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Laser Flash Photolysis Studies on Gallic Acid
Author(s) -
Zhu HongPing,
Zhao HongWei,
Zhang ZhaoXia,
Wang WenFeng,
Yao SiDe
Publication year - 2006
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200690248
Subject(s) - chemistry , flash photolysis , photoionization , acetonitrile , aqueous solution , excited state , photochemistry , photodissociation , ultrafast laser spectroscopy , quantum yield , laser , analytical chemistry (journal) , reaction rate constant , ionization , kinetics , atomic physics , ion , organic chemistry , optics , fluorescence , physics , quantum mechanics
The transient species of gallic acid (GA) have been studied by 266 nm nanosecond laser flash photolysis in aqueous solution and acetonitrile. The intermediate with absorption at 320 nm was identified as excited triplet state ( 3 GA*), the decay rates of which were obtained in aqueous solution and acetonitrile respectively. Energy transfer from 3 GA* to β ‐carotene was observed and the energy transfer rate constant k ent was determined to be 2.2×10 9 mol −1 ·L·s −1 . GA underwent photoionization during photolysis and the quantum yield of photoionization was determined to be 0.12 at room temperature with KI as a reference.