Question

Name the following coordination compounds. a. ${\mathrm{Na}}_4\left[\mathrm{Ni}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]$ b. ${\mathrm{K}}_2\left[{\mathrm{CoCl}}_4\right]$ c. $\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{SO}}_4$ d. $[\mathrm{Co}(\mathrm{en}{)}_2(\mathrm{SCN})\mathrm{Cl}]\mathrm{Cl}$

Short answer

The short answer for the given coordination compounds is: a. Tetrasodium trioxalatonickel(II) b. Dipotassium tetrachloridocobalt(II) c. Tetraamminecopper(II) sulfate d. Diethylenediamine thiocyanato chloridocobalt(III) chloride

Step-by-step solution

Identify the central metal atom/ion and ligands

In this compound, Ni is the central metal ion and three oxalate ligands (${\mathrm{C}}_2{\mathrm{O}}_4^{-2}$) are surrounding it. There are 4 sodium ions (${\mathrm{Na}}^{+}$) as counterions.

Name the compound following IUPAC conventions

The name of the compound should follow the order: cation - anion - ligand - metal - oxidation state. We have: 1. Cation: tetrasodium 2. Ligand: trioxalato (since there are three oxalate ligands) 3. Metal: nickel 4. Oxidation state: (3 x (-2)) + (4 x 1) = 0; hence, oxidation state = 2. The full name is: Tetrasodium trioxalatonickel(II) #(b) ${\mathrm{K}}_2\left[{\mathrm{CoCl}}_4\right]$:#

Identify the central metal atom/ion and ligands

In this compound, Co is the central metal ion and there are 4 chloride ions (${\mathrm{Cl}}^{-}$) surrounding it. There are 2 potassium ions (${\mathrm{K}}^{+}$) as counterions.

Name the compound following IUPAC conventions

The name of the compound should follow the order: cation - anion - ligand - metal - oxidation state. We have: 1. Cation: dipotassium 2. Ligand: tetrachlorido (since there are 4 chloride ligands) 3. Metal: cobalt 4. Oxidation state: (4 x (-1)) + (2 x 1) = 0; hence, oxidation state = 2. The full name is: Dipotassium tetrachloridocobalt(II) #(c) $\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{SO}}_4$:#

Identify the central metal atom/ion and ligands

In this compound, Cu is the central metal ion and there are 4 ammonia ligands (${\mathrm{NH}}_3$) surrounding it. The counterion is sulfate (${\mathrm{SO}}_4^{-2}$).

Name the compound following IUPAC conventions

The name of the compound should follow the order: cation - anion - ligand - metal - oxidation state. We have: 1. Cation: tetraammine (since there are 4 ammonia ligands) 2. Anion: sulfate 3. Metal: copper 4. Oxidation state: 0; hence, oxidation state = 2. The full name is: Tetraamminecopper(II) sulfate #(d) $[\mathrm{Co}(\mathrm{en}{)}_2(\mathrm{SCN})\mathrm{Cl}]\mathrm{Cl}$:#

Identify the central metal atom/ion and ligands

In this compound, Co is the central metal ion, and its ligands are 2 ethylenediamine ligands (en), one thiocyanate ligand (${\mathrm{SCN}}^{-}$), and one chloride ion (${\mathrm{Cl}}^{-}$). The counterion is one chloride ion.

Name the compound following IUPAC conventions

The name of the compound should follow the order: cation - anion - ligand - metal - oxidation state. We have: 1. Cation: diethylenediamine (since there are 2 en ligands), thiochanato (follow alphabetical order) 2. Anion: chlorido 3. Metal: cobalt 4. Oxidation state: (1 x (-1)) + (1 x 1) = 0; hence, oxidation state = 3. The full name is: Diethylenediamine thiocyanato chloridocobalt(III) chloride