Cobalt dichlorobis

Cobalt, dichlorobis(AvY -dimethyl-1,2-ethanediamine)-chloride hydrate isomerization, 1, 468 Cobalt, dich orobis(l,2-ethanediamine)-base hydrolysis, 1, 304 chloride anation, 1, 469 halogen exchange, 1, 468 chloride hydrate isomerization, 1, 468 isomers, 1,191 nitrate... 

Cobalt, dichlorobis(Af,. V -dimethylethylenediamine)-chloride hydrate isomerization, 468... 

Cobalt, dichlorobis(l,2-propanediamine)-bromide hydrate halogen exchange, 468 chloride hydrate... 

The dichlorobis(ethylenediamine)cobalt(II) ion can exist in two geometrical isomers. For the trans isomer, there is a plane of symmetry that bisects the cobalt ion and the ethylenediamine ligands, leaving one Cl on either side of the plane. However, the cis isomer has no plane of symmetry so two optical isomers exist. This is also the case for [Co(en)3]3+ as is illustrated in Figure 16.3. 

The cw-dichlorobis(ethylenediamine)cobalt(III) ion is optically active. The two optical isomers are drawn below. The trans-isomer is not optically active the ion and its mirror image are superimposable. 

Lithium tetranitrodiamminecobaltate(III) Trans-dichlorobis(ethylenediamine)cobalt(III) chloride... 

Twenty grams of neutral traws-dichlorobis (ethylenedi-amine)cobalt (III) chloride (No. 131) are suspended in 30ml of water and 6.8g of potassium thiocyanate is added to the green solution. A green precipitate of the thiocyanate immediately forms. The mixture is warmed on the steam bath the suspension turns grey, and finally all the solid dissolves to yield a bluish-red solution. After the vessel is cooled in ice and the walls are scratched, the cis-product crystallizes out it is filtered off and then washed with 15ml of ice-cold water. 

Besides (carbonato)bis(ethylenediamine)cobalt(III) chloride and the corresponding bromide salt, the following complexes are described cis- and frara -dichlorobis(ethylenediamine)cobalt(III) chloride, cts-aquachlorobis(ethylenediamine)cobalt(III) sulfate, cis-bis(ethylenediamine)dinitrocobalt(III) nitrite, m-aquabis-(ethylenediamine)hydroxocobalt(III) dithionate, and cis-diaqua-bis(ethylenediamine)cobalt(III) bromide. 

The traditional method of isolating the trans-dichlorobis-(ethylenediamine)cobalt(III) chloride salt by evaporation of the reaction mixture to dryness in the steam bath gives some reduction to cobalt(II). To avoid this, the chloride salt in the following procedure is isolated by saturation of the reaction mixture with hydrogen chloride gas and by precipitation with standing at room temperature. As an alternative method, the reaction mixture from the preparation of (carbonato)bis(ethylene-diamine)cobalt(III) chloride can be used as the starting material. 

To 27.5 g. (0.1 mole) of crude (carbonato)bis(ethylenediamine)-cobalt(III) chloride is added 200 ml. of 1.00 N hydrochloric acid. The carbonato complex is dissolved with evolution of carbon dioxide gas and formation of a red solution consisting primarily of the corresponding cw-diaqua species. The solution is evaporated in the steam bath until an almost dry paste has been formed. The purple residue is filtered and washed with three 20-ml. portions of ice-cold water. Drying in air yields 19.5 g. of purple crystals of cu-dichlorobis(ethylenediamine)cobalt(III) chloride. The mother liquor and the washings are again evaporated almost to dryness to yield a second crop of crystals, 5.9 g. The total yield is 25.4 g. (84% based on (carbonato)bis(ethylenediamine)cobalt(III) chloride). The analysis and the visible absorption spectrum of the two fractions are identical. Anal. Calcd. for [Co(en)2Cl2 ] C1 H20 Co, 19.42 N, 18.46 C, 15.82 Cl, 35.05 H, 5.98. Found Co, 19.50 N, 18.57 C, 15.77 C1, 35.15 H, 6.01. 

Disodium cw-bis(ethylenediamine)disuIfitocobaltate(III) nitrate and also the perchlorate have not been reported before and are recommended as sources of the cfs-bis(ethylenediamine)disulfito-cobaltate(III) ion, which has been prepared by Baldwin1 by proceeding through a difficult series of complex salts. The m-azidobis(ethylenediamine)sulfitocobalt(III) is also newly reported it can be converted into a relatively pure sodium ran.y-bis(ethylenediamine)disulfitocobaltate(III), which has previously been made from dichlorobis(ethylenediamine)cobalt(III) chloride1 and tetraammine(carbonato)cobalt(III) chloride.2... 

Dicarbomethoxynorbomene, 578 Dicarbonyl(cyclopentadienyl)cobalt, 161-162 Di-[x-carbonylhexacarbonyldicobalt, 162-163 Dichloroacetylene, 552 Dichlorobis(cyclopentadienyl)titanium, 163—... 

Figure 10.3. (a) The lrani-dichlorobis(ethylenediamine)cobalt(III) ion, showing only the nearest-neighbor atoms in the ligands, (b) Absorption spectra of the fra s-[Co(en)2Cl2]+ ion showing the... 

Table 10.1. Symmetry of the dipole moment matrix elements in trans-dichlorobis(ethylenediamine)cobalt(III) in D4h symmetry.

During the preparation of cw-dichlorobis(2,2 -bipyridyl)cobalt(III) chloride by repeating a published procedure [1], passage of chlorine into an ice-cold solution of... 

Dichlorobenzoquinone-4-chloroimide, 2071 c/.v-Dichlorobis(2,2 -bipyridyl)cobalt(III) chloride, 3793a fraws-Dichlorobis [ 1,2-phenylenebis(dimethylarsine)]palladium(IV)... 

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