Question

Write the IUPAC names of the following coordination compound: \([Co(NH_3)_6]Cl_3\)

Hint:

When naming coordination compounds, always use the prefix to describe the number of identical ligands and the oxidation state of the metal.

Answer 1

Step 1: Identify the ligands. The ligand in this compound is ammonia \((NH_3)\), which is a neutral ligand.

Step 2: Identify the oxidation state of the metal. Cobalt (Co) in this compound is in the +3 oxidation state, because the three chloride ions \((Cl^-)\) each carry a -1 charge, and the six ammonia molecules are neutral. Thus, the total charge on the complex is +3.

Step 3: Write the IUPAC name. The IUPAC name is: Hexaamminecobalt(III) chloride.