What is the IUPAC name of the compound with the formula [Co(NH3)5Cl]Cl2?

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Question: What is the IUPAC name of the compound with the formula [Co(NH3)5Cl]Cl2?

Options:

Correct Answer: Pentaamminechlorocobalt(III) chloride

Solution:

The complex has a cobalt ion in the +3 oxidation state, and the correct IUPAC name is Pentaamminechlorocobalt(III) chloride.

What is the IUPAC name of the compound with the formula [Co(NH3)5Cl]Cl2?

What is the IUPAC name of the compound with the formula [Co(NH3)5Cl]Cl2?

Step 1: Identify the central metal ion in the compound. In this case, it is cobalt (Co).
Step 2: Determine the oxidation state of the cobalt ion. The complex has 5 ammonia (NH3) ligands and 1 chloride (Cl) ligand. Since the overall charge of the complex is neutral and the 2 chloride ions outside the brackets contribute -2 charge, cobalt must be in the +3 oxidation state to balance it.
Step 3: Name the ligands in the complex. The ammonia (NH3) is called 'ammine' and there are 5 of them, so we use 'pentaammine'. The chloride (Cl) ligand is simply called 'chlorido'.
Step 4: Combine the names of the ligands with the name of the metal. Since cobalt is in the +3 oxidation state, we write it as 'cobalt(III)'.
Step 5: Put it all together. The full name of the compound is 'Pentaamminechlorocobalt(III) chloride'.

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