Luis,
Teresa A. Grillo,
Laura R. Izquierdo,
Pier-Luigi Gentili,
Laura Bussotti,
Santi Nonell
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Photochemistry and Photobiology
Vol. 82 • No. 1
January 2006
Vol. 82 • No. 1
January 2006