Problem 26 - Chemistry: The Central Science

Question

Write names for the following coordination compounds: (a) \(\left[\mathrm{Cd}(\mathrm{en}) \mathrm{Cl}_{2}\right]\) (b) \(\mathrm{K}_{4}\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]\) (c) \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{CO}_{3}\right] \mathrm{Cl}\) (d) \(\left[\operatorname{Ir}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]\left(\mathrm{NO}_{3}\right)_{3}\)

Step-by-Step Solution

Answer

(a) Ethylenediamine dichloride cadmium (b) Potassium hexacyanomanganese(II) (c) Pentaamminecarbonatochromium(III) chloride (d) Tetraamminediaquadirconium(III) nitrate

Step 1: Identify Ligands and Metal Ion

In this compound, we have \(\text{Cd}\) as the metal ion, \(\text{en}\) (ethylenediamine) as one ligand, and \(\text{Cl}\) (chloride) as the other ligand.

Step 2: Write the Names in Alphabetical Order

Next, we write the ligand names in alphabetical order followed by the name of the metal ion: ethylenediamine dichloride cadmium.

Step 3: Final Name

The name for this coordination compound is Ethylenediamine dichloride cadmium. (b) \(\text{K}_{4}\left[\text{Mn}(\text{CN})_{6}\right]\)

Step 1: Identify Ligands and Metal Ion

In this compound, we have \(\text{Mn}\) as the metal ion and \(\text{CN}\) (cyanide) as the ligand. Potassium (\(\text{K}\)) is the counter-ion.

Step 2: Write the Names in Alphabetical Order

Next, we write the ligand names in alphabetical order followed by the name of the metal ion: hexacyanomanganese(II).

Step 3: Write the Name of Counter-ion

We also need to write the name of the counter-ion: potassium.

Step 7: Final Name

The name for this coordination compound is Potassium hexacyanomanganese(II). (c) \(\left[\text{Cr}\left(\text{NH}_{3}\right)_{5} \text{CO}_{3}\right]\text{Cl}\)

Step 1: Identify Ligands and Metal Ion

In this compound, we have \(\text{Cr}\) as the metal ion, \(\text{NH}_{3}\) (ammine, not ammonia as a ligand) as one ligand, and \(\text{CO}_{3}\) (carbonato) as the other ligand. Chloride (\(\text{Cl}\)) is the counter-ion.

Step 2: Write the Names in Alphabetical Order

Next, we write the ligand names in alphabetical order followed by the name of the metal ion: pentaamminecarbonatochromium(III).

Step 3: Write the Name of Counter-ion

We also need to write the name of the counter-ion: chloride.

Step 11: Final Name

The name for this coordination compound is Pentaamminecarbonatochromium(III) chloride. (d) \(\left[\operatorname{Ir}\left(\text{NH}_{3}\right)_{4}\left(\text{H}_{2}\text{O}\right)_{2}\right]\left(\text{NO}_{3}\right)_{3}\)

Step 1: Identify Ligands and Metal Ion

In this compound, we have \(\text{Ir}\) as the metal ion, \(\text{NH}_{3}\) (%Amine%) as one ligand, and \(\text{H}_{2}\text{O}\) (aqua) as the other ligand. Nitrate ( \(\text{NO}_{3}\)) is the counter-ion.

Step 2: Write the Names in Alphabetical Order

Next, we write the ligand names in alphabetical order, followed by the name of the metal ion: tetraamminediaquadirconium(III).

Step 3: Write the Name of Counter-ion

We also need to write the name of the counter-ion: nitrate.

Step 15: Final Name

The name for this coordination compound is: Tetraamminediaquadirconium(III) nitrate.