Question

Write the IUPAC name of the following coordination compounds:
(i)$\left[\text{Cr}{\left(\text{N}{\text{H}}_3\right)}_3\text{C}{\text{l}}_3\right]$
(ii) ${\text{K}}_3\left[\text{Fe}{\left(\text{CN}\right)}_6\right]$
(iii) ${\left[\text{CoB}{\text{r}}_2{\left(\text{en}\right)}_2\right]}^{+}$

Answer 1

Hint: The name of compounds is written by using the IUPAC rules of the naming of coordination compounds. Write the name of the cation part then the name of the anion part. Write the name of the ligand in alphabetical order.

Complete step by step answer:
For neutral ligand, the name of the compound is used as such but for water use ‘aqua’ for ammonia use ‘ammine’
For anionic ligands replace the,
Ide with o.
Ate with ato.
Ite with ito.
Use Greek prefix to denote the number of the ligand. If the name of the ligand has a Greek prefix then use bis for two, tris for three.
Write the name of the metal.
For the cationic complex, write the metal name as such.
For anionic complexes, use the suffix ‘ate’.
(i) The name of the compound $\left[\text{Cr}{\left(\text{N}{\text{H}}_3\right)}_3\text{C}{\text{l}}_3\right]$ is as follows:
The ligands are chloro and ammine. The oxidation state of the metal is zero.
Triamminetrichlorochromium (0)
(ii) The name of the compound ${\text{K}}_3\left[\text{Fe}{\left(\text{CN}\right)}_6\right]$ is as follows:
Potassium hexacyanoferrate (III)
The ligands are cyno. The oxidation state of the metal is + 3.
(iii)
The name of the compound ${\left[\text{CoB}{\text{r}}_2{\left(\text{en}\right)}_2\right]}^{+}$ is as follows:
The ligands are bromo and ethylenediamine. The oxidation state of the metal is + 3.
Dibromobis-(ethane-1,2-diamine)cobalt(III)

Note: The name of ${\text{K}}_3\left[\text{Fe}{\left(\text{CN}\right)}_6\right]$ is potassium hexacyanoferrate. The name of cation and anion has a gap. The number of potassium ions is not shown. Only the name is shown because the potassium is a counter ion which is used to stabilize the charge of the complex so, the number of potassium ions is not shown.