Monovalent, trivalent and tetravalent nickel

Nag, Kamalaksha; Chakravorty, Animesh

doi:10.1016/s0010-8545(00)80405-1

Cited by 193 publications

(83 citation statements)

References 269 publications

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“…There is agreement in the field (see, however, Bagyinka et al [18]) that this is due to low-spin Ni(III), a 3d 7 system, in an apparently rhombically-distorted octahedral ligand field, as first proposed by Lancaster in 1980 [124] (see [165] for a theoretical treatment). Similar spectra are observed in several well characterized Ni(III) model compounds [49,89,135,146,190], some of which (e.g. [84]) are stable in air.…”

Section: Oxidized Aerobic Enzymesupporting

confidence: 79%

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Nickel hydrogenases: in search of the active site

Albracht

1994

Biochimica et Biophysica Acta (BBA) - Bioenergetics

470

479

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Section: Oxidized Aerobic Enzymesupporting

confidence: 79%

“…Magnetic Field (Gauss) are well within the range observed for either Ni(III) of Ni(I) model compounds [89,146]. It is my opinion, therefore, that the EPR signals ascribed to nickel are indeed due to unpaired spins in orbitals with mainly a 3d character of nickel.…”

Section: Oo21gsupporting

confidence: 66%

Nickel hydrogenases: in search of the active site

Albracht

1994

Biochimica et Biophysica Acta (BBA) - Bioenergetics

470

479

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“…In our laboratories, we have characterised recently (13) the bis(l,4,7-triazacyc1ononane)nickel-(111) cation, (Ni(9-aneN3)2"+) which, unlike other solvated tetraazanickel(lI1) macrocycles (14), shows only -1% decomposition at pH -3 over a 24 h period. Studies with several reducing systems have exhibited a lack of any pH dependence on electron transfer of this Ni(III)/(II) species and the reduction potential (0.945 V) renders it an appropriate outer-sphere reagent for examination of the kinetic parameters involved in redox reactions of organic substrates.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of the oxidation of benzenediols and ascorbic acid by bis(1,4,7-triazacyciononane)nickel(III) in aqueous perchlorate media

McAuley¹,

Spencer²,

West³

1985

Can. J. Chem.

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A. MCAULEY, LEE SPENCER, and P. R. WEST. Can. J . Chem. 63, 1198Chem. 63, (1985. The reactions of the outer-sphere electron transfer reagent, Ni(9-aneN&", (Dis(l,4,7-triazacyclononane)nickel(III) ion) with ascorbic acid, hydroquinone, catechol, and resorcinol have been investigated. The absence of any proton related equilibria with the oxidant provides a means of ascribing the observed inverse hydrogen ion dependences to reactions of the dissociated ascorbate or quinolate ions, (HA-). The data are consistent with the rate-determining one-electron transfer reactions: k, ~i ( 9 -a~~~~)~~' + HA-4 Ni(9-ane N-c)2" + HA followed by rapid oxidation of the radical ions formed. In the reaction with ascorbic acid, kl -0 and k 2 ( T = 25°C) = 5.2

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“…2,3 Furthermore, some hydrazones are used as quantitative analytical reagents, especially in colorimetric and fluorimetric determinations of metal ions. 4 Based on the previous studies, 5,6 the extent of p π -d π interaction between the hydrazone group and the central metal ion is determined by the type and position of the different substituents relative to the parent hydrazino compound. Also, the stability of the hydrazone chelates is higher than that of the corresponding hydrazino compounds and depends on the different substituents.…”

Section: Introductionmentioning

confidence: 99%

Complexation of some hydrazones bearing the quinoline ring: potentiometric studies

Seleem¹,

El‐Inany²,

Eid³

et al. 2006

J. Braz. Chem. Soc.

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Três hidrazonas (oxímica: MHQ, cetônica: BHQ e fenólica: AHQ) contendo o anel quinolínico foram preparadas e caracterizadas. As suas constantes de dissociação e as constantes de estabilidade dos seus complexos com alguns íons de metais de transição, lantanídeos e actinídeos foram determinadas potenciometricamente em dioxano-água 75% (v/v) a 303K. Adicionalmente, constantes de estabilidade de cobaloximas (complexos Co II -MHQ) foram determinadas a 303K em solvente-água 75% (v/v) (solvente= dioxano, isopropanol, etanol e metanol) e em 75, 70, 65, 60 e 55% (v/v) etanol-água. Uma análise de regressão linear foi usada para a estimativa das constantes de estabilidade em meio aquoso. A ordem de estabilidade de Irving-Williams não é obedecida rigorosamente.Three hydrazones (oximic: MHQ; ketonic: BHQ and phenolic: AHQ) bearing the quinoline moiety were prepared and characterized. Their dissociation constants as well as their stability constants with some transition, lanthanide and actinide metal ions have been investigated potentiometrically in 75% (v/v) dioxane-water at 303K. Also, stability constants of cobaloximes in 75% (v/v) solvent-water (solvent = dioxane, isopropanol, ethanol and methanol) as well as in 75, 70, 65, 60 and 55% (v/v) ethanol-water at 303K were evaluated. A linear regression analysis was used to evaluate the stability constants in the aqueous medium. Irving-Williams order for stability is not strictly obeyed.

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Monovalent, trivalent and tetravalent nickel

Cited by 193 publications

References 269 publications

Nickel hydrogenases: in search of the active site

Nickel hydrogenases: in search of the active site

Kinetics and mechanism of the oxidation of benzenediols and ascorbic acid by bis(1,4,7-triazacyciononane)nickel(III) in aqueous perchlorate media

Complexation of some hydrazones bearing the quinoline ring: potentiometric studies

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