title: Highly self-organized electron transfer from an iridium complex to p-benzoquinone due to formation of a pi-dimer radical anion complex triply bridged by scandium ions.
abstract: Unusually high kinetic order was observed in self-organized Sc3+-promoted electron transfer from tris(2-phenylpyridine)iridium(III) [Ir(ppy)3] to p-benzoquinone (Q) in propionitrile, third-order with respect to the concentration of Sc3+ and second-order with respect to the concentration of Q, to produce a pi-dimer semiquinone radical anion complex that is triply bridged by three Sc3+ ions (Q*--3Sc3+-Q).
mesh_terms: D016227:Benzoquinones / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D007495:Iridium / Q000737:chemistry*; D007700:Kinetics; D009570:Nitriles / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry; D010084:Oxidation-Reduction; D011725:Pyridines / Q000737:chemistry; D012538:Scandium / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D016227:Benzoquinones; D009570:Nitriles; D009942:Organometallic Compounds; D011725:Pyridines; C058324:2-phenylpyridine; C004532:quinone; D007495:Iridium; C005557:propionitrile; D012538:Scandium