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• W2324415252 endingPage "9016" @default.
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• W2324415252 abstract "Eight hetero- and homometal complexes 1−6, containing the metal centers NiIIFeIIINiII (1), MnIIINiII (2), NiIINiII (3a−c and 4), ZnIINiII (5), and ZnIIZnII (6), are described. The tridentate ligation property of the metal complexes tris(pyridine-2-aldoximato)nickel(II) and tris(1-methylimidazole-2-aldoximato)nickel(II) with three facially disposed pendent oxime O atoms has been utilized to generate the said complexes. Complex 1 contains metal centers in a linear arrangement, as is revealed by X-ray diffraction. Complexes were characterized by various physical methods including cyclic voltammetry (CV), variable-temperature (2−290 K) magnetic susceptibility, electron paramagnetic resonance (EPR) measurements, and X-ray diffraction methods. Binuclear complexes 2−6 are isostructural in the sense that they all contain a metal ion in a distorted octahedral environment MN3O3 and a second six-coordinated NiII ion in a trigonally distorted octahedral NiN6 geometry. Complexes 1−4 display antiferromagnetic exchange coupling of the neighboring metal centers. The order of the strength of exchange coupling in the isostructural NiII2 complexes, 3a−c, and 4, demonstrates the effects of the remote substituents on the spin coupling. The electrochemical measurements CV and square wave voltammograms (SQW) reveal two reversible metal-centered oxidations, which have been assigned to the Ni center ligated to the oxime N atoms, unless a Mn ion is present. Complex 2, MnIIINiII, exhibits a reduction of MnIII to MnII and two subsequent oxidations of MnIII and NiII to the corresponding higher states. These assignments of the redox processes have been complemented by the X-band EPR measurements. That the electrooxidized species [3a]+, [3b]+, [3c]+, and [4]+ contain the localized mixed-valent NiIINiIII system resulting from the spin coupling, a spin quartet ground state, St = 3/2, has been confirmed by the X-band EPR measurements." @default.
• W2324415252 created "2016-06-24" @default.
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• W2324415252 date "2007-08-25" @default.
• W2324415252 modified "2023-10-11" @default.
• W2324415252 title "Tridentate Facial Ligation of Tris(pyridine-2-aldoximato)nickel(II) and Tris(imidazole-2-aldoximato)nickel(II) To Generate Ni^IIFe^IIINi^II, Mn^IIINi^II, Ni^IINi^II, and Zn^IINi^II and the Electrooxidized Mn^IVNi^II, Ni^IINi^III, and Zn^IINi^III Species: A Magnetostructural, Electrochemical, and EPR Spectroscopic Study" @default.
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• W2324415252 doi "https://doi.org/10.1021/ic701073j" @default.
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