title: Charge separation in DNA via consecutive adenine hopping.
abstract: Charge transfer in DNA is of current interest because of the involvement of charge transfer in oxidative DNA damage and electronic molecular devices. We have investigated the charge separation process via the consecutive adenine (A)-hopping mechanism using laser flash photolysis of DNA conjugated with naphthaldiimide (NDI) as an electron acceptor and phenothiazine (PTZ) as a donor. Upon the 355-nm laser flash excitation of NDI, the charge separation and recombination process between NDI and PTZ was observed. The yields of the charge separation via the consecutive A-hopping were slightly dependent upon the number of A bases between the two chromophores, while the charge recombination rate was strongly dependent upon the distance. The charge-separated state persisted over 300 micros when NDI was separated from PTZ by eight A bases. Furthermore, the rate constant of the A-hopping process was determined to be 2 x 10(10) s(-1) from an analysis of the yield of the charge separation depending on the number of A-hopping steps.
authors.affiliation: Institute of Scientific and Industrial Research (SANKEN), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan.
authors.forename: Tadao
authors.initials: T
authors.lastname: Takada
authors.forename: Kiyohiko
authors.initials: K
authors.lastname: Kawai
authors.forename: Xichen
authors.initials: X
authors.lastname: Cai
authors.forename: Akira
authors.initials: A
authors.lastname: Sugimoto
authors.forename: Mamoru
authors.initials: M
authors.lastname: Fujitsuka
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Majima
mesh_terms: D000225:Adenine / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D010782:Photolysis; D013050:Spectrometry, Fluorescence; D055672:Static Electricity
chemical_list: D004247:DNA; D000225:Adenine