Oxalato ethylenediamine cobalt

Procedure 5.1.c D,L-Sodium bis(oxalato)ethylenediamine Cobaltate(lll) Monohydrate Na2[Co(ox)2(en)] H207... 

Hexamminecobalt(III) salt cannot be used as a precipitant in the oxalato complex precipitation system because it precipitates as hexamminecobalt(III) oxalate. Besides the hexaureachro-mium(III) salt, hexamminechromium(III), tris(ethylenediamine)cobalt (III) or tris(trimethylenediamine)cobalt(III) salts can be used as precipitants. Hexamminechromium(III) and tris(ethylenediamine) cobalt (III) salts form precipitates with actinide(IV) or (VI) oxalato complex ions, whereas tris(trimethylenediamine)co-balt(III) salt forms precipitates with Th(IV) or U(VI) oxalato complex ions leaving Pu(IV) ion in the supernatant solution.Therefore, this reagent plays the role of both a separating agent and a precipitant and is applicable for the separation of Pu(IV) ion from Th(IV) or U(VI) ion. 

C12H28CO2N8O12, (-)-Dinitrobis(ethylenediamine)cobalt(III) (+)-bis-(malonato)ethylenediaminecobaltate(lll), 38B, 821 C12H2eCr2N6O14, Oxalatobis(ethylenediamine)chromium(III) bis-(oxalato)ethylenediaminechromate(III) dihydrate, 35B, 604 Cl2H28CUN4O6, Bis(N-(2-hydroxyethyl)ethylenediamine)copper(II) succinate, 44B, 807... 

The optical antipodes have been obtained recently by resolution using the (+)D-(ethylenediamine)bis(oxalato)cobalt(III) anion, and have been isolated as the iodide salt.2 The exchange reaction with carbonate and the racemization reaction in aqueous solution have been investigated kinetically.3... 

Because the optically active forms of the (ethylenediamine)bis-(oxalato)cobaltate(III) ion have been, and will continue to be, excellent resolving agents for many cationic cobalt(III) complexes, it is only proper that a detailed resolution procedure be developed to produce both enantiomorphic forms in useful quantities. 

Racemic sodium and calcium (ethylenediamine)bis(oxalato)-cobaltate(III) are prepared by the method given by Dwyer, Reid, and Garvan.1... 

Procedure 5.1.b Bis(ethylenediamine)(oxalato)cobalt(lll) Chloride Monohydrate, [Co(en)2(ox)]CI H206... 

Cl 1H2 C1CoNi,08 f (-)-/3-Oxalato( (4R,6R)-dimethyl-3,7-diazanonane-1,9-diamine)cobalt(III) perchlorate, 44B, 806 CliH2 CrNiiNi 1.5 H2O, Tris(ethylenediamine)chromium(III) pentacy-anonickelate(lI) sesquihydrate, 33B, 386 ... 

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