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

doi:10.1562/2005-04-07-RA-479

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, 82(1):95-103 (2006). https://doi.org/10.1562/2005-04-07-RA-479

Abstract

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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Cristina Flors, Peter R. Ogilby, Javier G. Luis, Teresa A. Grillo, Laura R. Izquierdo, Pier-Luigi Gentili, Laura Bussotti, and Santi Nonell "Phototoxic Phytoalexins. Processes that Compete with the Photosensitized Production of Singlet Oxygen by 9-Phenylphenalenones," Photochemistry and Photobiology 82(1), 95-103, (1 January 2006). https://doi.org/10.1562/2005-04-07-RA-479

Received: 7 April 2005; Accepted: 28 June 2005; Published: 1 January 2006

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