Studies on the Synthesis of Metal Complexes. III. Synthesis of Ethylenediamine-carbonato, Ammine-oxalato and Ethylenediamineoxalato Series of Cobalt (III) Complexes

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Three series of cobalt(III) complexes were systematically synthesized from the green solution of potassium tricarbonatocobaltate(III) by means of successive substitution of carbonate by other groups: i) Blue-K[Co en(CO3)2]·H2O, Violet-K[Co en(CO3)2]·H2O, [Co en2CO3]Cl·H2O, [Co en3]Cl3·3H2O ii) Blue-K[Co(NH3)2(C2O4)2]·H2O, Violet-K[Co(NH3)2(C2O4)2]·H2O, [Co(NH3)4C2O4]Cl, K3[Co(C2O4)3]·3H2O iii) Blue-K [Co en(C2O4)2]·H2O, Violet-K[Co en(C2O4)2]·H2O, [Co en2(C2O4)]Cl·H2O. Of these, the blue and the violet varieties are probably to be regarded as new complexes, stereoisomeric with each other.