Which of the following cannot be explained by crystal field theory?
Show Hint
CFT cannot explain the order of the spectrochemical series but can predict properties like magnetism, colour, and stability of metal complexes.
- Magnetic properties of transition metal complexes
- The order of spectrochemical series
- Colour of metal complexes
- Stability of metal complexes
The Correct Option is B
Solution and Explanation
Crystal Field Theory (CFT) explains several properties of transition metal complexes:
• Magnetic properties: CFT predicts the magnetic properties of complexes based on the number of unpaired electrons and the strength of the ligand field.
• Colour of complexes: CFT explains the colour of complexes through the splitting of d-orbitals into t\(t_{2g}\) and \(e_{g}\) levels, causing electronic transitions.
• Stability of complexes: The thermodynamic stability of complexes is influenced by Crystal Field Stabilization Energy (CFSE), which depends on the splitting of d-orbitals.
However, CFT does not explain the order of the spectrochemical series, as this order is based on experimental data and involves factors such as covalent bonding, which are outside the scope of CFT.
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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.