Ligand
| Formula / Notation | L: → M; monodentate (1 donor), bidentate (2 donors), chelate (polydentate) |
|---|---|
| Also Known As | Lewis base (in coordination context), donor molecule, coordinating ligand, chelating agent |
What is Ligand?
An ion or molecule that donates a pair of electrons to a central metal atom or ion to form a coordination complex. Monodentate ligands have one donor atom; polydentate (chelate) ligands have multiple. Common ligands include water, ammonia, CN⁻, and EDTA.
Formula & Notation
Other Names / Synonyms: Lewis base (in coordination context), donor molecule, coordinating ligand, chelating agent
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
An ion or molecule that donates a pair of electrons to a central metal atom or ion to form a coordination complex. Monodentate ligands have one donor atom; polydentate (chelate) ligands have multiple. Common ligands include water, ammonia, CN⁻, and EDTA.
Ligands are central to coordination chemistry: EDTA (analytical reagent, chelation therapy), CO (in metal carbonyl catalysts: Fe(CO)₅, Rh(CO)(PPh₃)₂Cl), phosphines (in homogeneous catalysts: Wilkinson's), biological ligands (porphyrin in haemoglobin, corrin in vitamin B₁₂), and pharmaceutical ligand…
Many ligands are toxic or reactive. CO is acutely toxic (see carbon monoxide). Cyanide ligands release HCN on acidification. Phosphine ligands are toxic and flammable. Understanding ligand exchange lability is key to predicting whether protective complexes in chelation therapy will remain intact in …
The formula or notation for Ligand is: L: → M; monodentate (1 donor), bidentate (2 donors), chelate (polydentate)