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Bonding in Co-Ordination chemistry

How is it possible that [Co(h20)6]3+ will oxidize water but [Co(Nh36]3+ is stable in aqueous solution?

Both are mondentate ligands. I thought the proximity of the nitrogens after one has bonded to the cobalt would make it more likely to react, because the entropy would be lowered. They are also both low spin complexes.

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This is related to the coordination strength of the ligands.

Fisrt of all, the d orbitals of Cobalt split into two groups under the octahedral coordination environment. There are two degenerate orbitals in the higher-energer group, and three degenerate orbitals in the lower-energer group.

When the ...

Solution Summary

The solution breaks down the relevant theory to clearly explain what it is that lets [Co(Nh36]3+ be stable in aqueous solution when [Co(h20)6]3+ will oxidize water.