Q55 P - Chemistry: Molecular Nature Of Matter And Change

Question

Give the systematic names for the following formulas

1. $\mathbf{\left[}\mathbf{Ni}\left(H_2{O}_6\right)\mathbf{\right]}{\mathbf{Cl}}_{\mathbf{2}}$
2. $\mathbf{\left[}\mathbf{Cr}{\mathbf{\left(}\mathbf{en}\mathbf{\right)}}_{\mathbf{3}}\mathbf{\right]}{\mathbf{\left(}\mathbf{C}\mathbf{l}{\mathbf{O}}_{\mathbf{4}}\mathbf{\right)}}_{\mathbf{3}}$
   
3. ${\mathit{K}}_{\mathbf{4}}\mathbf{\left[}\mathbf{M}\mathbf{n}{\left(CN\right)}_{\mathbf{6}}\mathbf{\right]}$
   

Step-by-Step Solution

Answer

1. The systematic name of $\left[\mathrm{Ni}\left({\mathrm{H}}_2{\mathrm{O}}_6\right)\right]{\mathrm{Cl}}_2$ is hexa aquanickel(II)chloride
2. The systematic name of $\left[\mathrm{Cr}{\left(\mathrm{en}\right)}_3\right]{\left({\mathrm{ClO}}_4\right)}_3$ is tris(ethylenediamine)chromium (III)perchlorate
3. The systematic name of $K_4\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6\right]$ is potassium hexacyanomanganate (II).

Step 1: Rules to name coordination compound

• Cation is named before anion.   
• In the complex ion, name ligands before metal ion in alphabetical order.
• A numerical prefix is the number of ligands of particular type.
• The oxidation state of metal ion is written by the numerals in parentheses if the metal ion has more than one oxidation state.
• If the complex ion is an anion, we add -ate instead of the ending of metal name.
• Neutral ligands most often have molecule name, but anionic ligands lose the -ide and add -o after the root name.

Step 2: Systematic name of the coordination compound

The names of given coordination compounds is

 

1. $\left[\mathrm{Ni}\left({\mathrm{H}}_2{\mathrm{O}}_6\right)\right]{\mathrm{Cl}}_2$ - hexaaquanickel (II)chloride
2. $\left[\mathrm{Cr}{\left(\mathrm{en}\right)}_3\right]{\left({\mathrm{ClO}}_4\right)}_3$ - tris(ethylenediamine)chromium (III)perchlorate
3. $K_4\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6\right]$ - potassium hexacyanomanganate (II)