Number of ambidentate ligands in given complex [M(en)(SCN)4]:
Correct Answer: 4
Solution and Explanation
Key Concept:
An ambidentate ligand is a ligand that can coordinate to the central metal atom/ion through two different atoms (donor sites) but only one at a time.
Example: SCN⁻ (Thiocyanate Ion)
- The thiocyanate ion (\( \text{SCN}^- \)) is an ambidentate ligand.
- It can bind to the central atom through:
- Sulfur (S): as a donor atom (soft base).
- Nitrogen (N): as a donor atom (hard base).
Conclusion:
The correct answer is 4, as SCN⁻ is an ambidentate ligand with two donor sites (S and N).
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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.