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Cyclic Voltammetry question

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Hey guys,

So I did an experiment on reversible and irreversible reactions via cyclic Voltammetry. And my results show that Co3+ as Co(diNOsar)]Br3 is a reversible process (Co3+ can be reduced to Co2+ AND oxidised back) and [Co(en)3]I3 is irreversible (Co3+ can be reduced to Co2+ but not oxidised back) (both in pH 1 electrolyte solution). And im not quite sure why? I know it has something to do with lability of the ligands and maybe crystal field splitting. But for the most part Im lost.

Thank you in advance

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