Bis[tris(2-aminoethyl)amine]cobalt(II) Bis[tetracarbonylcobaltate(1–)]

The title compound, [Co(C₆H₁₈N₄)₂][Co(CO)₄]₂, comprises [Co(N₄H₁₈C₆)₂]²⁺ and [Co(CO)₄]⁻ ions. The cation presents a distorted-octahedral arrangement of N atoms around the Co^II atom, while in the anion, four CO ligands are coordinated to the Co^-I atom in an approximately tetrahedral distribution. The anions and cations are linked in the crystal structure via hydrogen bonds of the type Co^II—X—H...OC—Co^-I (X = N or C), in which both donor and acceptor groups are influenced by the coordination to a metal center.

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