Question:
The structure of paramagnetic nickel complex, $ [NiCl_4]^{2-} $ is
The structure of paramagnetic nickel complex, $ [NiCl_4]^{2-} $ is
Updated On: Apr 4, 2023
- tetrahedral
- square planar
- trigonal bipyramidal
- distorted octahedral
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The Correct Option is A
Approach Solution - 1
In $[Ni(Cl)_4]^{2-}$ complex ion, $Ni$ is in $+2$ oxidation state. It has electronic configuration $3d^8$. It is paramagnetic and $sp^3$ hybridised so the four hybridised equivalent orbitals oriented tetrahedrally
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Approach Solution -2
In Ni(CO)4, the oxidation state of Ni is zero, whereas in [NiCl4 ]2−, the oxidation state of Ni is +2.
The presence of the CO ligand, which is a strong ligand, can pair all electrons in Ni(CO)4 and thus it is diamagnetic but Cl− is a weak ligand and is unable to pair up the unpaired electrons and thus [NiCl4]2− is paramagnetic.
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.