The IUPAC name of NiCl₄²⁻ is tetrachloronickelate(II) ion.
IUPAC Nomenclature for Complex Ions:
Naming Components:
1. Ligand:
- Chloro- (for Cl⁻ ligands)
- "Tetra-" prefix (4 chloride ligands)
- Result: tetrachloro-
2. Metal:
- Nickel (central metal)
- "-ate" suffix (indicates anionic complex)
- Result: nickelate
3. Oxidation State:
- Ni oxidation state: +2
- Indicated in Roman numerals in parentheses
- Result: (II)
Complete Name:Tetrachloronickelate(II) ion
Alternative Representation:
- [NiCl₄]²⁻
- Square planar geometry
- Coordination number: 4
Oxidation State Calculation:
- Let Ni oxidation state = x
- 4(Cl⁻) + Ni = -2 (overall charge)
- x + 4(-1) = -2
- x = +2
Key Takeaways:
- IUPAC name: tetrachloronickelate(II)
- Formula: [NiCl₄]²⁻
- Oxidation state of Ni: +2
- Anionic complex (hence "-ate" suffix)