Question

Give the systematic name for each of the following chemicalcompounds:

$\begin{array}{l}\mathbf{a}\mathbf{)}\mathbf{\left[}\mathbf{Ni}{\mathbf{\left(}{\mathbf{OH}}_2\mathbf{\right)}}_4{\mathbf{\left(}\mathbf{OH}\mathbf{\right)}}_2\mathbf{\right]}\\ \mathbf{b}\mathbf{)}\mathbf{\left[}\mathbf{HgClI}\mathbf{\right]}\\ \mathbf{c}\mathbf{)}{\mathbf{K}}_4\mathbf{\left[}\mathbf{Os}{\mathbf{\left(}\mathbf{CN}\mathbf{\right)}}_5\mathbf{\right]}\\ \mathbf{d}\mathbf{)}\mathbf{\left[}\mathbf{FeBrCl}{\mathbf{\left(}\mathbf{en}\mathbf{\right)}}_2\mathbf{\right]}\mathbf{Cl}\end{array}$

Short answer

1. Tetra-aquadihydroxonickel(II).
2. Chloriodomercury(II)
3. Potassium pentacyanosmate(I)
4. Bromochlorobis(ethylenediamine)iron(I) chloride

Step-by-step solution

Naming coordination compound

Coordinate compounds are named according to IUPAC nomenclature

• Inside the square bracket complex compound
• Outside, the square bracket has cation on the left and anion on the right

The naming of the cation and anion part in the coordination compound is done differently.

Name of coordination complex (a)

The coordination compound (a) coordination sphere has two ligands, which are named alphabetically, first named aqua (Tetra-aqua) and then named hydroxo (dihydroxo). The central metal is named nickel which is in +2 oxidation state written in roman; thus, the name of the coordination complex becomes:

$\left[\text{Ni}{\left({\text{OH}}_{\text{2}}\right)}_{\text{4}}{\left(\text{OH}\right)}_{\text{2}}\right]\to$Tetra-aquadihydroxonickel(II)

Name of coordination complex (b)

The given coordination compound (b) coordination sphere has two ligands named alphabetically: first, chloro, then iodo. The central metal is named mercury which is in +2 oxidation state written in roman; thus, the name of the coordination complex became:

$\left[\text{HgClI}\right]\to$Chloriodomercury(II)

Name of coordination complex (c)

The given coordination compound (c) has cation potassium which is named first, and the coordination sphere has cyano ligand coordinated to central metal osmate having a +1 oxidation state written in roman; thus, the name of the coordination complex becomes:

${\text{K}}_{\text{4}}\left[\text{Os}{\left(\text{CN}\right)}_{\text{5}}\right]\to$Potassium pentacyanosmate(I)

Name of coordination complex (d)

The given coordination compound (d) coordination sphere has three ligands named alphabetically: bromo, chloro, andethylenediamine (bis ethylenediamine). The central metal's name is iron, having +1 oxidation state written in roman and onechloride counter anion is written in last thus, the name of coordination complex becomes:

$\left[\text{FeBrCl}{\left(\text{en}\right)}_{\text{2}}\right]\text{Cl}\to$Bromochlorobis(ethylenediamine)iron(I) chloride