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

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^*

^*Corresponding author for this work

Research output: Indexed journal article › Article › peer-review

46 Citations (Web of Science)

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.

Original language	English
Pages (from-to)	95-103
Number of pages	9
Journal	Photochemistry and Photobiology
Volume	82
Issue number	1
DOIs	https://doi.org/10.1562/2005-04-07-RA-479
Publication status	Published - Jan 2006

Keywords

Phenalenone-type phytoalexins
Triplet state energy
Pi-pi-asterisk
Charge-transfer
Molecular-oxygen
Flash-photolysis
Excited singlet
Fluid solutions
Phosphorescence
Electron

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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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doi = "10.1562/2005-04-07-RA-479",

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AU - Flors, Cristina

AU - Ogilby, Peter R.

AU - Luis, Javier G.

AU - Grillo, Teresa A.

AU - Izquierdo, Laura R.

AU - Gentili, Pier Luigi

AU - Bussotti, Laura

AU - Nonell, Santi

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KW - Phenalenone-type phytoalexins

KW - Triplet state energy

KW - Pi-pi-asterisk

KW - Charge-transfer

KW - Molecular-oxygen

KW - Flash-photolysis

KW - Excited singlet

KW - Fluid solutions

KW - Phosphorescence

KW - Electron

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Phototoxic phytoalexins. Processes that compete with the photosensitized production of singlet oxygen by 9-phenylphenalenones

Abstract

Keywords

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