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- W2136683426 abstract "Electrochemical oxidation of microcrystals of the iron(II) compound, Fe(η5-C5Ph5)2 and reduction of the corresponding iron(III) [Fe(η5-C5Ph5)2]BF4 salt, mechanically attached to graphite and gold electrodes placed in aqueous media and in a (70:30) water:acetonitrile solvent mixture containing electrolyte has been investigated by voltammetric, electrochemical quartz crystal microbalance, and micro-analytical techniques. When interconversion of Fe(η5-C5Ph5)2 to [Fe(η5-C5Ph5)2]X (X−=ClO4 −, BF4 −, Cl−, F−) and vice versa occurs at the microcrystal–electrode–aqueous electrolyte interface via redox cycling of the electrode potential, then the reaction can be summarised by the process[Fe(η5-C5Ph5)2]+[X−](solid)+e−⇌Fe(η5-C5Ph5)2(solid)+X−(solution)However, when CH3CN (in aqueous 0.1 M NaClO4) is present at the interface, data obtained are consistent with co-insertion of the organic solvent into the structure to give formally the [Fe(η5-C5Ph5)2]1+/0.5+/0 (solid) redox system containing interacting iron atoms in the solid structure. The formation of the new phase is voltammetrically associated with the conversion from the single chemically reversible one electron [Fe(η5-C5Ph5)2]+/0 process with a large separation in reduction and oxidation peak potentials (Ep red=385 mV, Ep ox=980 mV) to two formally 0.5 electron processes with more closely spaced peak potentials (first 0.5 electron reduction: Ep red=665 mV, Ep ox=715 mV; second 0.5 electron reduction: Ep red=545 mV, Ep ox=610 mV). Mechanistic aspects of the substantial changes that are introduced by the incorporation of acetonitrile into the solid state structure are discussed." @default.
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- W2136683426 date "1999-08-01" @default.
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- W2136683426 title "Novel features associated with the electrochemically driven bis(η5-pentaphenylcyclopentadienyl)iron(II)–iron(III) redox transformation at an electrode–microcrystal–solvent (electrolyte) interface" @default.
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- W2136683426 doi "https://doi.org/10.1016/s0020-1693(99)00037-7" @default.
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