title: [Studies on photoinduced electron and proton transfer reactions of nucleic acid and aromatic ketone].
abstract: The transient absorption spectra of two aromatic ketones (benzophenone (BP), xanthone (XT)) and four nucleic acids (guanosine 5'-monophosphate (GMP), adenosine 5'-monophosphate (AMP), cytidine 5'-monophosphate (CMP), thymidine 5'-monophosphate (TMP)) were obtained in 1 : 1 CH3CN/H2O solution by using time-resolved laser flash photolysis at 355 nm. From the changes of the transient absorption spectra the authors can conclude that photoinduced proton transfer following electron transfer from GMP and AMP to excited BP and XT occurs, which is in accordance with free energy change of the reactions. For CMP and TMP, electron transfer and proton transfer do not appear because no ketyl and anion radical are generated. In addition, the rate constants for electron transfer from GMP, AMP, CMP, and TMP to the excited BP and XT were determined. As can be seen, there is a good correlation between kq and the free energy changes (deltaG) of the electron transfer reaction.
authors.affiliation: Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China. wjtwty@mail.ustc.edu.cn
authors.forename: Jin-Ting
authors.initials: JT
authors.lastname: Wang
authors.forename: Qian
authors.initials: Q
authors.lastname: Sun
authors.forename: Ai-Min
authors.initials: AM
authors.lastname: Ge
authors.forename: Yang
authors.initials: Y
authors.lastname: Pan
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Zhang
authors.forename: Shu-Qin
authors.initials: SQ
authors.lastname: Yu
mesh_terms: D000838:Anions; D001577:Benzophenones; D004579:Electron Transport; D004583:Electrons; D007659:Ketones / Q000737:chemistry*; D007834:Lasers; D009696:Nucleic Acids / Q000737:chemistry*; D011522:Protons; D012996:Solutions
chemical_list: D000838:Anions; D001577:Benzophenones; D007659:Ketones; D009696:Nucleic Acids; D011522:Protons; D012996:Solutions; C047723:benzophenone