title: Photoinduced energy and electron transfer in phenylethynyl-bridged zinc porphyrin-oligothienylenevinylene-C60 ensembles.
abstract: Donor-bridge-acceptor triad (Por-2TV-C(60)) and tetrad molecules ((Por)(2)-2TV-C(60)), which incorporated C(60) and one or two porphyrin molecules that were covalently linked through a phenylethynyl-oligothienylenevinylene bridge, were synthesized. Their photodynamics were investigated by fluorescence measurements, and by femto- and nanosecond laser flash photolysis. First, photoinduced energy transfer from the porphyrin to the C(60) moiety occurred rather than electron transfer, followed by electron transfer from the oligothienylenevinylene to the singlet excited state of the C(60) moiety to produce the radical cation of oligothienylenevinylene and the radical anion of C(60). Then, back-electron transfer occurred to afford the triplet excited state of the oligothienylenevinylene moiety rather than the ground state. Thus, the porphyrin units in (Por)-2TV-C(60) and (Por)(2)-2TV-C(60) acted as efficient photosensitizers for the charge separation between oligothienylenevinylene and C(60).
authors.affiliation: Instituto de Nanociencia, Nanotecnología y Materiales Moleculares (INAMOL), University of Castilla-La Mancha Campus de la Fábrica de Armas, Toledo 45072, Spain.
authors.forename: Maxence
authors.initials: M
authors.lastname: Urbani
authors.forename: Kei
authors.initials: K
authors.lastname: Ohkubo
authors.forename: D M Shafiqul
authors.initials: DM
authors.lastname: Islam
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi
authors.forename: Fernando
authors.initials: F
authors.lastname: Langa
mesh_terms: D002264:Carboxylic Acids / Q000737:chemistry*; D004579:Electron Transport; D004735:Energy Transfer; D037741:Fullerenes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008665:Metalloporphyrins / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D013876:Thiophenes / Q000737:chemistry*; D014753:Vinyl Compounds / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: C416673:C60 carboxyfullerene; D002264:Carboxylic Acids; D037741:Fullerenes; D008665:Metalloporphyrins; D013876:Thiophenes; D014753:Vinyl Compounds; D015032:Zinc