Journal of the Chemical Society, Dalton Transactions p. 107 - 112 (1992)
Update date:2022-08-03
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Choudhury, Suranjan Bhanja
Ray, Debashis
Chakravorty, Animesh
Nickel(II) complexes of tri-and hexa-dentate ligands in which the donors are azo nitrogen, phenolic oxygen and thioether sulfur or ether oxygen have been isolated.Structure determination of three complexes has established the presence of distorted octahedral NiN2O2X2 (X = S or O) co-ordination spheres.In dichloromethane solution the nickel(III)-nickel(II) couple is electrochemically observable for the thioether complexes with E1/2 in the range 0.65-0.85 V vs. saturated calomel electrode.The blue-violet nickel(III) species can be quantitatively electrogenerated in solution.Upon freezing (77 K) axial EPR spectra (g<*> ca.2.18, g<*> ca.2.06) compatible with the uncommon hole configuration (d(x2-y2))1 are observed.The ether complexesare more difficult to oxidise and the nickel(III) species are not tractable.This is consistent with the higher strength of nickel-thioether compared to -ether binding.
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