Ethylenediamine, anhydrous with cobalt

One hundred and sixty grams of cobalt (II) chloride 6-hydrate in 500m) of water are added to a mixture of 540ml of water with 60g of anhydrous ethylenediamine. The reddish solution is transferred to a 2-liter suction flask fitted with a stopper and a gas-inlet tube reaching almost to the bottom of the vessel. A vigorous stream of air is drawn through the liquid for 6 hours the color becomes dark ruby-red. 

Five grams of anhydrous ethylenediamine are dissolved in 12ml of ice-cold water, and Sml of concentrated nitric acid are added. The cooled, partly neutralized, solution is mixed with 11.5g of cobalt (11) nitrate 6-hydrate,and 6g of sodium nitrite in 20ml of water. 

Bridged hydroxy complexes (208) of the bisoxalate type have been known for many years. Both a trihydrate and an anhydrous form are known. The trihydrate is isomorphous with the corresponding cobalt(III) complex (Durrant s salt) and the hydrous complex is slowly converted to the hydrate on exposure to moisture. Only a preliminary crystallographic characterization has appeared " it crystallizes as a meso rather than racemic complex. IR and magnetic studies are in accord with the hydroxy-bridged structure. Despite the crystallographic meso structure, the resolution of the complexes has been reported either photochemically or with cis- — )bis(ethylenediamine)dinitrocobalt(III) and leads to optically active complexes with spectra similar to those of the corresponding tris oxalate. 

A biomolecule aided solvothermal synthesis procedure was used to obtain cobalt sulfide hollow spheres.In a typical method L-cysteine, anhydrous cobalt chloride and different surfactants were dissolved in ethylenediamine. Cysteine was incorporated as a sulfur souree and also to facilitate the microsphere formation. The reaetion mixture was autoclaved at 180 °C for different times after stirring for 15 minutes. The resulting products were washed with deionised water and ethanol several times and placed in a vacuum oven at 60 °C for 4 hours. The hollow... 

---