Journal article
Copper co-ordination chemistry of some quadridentate pyridazine and phthalazine (N4) thioether ligands. Binuclear copper(II) complexes exhibiting two-electron reduction at positive potentials
Dalton Transactions, (11), pp 2381-2386
1986
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 CH
3
CN 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 [Cu
2
(ptpd)(OH)Cl
3
]·EtOH [ptpd = 3,6-di(2′-pyridylthio)pyridazine], in which a Michaelis-Menten kinetic treatment gave
K
M
= 3.4 × 10
-4
mol dm
-3
and a value of
k
p
= 2.1 × 10
-2
s
-1
for the dissociation of the catechol-complex intermediate.
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Details
- Title
- Copper co-ordination chemistry of some quadridentate pyridazine and phthalazine (N4) thioether ligands. Binuclear copper(II) complexes exhibiting two-electron reduction at positive potentials
- Creators
- Tai Chin WoonRobert McDonaldSanat K MandalLaurence K ThompsonSean P ConnorsAnthony W Addison
- Publication Details
- Dalton Transactions, (11), pp 2381-2386
- Publisher
- Royal Society of Chemistry
- Number of pages
- 6
- Resource Type
- Journal article
- Academic Unit
- Chemistry
- Scopus ID
- 2-s2.0-37049089327
- Other Identifier
- 991019173834704721