Tris cobaltate, oxidation

Cobalto-cobaltic Oxide, Tri-cobalt Tetroxide, Co304, is the essential constituent of commercial oxide of cobalt. It is produced when either of the other oxides is strongly heated in air, and when cobalt nitrate is ignited. 

CoNii 0 S4CMHt4, Cobail(II), teliakis(l,3-dihy-dro-1 -methyl-2ff-iinidazole-2-thione)dinitiato-. 23 171 CoNaO, Sodium cobah oxide, 22 56 CoNa 4C>2, Sodium cobalt oxide, 22 56 CoNao MO, Sodium cobalt oxide, 22 56 CoNao.7402, Sodium cobalt oxide, 22 56 CoNatTTO], Sodium cobalt oxide. 22 56 COOiCijH, Cobalt(I), dKatbonyKii -penta-methylcyclopentadienyl)-, 23 15 CoO CijHi,. CobaltCni), tris(2.4-pentaiiedion-ato, 23 94... 

The kinetics of oxidation of Pseudomonas aeruginosa azurin, bean plastocyanin, and Rhus v. stellacyanin by the tris-cobalt(iii) complexes of phen and three of its derivatives have been reported (Table 15) the reactivity order for Co(phen)3 + as the oxidant (stellacyanin > plastocyanin > azurin) matches that found previously for the Fe(edta) reduction of the proteins (and for which ionic strength and pH effects have now been reported). It is suggested that the activation parameters for electron transfer from reduced plastocyanin and azurin may be accounted for in terms of oxidant-induced protein structural changes which expose active sites that are, by comparison with stellacyanin, inaccessible to reagent attack. Segal and Sykes have extended the work with plastocyanin and Co(phen)3 + to higher concentrations (up to 4.0 X 10 mol of oxidant and have observed a deviation from linearity in the... 

Cobalt, dinitratobis[tris(dimethylamino)phosphine oxide]-angular parameters, 1,57... 

When electrochemical oxidation of Co metal is carried out in an acetonitrile solution of phosphinothiol ligands, tris(phosphinothiolate)cobalt(III) compounds are formed.1039 The octahedral P,S-chelated Co(2-(Ph2P)-6-(Me3Si)C6H3S)3 compound has been characterized structurally. 

Although such acceleration factors were applied by Fisher et al. [129] in their discussion of the corrosion of Co alloys, there are only a few papers trying to establish the experimental acceleration factors for disk materials. One of these is the work of Novotny et al. [154], These authors observed that carbon-coated CoCr, CoPt, or CoP disks, when exposed to elevated humidity and temperature, show an accumulation of a corrosion product, similar to those seen on uncoated alloys, on the top surface of the carbon. For both overcoated and uncoated disks, oxides and hydroxides of cobalt were detected on the surface, but there was no detectable Cr, Pt, or P. The amount of Co was on the average less on the C-covered disks. The surface Co resulted... 

Balthis and Bailar6 obtained tris (ethylenediamine) chromium-(III) complexes by the oxidation of chromium(II) solutions, using a procedure somewhat similar to that used for the synthesis of cobalt (III) com plexes. Mori7 described the preparation of hexaamminechromium(III) salts from the oxidation of chromium (II) salts in the presence of ammonia. The results obtained in both syntheses have been erratic.8,9 Berman noted that the foregoing syntheses are rendered dependable by the use of a catalyst of activated platinum on asbestos. Schaeffer,100 in a subsequent study, independently used colloidal platinum as a catalyst but reported some difficulty in separating it from the product.106 The procedures recommended and described here are based on the use of platinized asbestos as the catalyst. 

Table VII lists three precursor complexes of the type tris(phenolato)cobalt(III) and four compounds containing only one coordinated phenolate (146, 152). In the cyclic voltammograms of [Com(LBu2)] and [Com(LBuMet)] three reversible, ligand-centered, one-electron oxidation waves are observed. On the time scale of a Cou-lometric experiment, only the monocations [Com(LBu2 )]+ and [Com(LBuMet )]+ are stable and were spectroscopically characterized. In contrast, [Conl( L,Bu2)(acac)]+ undergoes a reversible one-electron oxidation yielding the dication [Com(T/Bu2 )(acac)]2+, which is fairly stable in solution.

Tri-ethylene diamine Cobalt hydroxide [Co(en)3](OH)2 Cooxen Good solvating properties, extensive oxidative degradation, coloured (claret)... 

On the other hand, Tilley et al. have reported a synthesis of a well-defined tris(tert-butoxy)siloxy-iron(lll) complex [13] as well as respective molecular siloxide complexes of cobalt [14] and copper [15], which appear to become precursors for their grafting onto silica and application as catalysts for oxidation of alkanes, alkenes and arenes by hydrogen peroxide. 

The liquid polymer is converted to the rubbery state by reagents that react with mercaptan (-SH) and side groups of the polymer segments by oxidation, addition or condensation to effect sulfide (-S-S-) bond formation. The oxidation reactions are exothermic and accelerated by an alkaline environment. The most commonly employed oxidizing agents which are suitable for curing liquid polymers are cobalt or manganese or lead octoate, p-quinonedioxime and di- or tri-nitrobenzene. Epoxy resin also reacts with liquid polysulfide polymers by addition in the presence of an aliphatic or aromatic amine and polyamide activator as shown in Equation 5.8 ... 

It has been shown that mononuclear cobalt superoxo complexes react with 2,4,6-tri-t-butyl-phenol. The anion [Co(CN)5(02)]3 acts as a base in the oxidation of the phenol. The neutral complex Co(salptr)(Oz) forms a peroxy adduct with 2,4,6-tri-t-butylphenol. An X-ray study on this adduct has revealed the structure shown in (10).m... 

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