Isomers
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Co(NH3)4Cl3 is a better choice than Co(NH3)2(NO2)2Cl. The second compound contains NO2 groups, which can form structural isomers in both Werner's and Jørgensen's structures.

Two isomers of Co(NH3)4Cl3 should exist according to Werner's theory. Jørgensen's theory only allows for one.

Praseo: Violeo:
Only the praseo isomer has been prepared. The violeo has not.