title: Phototoxic phytoalexins. Processes that compete with the photosensitized production of singlet oxygen by 9-phenylphenalenones.
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.
authors: Grup d'Enginyeria Molecular, Institut Químic de Sarrià, Universitat Ramon Llull, E-08017, Barcelona, Spain.
authors: Cristina
authors: C
authors: Flors
authors: Peter R
authors: PR
authors: Ogilby
authors: Javier G
authors: JG
authors: Luis
authors: Teresa A
authors: TA
authors: Grillo
authors: Laura R
authors: LR
authors: Izquierdo
authors: Pier-Luigi
authors: PL
authors: Gentili
authors: Laura
authors: L
authors: Bussotti
authors: Santi
authors: S
authors: Nonell
mesh_terms: D043803:Phenalenes / Q000737:chemistry*; D010777:Photochemistry; D010936:Plant Extracts / Q000737:chemistry*; D012717:Sesquiterpenes; D026082:Singlet Oxygen; D012997:Solvents; D013053:Spectrophotometry; D013056:Spectrophotometry, Ultraviolet; D013729:Terpenes; D000094162:Phytoalexins
chemical_list: D043803:Phenalenes; D010936:Plant Extracts; D012717:Sesquiterpenes; D012997:Solvents; D013729:Terpenes; D026082:Singlet Oxygen; D000094162:Phytoalexins