title: Photoinduced intercomponent excited-state decays in a molecular dyad made of a dinuclear rhenium(I) chromophore and a fullerene electron acceptor unit.
abstract: A novel molecular dyad, 1, made of a dinuclear {[Re2(μ-X)2(CO)6(μ-pyridazine)]} component covalently-linked to a fullerene unit by a carbocyclic molecular bridge has been prepared and its redox, spectroscopic, and photophysical properties - including pump-probe transient absorption spectroscopy in the visible and near-infrared region - have been investigated, along with those of its model species. Photoinduced, intercomponent electron transfer occurs in 1 from the thermally-equilibrated, triplet metal/ligand-to-ligand charge-transfer ((3)MLLCT) state of the dinuclear rhenium(I) subunit to the fullerene acceptor, with a time constant of about 100 ps. The so-formed triplet charge-separated state recombines in a few nanoseconds by a spin-selective process yielding, rather than the ground state, the locally-excited, triplet fullerene state, which finally decays to the ground state by intersystem crossing in about 290 ns.
authors.affiliation: Dipartimento di Scienze Chimiche, Università di Messina and Centro Interuniversitario per la Conversione Chimica dell'Energia Solare (SOLAR-CHEM; sezione di Messina), Messina, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Nastasi
authors.forename: Fausto
authors.initials: F
authors.lastname: Puntoriero
authors.forename: Mirco
authors.initials: M
authors.lastname: Natali
authors.forename: Miriam
authors.initials: M
authors.lastname: Mba
authors.forename: Michele
authors.initials: M
authors.lastname: Maggini
authors.forename: Patrizia
authors.initials: P
authors.lastname: Mussini
authors.forename: Monica
authors.initials: M
authors.lastname: Panigati
authors.forename: Sebastiano
authors.initials: S
authors.lastname: Campagna
mesh_terms: D004583:Electrons; D004735:Energy Transfer; D037741:Fullerenes / Q000737:chemistry*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D011724:Pyridazines / Q000737:chemistry*; D012211:Rhenium / Q000737:chemistry*; D013057:Spectrum Analysis; D013997:Time Factors; D014050:Toluene / Q000737:chemistry
chemical_list: D037741:Fullerenes; D011724:Pyridazines; D014050:Toluene; C062482:pyridazine; D012211:Rhenium