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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

DOI: 10.1039/DT9860002381

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 2381 - 2386 (1986)

Update date:2022-08-04

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Authors:

Woon, Tai ChinWoon, Tai Chin

McDonald, RobertMcDonald, Robert

Mandal, Sanat K.Mandal, Sanat K.

Thompson, Laurence K.Thompson, Laurence K.

Connors, Sean P.Connors, Sean P.

Addison, Anthony W.Addison, Anthony W.

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Article abstract of DOI:10.1039/DT9860002381

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-butylbenzene-1,2-diol has been demonstrated for the hydroxo-bridged complex *EtOH , 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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