Showing papers by "A. B. P. Lever published in 1986"
TL;DR: Preparation d'une serie d'especes appartenant a la chaine redox RuN 4 (cat), [RuN 4(sq)] +, [Ru N 4 (q)] 2+ N 4 =unite bis(bipyridine) ou tetrakis(pyridine), les coordinats dioxolene sont: pyrocatechol, di t-butyl-3,5 pyrocacetol, et tetrachloropyrocatechols as discussed by the authors.
Abstract: Preparation d'une serie d'especes appartenant a la chaine redox RuN 4 (cat), [RuN 4 (sq)] + , [RuN 4 (q)] 2+ N 4 =unite bis(bipyridine) ou tetrakis(pyridine), les coordinats dioxolene sont: pyrocatechol, di t-butyl-3,5 pyrocatechol, et tetrachloropyrocatechol
262 citations
TL;DR: In this article, the authors summarized research in phthalocyanine chemistry carried out in our laboratories during the last few years, including the synthesis of binuclear and polynuclear PHHs, oxygen reduction studies using PHH monolayers on graphite electrodes.
Abstract: : This paper summarizes research in phthalocyanine chemistry carried out in our laboratories during the last few years. Included herein are synthesis of binuclear and polynuclear phthalocyanines, oxygen reduction studies using phthalocyanine monolayers on graphite electrodes, emission characteristics of mono- and polynuclear phthalocyanines, electrochemical and spectro-electrochemical properties, aggregation behaviour, and consideration of the electronic coupling present in the polynuclear species. The paper finishes with a survey of recent important contributions from other laboratories.
171 citations
TL;DR: In this paper, a linear relationship linking the Ru → π * (bpy) charge transfer transition energy in the species [Ru(bipyridine) 2 XY] n + (X, Y various non-diimine ligands, n = 0, 1, 2) and the observed potentials E [Ru (III/Ru(II), E [(bpy)/(bpy − )] and their difference are investigated.
128 citations
TL;DR: In this article, the authors studied the properties of tetrasulphonated phthalocyanine (TsPc) derivatives in aqueous solution at pH 2 −10.
82 citations
TL;DR: In this article, the synthesis and characterization of bis(4t-butyl-pyridine)bis(3,5-di-t- butylcatecholato)ruthenium is reported.
Abstract: : The synthesis and characterization of bis(4-t-butyl-pyridine)bis(3,5- di-t-butylquinone)ruthenium is reported. A crystallographic molecular structure determination carried out on the complex has shown that it exists as the trans isomer and that ligand C-O lengths are relatively long for a semiquinone complex being at the bottom end of the range observed for catecholate complexes. Both quinone ligands appear structurally and electronically equivalent. The complex is diamagnetic and shows a well-resolved spectrum. Electrochemically, the complex undergoes four redox processes, all of which most likely involve both metal and quinone ligands. There are charge-transfer bands in the visible region, and an exceptionally intense and structured band in the near infrared region. The ground state is viewed as a mixture of bis(4-t-butylpyridine)bis(3, 5-di-t-bu tylsemliquinone0ruthenium(II) and bis(4-t-butylpyridine)bis(3,5-di-t- butylcatecholato)ruthenium (IV), with the former dominant.
65 citations
TL;DR: In this paper, the tris(bipyrazine)ruthenium(II) complex reacts with the aquapentacyanoferrate (II) ion, leading to a series of di-to heptanuclear pyrazine-bridged complexes, which were characterized by visible-UV and /sup 1/H NMR spectroscopy and electrochemistry.
Abstract: The tris(bipyrazine)ruthenium(II) complex reacts with the aquapentacyanoferrate(II) ion, leading to a series of di- to heptanuclear pyrazine-bridged complexes, which were characterized by visible-UV and /sup 1/H NMR spectroscopy and electrochemistry. Stopped-flow kinetics of the formation reactions were consistent with a stepwise mechanism, where the specific rates for the 1:1 to 1:6 complexes span the range 3.5 x 10/sup 4/-0.30 M/sup -1/ s/sup -1/, following very closely the electrostatic formalisms applied to bimolecular reactions. The dissociation of the polynuclear complexes proceeds by a multistep consecutive mechanism, which was completely solved for the kinetic constants of the 1:1 to 1:6 species, and observed to lie in the range 4.6 x 10/sup -4/-1.3 x 10/sup -3/ s/sup -1/, respectively. The electronic spectra contain charge-transfer bands from iron(II) and from ruthenium(II) to bipyrazine. 29 references, 5 figures.
28 citations
TL;DR: Preparation d'une serie d'especes appartenant a la chaine redox RuN 4 (cat), [RuN 4(sq)] +, [Ru N 4 (q)] 2+ N 4 =unite bis(bipyridine) ou tetrakis(pyridine), les coordinats dioxolene sont: pyrocatechol, di t-butyl-3,5 pyrocacetol, et tetrachloropyrocatechols.
Abstract: Preparation d'une serie d'especes appartenant a la chaine redox RuN 4 (cat), [RuN 4 (sq)] + , [RuN 4 (q)] 2+ N 4 =unite bis(bipyridine) ou tetrakis(pyridine), les coordinats dioxolene sont: pyrocatechol, di t-butyl-3,5 pyrocatechol, et tetrachloropyrocatechol