Tris­(ethyl­enedi­amine‐N,N′)cobalt(III) oxalate perchlorate dihydrate

The crystallization behavior of the title compound, [Co(C₂H₈N₂)₃](C₂O₄)(ClO₄)·2H₂O, has been studied in order to evaluate the effect of the counter‐anion on the crystalline structures of [Co(en)₃](C₂O₄)·X (en = ethyl­enedi­amine). Two‐dimensional intermolecular hydrogen‐bonding networks are formed between the amine protons of the [Co(en)₃]³⁺ cations and the O atoms of the oxalate anions. Perchlorate and water mol­ecules fill in the channels between the two‐dimensional networks and form hydrogen‐bonding interactions with the two‐dimensional layers, thus constructing a three‐dimensional hydrogen‐bonding network.