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What is the IUPAC name of the coordination compound [Co(NO2)(NH3)5]Cl2?

1. pentaammine nitrito-N-cobalt(II) chloride
2. pentaammine nitro-N-cobalt(II) chloride
3. nitrito-N-pentaamminecobalt(III) chloride
4. nitrito-N-pentaamminecobalt(II) chloride

Correct answer: nitrito-N-pentaamminecobalt(III) chloride

Solution

In [Co(NO2)(NH3)5]Cl2 the complex ion is +2 (balances 2 Cl-); with NO2 as -1 and NH3 neutral, Co is +3. Bound through N it is the nitrito-N (nitro) ligand, giving pentaamminenitrito-N-cobalt(III) chloride. Only the cobalt(III) option is consistent with the oxidation state.

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