The IUPAC name of ` [Ni(NH_3)_4][NiCl_4] ` is

Options

A. Tetrachloridonickel (II) tetraamminenickel (II)
B. tetraamminenickel (II) Tetrachloridonickel (II)
C. tetraamminenickel (II) Tetrachloridonickelate (II)
D. tetraamminenickel (Iv) Tetrachloridonickelate (Iv)

Answer

To determine the IUPAC name of the coordination compound \([Ni(NH_3)_4][NiCl_4]\), we can follow these steps:

### Step 1: Identify the Coordination Complexes
The compound consists of two parts:
1. The cationic complex: \([Ni(NH_3)_4]^{2+}\)
2. The anionic complex: \([NiCl_4]^{2-}\)

### Step 2: Determine the Oxidation States
- In the cationic complex \([Ni(NH_3)_4]^{2+}\):
- Nickel (Ni) is in the +2 oxidation state.
- Ammonia (NH₃) is a neutral ligand, contributing 0 to the charge.

- In the anionic complex \([NiCl_4]^{2-}\):
- Nickel (Ni) is also in the +2 oxidation state.
- Each chloride ion (Cl) has a -1 charge, and with 4 chloride ions, the total charge is -4. Thus, the overall charge of the complex is -2.

### Step 3: Naming the Cation
- The cation \([Ni(NH_3)_4]^{2+}\) contains 4 ammonia ligands.
- In IUPAC nomenclature, "ammonia" is referred to as "ammine".
- Therefore, we name the cation as "tetraammine nickel(II)".

### Step 4: Naming the Anion
- The anion \([NiCl_4]^{2-}\) contains 4 chloride ions.
- In IUPAC nomenclature, "chloride" is used for the chloride ions.
- The anion is named "tetrachloronickelate(II)" because it carries a -2 charge.

### Step 5: Combine the Names
- The full IUPAC name of the compound is obtained by combining the names of the cation and anion:
- Cation: "tetraammine nickel(II)"
- Anion: "tetrachloronickelate(II)"

### Final IUPAC Name
Thus, the IUPAC name of the compound \([Ni(NH_3)_4][NiCl_4]\) is:
**Tetraammine nickel(II) tetrachloronickelate(II)**.