title: Charge separation in a nonfluorescent donor-acceptor dyad derived from boron dipyrromethene dye, leading to photocurrent generation.
abstract: Boron dipyrromethene (BODIPY), which is commonly used as an energy absorbing and transferring antenna molecule, has been modified to contain an electron donor moiety, 8-(2,4,5-trimethoxyphenyl)-4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene (MEOPHBDP). The photoinduced electron transfer from a 2,4,5-trimethoxyphenyl moiety to a BODIPY moiety of MEOPHBDP in acetonitrile was observed by femtosecond laser flash photolysis measurements. The lifetime of the charge-separated state of MEOPHBDP was 59 ps at 298 K. The dye-sensitized solar cells (DSSC) were prepared using MEOPHBDP with carboxylic acid (MEOPHBDP-COOH) and a reference BODIPY dye having no electron donor moiety. The photovoltaic measurements were performed using a standard two-electrode system consisting of a working electrode and a Pt sputtered electrode in methoxyacetonitrile containing 0.5 M iodide and 0.05 M I(2). The photoelectrochemical properties of DSSC with MEOPHBDP are compared with those with a reference BODIPY dye.
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Shigeki
authors.initials: S
authors.lastname: Hattori
authors.forename: Kei
authors.initials: K
authors.lastname: Ohkubo
authors.forename: Yasuteru
authors.initials: Y
authors.lastname: Urano
authors.forename: Hisato
authors.initials: H
authors.lastname: Sunahara
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Nagano
authors.forename: Yuji
authors.initials: Y
authors.lastname: Wada
authors.forename: Nikolai V
authors.initials: NV
authors.lastname: Tkachenko
authors.forename: Helge
authors.initials: H
authors.lastname: Lemmetyinen
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi
mesh_terms: D001895:Boron / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D004563:Electrochemistry; D004583:Electrons; D007477:Ions / Q000737:chemistry*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010777:Photochemistry; D011162:Porphobilinogen / Q000031:analogs & derivatives* / Q000737:chemistry; D013053:Spectrophotometry
chemical_list: D004396:Coloring Agents; D007477:Ions; C507544:dipyrromethene; D011162:Porphobilinogen; D001895:Boron