Question

The IUPAC name for [CoCl(NO₂)(en)₂]Cl is ____________.

पर्याय

• Chloridonitrobis (ethylenediamine) cobalt (II) chloride

• Chlorodobis (ethane-1, 2-diamine) nitrito–N–cobalt (III) chloride

• Chloridonitrobis (ethylenediamine) cobalt (III) chloride

• Bis (ethylenediamine) chloronitrocobalt (III) chloride

Answer 1

The IUPAC name for [CoCl(NO₂)(en)₂]Cl is Chlorodobis (ethane-1, 2-diamine) nitrito–N–cobalt (III) chloride.

Explanation:

In the nomenclature of coordination compounds, the ligands are named in alphabetical order followed by the central metal atom/ion with its oxidation number in roman numeral in parenthesis.

The cation is named first and then the anion. Here the complex is a cation. And we can see that the ligands present are Cl⁻ (chlorido), en (ethane-1, 2-diamine), and \[\ce{NO^-_2}\] (nitrito-N).

The central metal is Cobalt. The anion present is chloride and carries a −1 charge. So the overall charge on the complex cation is +1.

Nitrito-N carries −1 charge and chlorido carries −1 charge. en is a neutral ligand.

Let's assume the oxidation number for Co to be x. Then

x + (−1) + (−1) = +1

x − 2 = +1

x = +1 + 2 = +3

So the oxidation state of Co is +3.

Hence the IUPAC name for the given complex is Chloridobis (ethane-1, 2-diamine) nitrito-N-cobalt (III) chloride.