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Quick Reference
Also Known As
LFT, ligand field theory, molecular orbital theory (coordination chemistry context)
What is Ligand Field Theory?
A more complete version of crystal field theory that considers the covalent character of metal-ligand bonds. It uses molecular orbital theory to explain the electronic structure of coordination compounds, including their spectral and magnetic properties.
Properties & Characteristics
Ligand Field Theory (LFT) is a more advanced description of metal-ligand bonding in coordination compounds that combines crystal field theory (electrostatic splitting of d orbitals) with molecular orbital theory (covalent bonding via σ and π interaction of metal and ligand orbitals). LFT accounts for π-donor (halogeno, oxo ligands lower in spectrochemical series) and π-acceptor (CO, CN⁻, phosphines, higher in series) effects that CFT cannot explain.
Uses & Applications
LFT explains: why CO and CN⁻ are strong field ligands (π-backbonding from metal to ligand vacant π* orbitals), why metal carbonyls have low oxidation state metals (π-acceptor stabilisation of low-valent metals), magnetic properties, colour, and reactivity of coordination compounds. It is used in the design of homogeneous catalysts.
Safety Information
No direct safety concern for the theory. Ligand field concepts help predict complex stability and potential ligand release — important for understanding whether toxic ligands (CO, CN⁻) will dissociate from metal complexes under physiological conditions.
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
SynonymsLFT, ligand field theory, molecular orbital theory (coordination chemistry context)
Frequently Asked Questions
A more complete version of crystal field theory that considers the covalent character of metal-ligand bonds. It uses molecular orbital theory to explain the electronic structure of coordination compounds, including their spectral and magnetic properties.
LFT explains: why CO and CN⁻ are strong field ligands (π-backbonding from metal to ligand vacant π* orbitals), why metal carbonyls have low oxidation state metals (π-acceptor stabilisation of low-valent metals), magnetic properties, colour, and reactivity of coordination compounds. It is used in the…
No direct safety concern for the theory. Ligand field concepts help predict complex stability and potential ligand release — important for understanding whether toxic ligands (CO, CN⁻) will dissociate from metal complexes under physiological conditions.
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.
