Ammines, cobalt

The hexamine cobalt (II) complex is used as a coordinative catalyst, which can coordinate NO to form a nitrosyl ammine cobalt complex, and O2 to form a u -peroxo binuclear bridge complex with an oxidability equal to hydrogen peroxide, thus catalyze oxidation of NO by O2 in ammoniac aqueous solution. Experimental results under typical coal combusted flue gas treatment conditions on a laboratory packed absorber- regenerator setup show a NO removal of more than 85% can be maitained constant. 

Keywords Flue gas denitration, NO oxidation, ammine cobalt complex, activated carbon INTRODUCTION... 

Rate Constants for Aquation and for Base Hydrolysis of Selected penta-ammine-Cobalt(III) Complexes a... 

Dictiloro - aquo - triammino - cobaltic Chloride (Dichro -chloride), [Co (NH,)3H20.Cl 2]Cl, may be prepared from trinitrato-tri-ammine cobalt by treatment with concentrated sulphuric acid and subsequent treatment with concentrated hydrochloric acid, or from trinit.ro-triammino-cobalt on treatment with concentrated hydrochloric acid.2... 

Ammino-derivatives op Cobalt Salts—Cobaltous Salt Ammines—Cobaltic Salt Ammines—Mononuclear Cobalt-ammines containing One Atom of Cobalt in the Molecule—Cobaltic Salts with Trivalent Cation—Cobalt-ammines Containing Divalent Cation—Cobalt-ammines containing Monovalent Cation—Cobalt-ammines consisting of Non-dissociable Complex— Cobalt-ammines containing Monovalent Anion—Cobalt Salts containing Trivalent Anion—Polynuclear Cobalt-ammines containing Two or more Cobalt Atoms in the Molecule—Cobalt-ammines of Unknown Constitution— Ionisation Metamerism—Polymerisation Isomerism—Valency Isomerism —Co-ordination Position Isomerism—Isomerism due to Asymmetric Cobalt Atoms. 

Studies of nitrosopentamminecobaitic saits such as red complex [Co(NH3)s (NO)] (N03)ar 0.5HjO. They are not listed in our tables 20a)J.L.Mil ward et al, JCS 1938, 233-6 CA 32, 8296(1938) (Constitution of nitrosopent-ammine cobalt salts, among them the compd listed in the previous reference) 2l)R. Duvai, CR 206, 1652-4(1938) CA 32, 5720 (1938) [Studies of trinitrotriamminocobalt (III) [Co(NHs)3 (NOj)s] (See item Co2 in table B) 22)W.Strecker E.Schwinn,JPraktChem 152, 205-18(1939) CA 33, 5314(1939)1 Introduction of the azide group into complex compds to replace Cl was studied. Among the compds prepd were several ammines such as diamminecadmium(II)azide, diam-minecopper(II) azide, tetramminecopper(II) azide, chloropentamminechrome(lll) azide, hexamminechrome(Ul) azide and hexam-minenickel(II) azide (See items Cdl, Cr5,... 

The suggested mechanism of exchange between DgO and the hcxa-ammine-cobalt(III) ion is... 

Co2Ti04 Prep, from Ti(OR)4 and ammine-cobalt complex n... 

Observation Yellow crystals of the hexa ammine cobalt(III) chloride are formed. 

Molecular shapes and 1H chemical shift patterns for chloro-ammine cobalt(III) compounds. Different environments for ammonia molecules in some complexes are defined by eq and ax subscripts, with the two types opposite different types of ligand leading to different magnetic environments and chemical shifts (8). 

NH3, Ammines, cobalt complex. 29 170-172 ruthenium(III), 26 66,67 NI3C14H34, Ammonium, tetrabulyl-, (triiodide), 29 42... 

Al , Ga , and In catalyse the aquation reaction of malonatopenta-ammine-cobalt(ni). The kinetic data may be rationalized in terms of the reaction sequence (17) and (18) " ... 

Gould and co-workers point out that for reactions of carboxylato-ammine cobalt(iii) complexes, on comparing the four reductants Cr +, V +, Eu +, and U ", it is the most reactive of the four, U +, which shows the greatest sensitivity to steric effects of substituents (as defined by Taft s E parameter). They relate this behaviour to a detailed consideration of the geometry of the /-orbital which provides the transferring electron. ... 

Orhanovic and Earley and Thompson and Sykes have measured rates of reduction of various ammine-cobalt(iii) complexes. They find strong base catalysis, according to equation (32) for the dichlorobisethylenediamine complexes, or otherwise equation (33), > with equation (34) as a limiting form at high acidities. ... 

CaHi9CIC0N5O5, trans-Chlorobis(dimethylglyoximato)(ammine)cobalt-(III) monohydrate, 40B, 917... 

Competition between NO2" and NH3 as leaving groups has been established for the aquation of nitro(ammine)cobalt(iii) complexes in weakly alkaline media. The trans effect of N-bonded NO2" ion is believed to be important here, although the effect is not so marked as with iS-bonded sulphite ion. 

Such criteria cannot be simultaneously satisfied in the case of the NHa group. Studies have thus been undertaken to examine the mode of interaction of complexes where such a group is the potential bridging site. The reductions of penta-ammine cobalt complexes of urea, carbamate, N-cyanoguanidine [N=C—N=C(NH2)2l, and cyanamide (N=C—NHa), by chromium(n) involve an outer-sphere path with the exception of the carbamato-species, where, however, there is no evidence of a nitrogen-bonded chromium(in) species as product. The cyanamide-complex reaction follows the rate law... 

The kinetics of the reaction with fi-amido-/x-hydroxo-bis[tetra-ammine-cobalt(in)] follows a rate law of the type... 

In the reduction of the chromium(m) complexes (H20)5Cr "X where X = HjO, F, Cl, Br, NCS, N3, and SCN, the second-order reactions are markedly dependent on acidity, in contrast with the reactions of the penta-ammine cobalt analogues where there are no sufficiently acidic protons. The rate law is of the form... 

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