What is the coordination number of the metal atom in the [Co(CN)(NH3)(en)2]3+ Complex?

Question

What is the coordination number of the metal atom in the [Co(CN)(NH₃)(en)₂]³⁺ Complex?

Answer 1

[Co(CN)(NH₃)(en)₂]³⁺ (one of three possible isomers)

en = H₂NCH₂CH₂NH₂ is a bidentate ligand occupying two coordination sites.

Cobalt's coordination number is 6.

Co⁴⁺ (since the CN is negatively charged) is an unusual oxidation state for cobalt. I wonder if the formula of the coordination complex should actually be [Co(CN)(NH₃)(en)₂]²⁺.