title: Ultrafast excited-state intramolecular proton transfer of aloesaponarin I.
abstract: Time-resolved emission of aloesaponarin I was studied with the fluorescence up-conversion and time-correlated single-photon-counting techniques. The rates of the excited-state intramolecular proton transfer, of the solvent and molecular rearrangements, and of the decay from the excited proton-transferred species were determined and interpreted in the light of time-dependent density functional calculations. These results were discussed in conjunction with UV protection and singlet-oxygen quenching activity of aloe.
authors.affiliation: Department of Chemistry, Faculty of Science and Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan.
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Nagaoka
authors.forename: Hidemitsu
authors.initials: H
authors.lastname: Uno
authors.forename: Dan
authors.initials: D
authors.lastname: Huppert
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D003903:Deuterium / Q000737:chemistry; D006860:Hydrogen Bonding; D007700:Kinetics; D011522:Protons; D026082:Singlet Oxygen / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D000880:Anthraquinones; D011522:Protons; D012997:Solvents; C584681:aloesaponarin I; D026082:Singlet Oxygen; D003903:Deuterium