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