Nickel III

Nickeli-. nickelic, nickeli-, nickel(III). -cyan-wasserstoffsSure,/. nickelicyanic acid, cyano-nickelic(,II) acid. 

Nickeli-oxyd, n. nickelic oxide, nickel(III) oxide, -verbindung, /. nickelic compoimd, nickel (III) compound. 

This has been regarded as nickel(III) and also as nickel(IV) dimethylglyoxime. t The weight of steel to be taken will naturally depend upon the nickel content. The final nickel concentration should not exceed 0.6 mg per 100 mL because a precipitate may form above this concentration. 

By considering electron configurations, suggest a reason why iron(III) is readily prepared from iron(ll) but the conversion of nickel(II) and cobalt(II) into nickel(III) and cobalt(III), respectively, is much more difficult. 

The oxidation of hydrazine follows the change in surface completely since it oxidizes rapidly on bare nickel and again on the nickel(III) oxide surface but in the intermediate potential region, where the surface is covered with nickel(II) hydroxide, the anodic oxidation cannot occur (Fleischmann etal., 1972d). 

Nickel(II) sulfide, NiS (millerite) nickel(II, III) sulfide, NisSa (polymidite) nickel(III) sulfide, Ni3S2 nickel sulfide, Ni3S2 (heazelwoodite) nickel sulfide, NiS2 (vaesite) nickel selenide, NiSc2 nickel(II) selenide, NiSe nickel telluride, NiTc2 (melonite). 

Oxygenation of the Ni1 complex (39) leads to 02 activation and 0-0 bond rupture with formation of a deep purple bis(/i-oxo)nickel(III) complex (40) supported by thioether ligands.184 Its electronic structure has been investigated by spectroscopic and DFT methods.185... 

Bis(tripeptido)nickelate(III) complexes of Gly3, GlyAlaGly, and GlyGlyAla, formed by the addition of excess tripeptide to solutions of (tripeptido)nickel(III), have been observed in solution and characterized by means of electronic spectra, EPR, reduction potentials, and rate measurements. Coordination was found to be a function of pFl, with N50 coordination occurring at... 

Levee, J. et al., J. lnorg. Nucl. Chem., 1974, 36, 997-1001 Interaction may be explosive in the presence of finely divided nickel fluoride or silver difluoride, or nickel(III) oxide or silverQ oxide, or if initiated by local heating. The mechanism is discussed. 

Alkylnickel amido complexes ligated by bipyridine have been prepared that undergo reductive elimination of V-alkyl amines (Equation (54)).207,208 Unlike the phosphine-ligated palladium arylamides, these complexes underwent reductive elimination only after oxidation to nickel(III). Thermally induced reductive elimination of alkylamines from phosphine-ligated nickel complexes appears to occur after consumption of phosphine by arylazides 209... 

Nickel(III) xanthates, Ni(S2COR)3, with R = Me, Et, Pr, z-Pr, Bu, z-Bu, sec-Bu, can be quantitatively generated in acetonitrile solution by electrooxidation of anionic [Ni(S2COR)3] or by oxidative addition of ethyldixanthogen, [EtOC(S)S]2 to Ni(S2COEt)2. Solutions of Ni(S2COR)3 readily disproportionate into Ni(S2COEt)2 and [EtOC(S)S]2.240... 

Neve et al. [547] digested the sample with nitric acid. After digestion the sample is reacted selectively with an aromatic o-diamine, and the reaction product is detected by flameless atomic absorption spectrometry after the addition of nickel (III) ions. The detection limit is 20mg/l, and both selenium (IV) and total selenium can be determined. There was no significant interference in a saline environment with three times the salinity of seawater. 

Chloride substitution kinetics of [NiniL(H20)2]3+, and its protonated form [NiniL(H20)(H30)]4+, where L = 14 -oxa-1,4,8,11 -tetraazabicy-clo[9.5.3]nonadecane, yield fyn20)2 = 1400 M 1s 1 and (h2o)(H3o+) = 142M 1s V The reverse, chloride dissociation, reactions have (h2o)ci = 2.7 s 1 (h3o+)ci = 0.22 s All four reactions occur through dissociative interchange mechanisms, like earlier-studied substitutions at nickel(III) (359). 

Manganese trichloride oxide, 4141 Mercury(I) oxide , 4613 Mercury(II) oxide, 4605 Molybdenum(IV) oxide, 4716 Molybdenum(VI) oxide, 4717 Nickel(II) oxide, 4821 Nickel(III) oxide, 4823 Nickel(IV) oxide, 4822 Niobium(V) oxide, 4818 Osmium(IV) oxide, 4833 Osmium(VIII) oxide, 4858 Palladium(II) oxide, 4825 Palladium(III) oxide, 4848 Palladium(IV) oxide, 4835... 

The kinetics and mechanisms of substitution reactions of metal complexes are discussed with emphasis on factors affecting the reactions of chelates and multidentate ligands. Evidence for associative mechanisms is reviewed. The substitution behavior of copper(III) and nickel(III) complexes is presented. Factors affecting the formation and dissociation rates of chelates are considered along with proton-transfer and nucleophilic substitution reactions of metal peptide complexes. The rate constants for the replacement of tripeptides from copper(II) by triethylene-... 

In recent years there has been a tendency to assume that the mechanisms of substitution reactions of metal complexes are well understood. In fact, there are many fundamental questions about substitution reactions which remain to be answered and many aspects which have not been explored. The question of associative versus dissociative mechanisms is still unresolved and is important both for a fundamental understanding and for the predicted behavior of the reactions. The type of experiments planned can be affected by the expectation that reactions are predominantly dissociative or associative. The substitution behavior of newly characterized oxidation states such as copper-(III) and nickel (III) are just beginning to be available. Acid catalysis of metal complex dissociation provides important pathways for substitution reactions. Proton-transfer reactions to coordinated groups can accelerate substitutions. The main... 

The sluggish substitution properties of copper(III) and nickel(III) peptide complexes have permitted the isolation of complexes with these oxidation states (14, 15). Thus, the tri-valent peptide complexes pass through a cation exchange resin which readily strips copper(II) or nickel(II) from the corresponding complexes. We now have a little more information about the substitution characteristics of the trivalent metal complexes. 

Nickel(III) peptide complexes have a tetragonally-distorted octahedral geometry as shown by electron spin resonance studies (19) and by reaction entropies for the Ni(III,II) redox couple (17). Axial substitutions for Ni(III)-peptide complexes are very fast with formation rate constants for imidazole greater... 

Cu (H G ) in Figure 1. The two protonated nickel(III) complexes then undergo substitution reactions for the terminal peptide nitrogen with rate constants of 0.94 s 1 and 17 s 1, respectively (21). It is interesting that the corresponding nickel(II) complexes have similar but somewhat larger rate constants. Thus, Ni (H gG )H dissociates with a rate constant of... 

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