The name is tris(ethane-1,2–diamine)cobalt(III) sulphate. The oxidation state of cobalt is deduced from the charge on the complex cation, which is +3, as three sulphates are needed to balance two complex cations.
Provide the name for the coordination compound [Co(H₂NCH₂CH₂NH₂)₃]₂(SO₄)₃ and explain how the oxidation state of cobalt is determined.
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The coordination compound [Co(H₂NCH₂CH₂NH₂)₃]₂(SO₄)₃ is named as tris(ethane-1,2-diamine)cobalt(III) sulfate. In the name, “tris” denotes three ethane-1,2-diamine ligands, “cobalt(III)” indicates the oxidation state of cobalt, and “sulfate” represents the counter anion. The oxidation state of cobalt is determined by considering the overall charge on the complex. Since there are three sulfate ions (SO₄²⁻) with a total charge of -6, each cobalt must have a +3 oxidation state to balance the charge, indicating the oxidation number of the central metal in the complex.