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Issue 11, 1986
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Copper co-ordination chemistry of some quadridentate pyridazine and phthalazine (N4) thioether ligands. Binuclear copper(II) complexes exhibiting two-electron reduction at positive potentials

Abstract

Binuclear, hydroxo-bridged, copper(II) complexes of a series of quadridentate pyridazine and phthalazine thioether ligands involving nitrogen donor groups (derived from pyridine, imidazole, benzimidazole) exhibit room-temperature magnetic moments in the range 1.1–1.7 B.M., indicative of antiferromagnetically coupled binuclear copper(II) centres. Cyclic voltammetry and coulometry on most of these systems indicate reversible or quasi-reversible redox processes, involving two-electron transfer, at positive potentials (0.23–0.49 V vs. a saturated calomel electrode in CH3CN or dimethylformamide). Mononuclear copper(II) derivatives, involving bidentate ligands, also exhibit reduction at positive potentials. Catecholase activity involving 3,5-di-t-butylbenzene1,2-diol has been demonstrated for the hydroxo-bridged complex [Cu2(ptpd)(OH)Cl3]·EtOH [ptpd = 3,6-di(2′-pyridylthio)pyridazine], in which a Michaelis-Menten kinetic treatment gave KM= 3.4 × 10–4 mol dm–3 and a value of kp= 2.1 × 10–2 s–1 for the dissociation of the catechol–complex intermediate.

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Article type: Paper
DOI: 10.1039/DT9860002381
Citation: J. Chem. Soc., Dalton Trans., 1986,0, 2381-2386
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    Copper co-ordination chemistry of some quadridentate pyridazine and phthalazine (N4) thioether ligands. Binuclear copper(II) complexes exhibiting two-electron reduction at positive potentials

    T. C. Woon, R. McDonald, S. K. Mandal, L. K. Thompson, S. P. Connors and A. W. Addison, J. Chem. Soc., Dalton Trans., 1986, 0, 2381
    DOI: 10.1039/DT9860002381

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