. What is meant by the chelate effect Give an example
- The complex formed by a polydentate ligand with a metal ion is more stable than the complex formed by the same metal and with the monodentate ligands. The greater stability of polydentate ligands is called the chelate effect.
- The greater stability of the polydentate complex is due to the entropy factor because a polydentate can replace many mono-dentate ligands and entropy of reaction increases.
- Example- [Fe (EDATA) ]- (Ethylenediaminetetraacetatoferrate(III) ion) is more stable than a mono dentate [Fe(H2O)6 ]2+ ,Hexaaquairon (II) complex
A polydentate ligand is more stable than the monodentate ligand with the same metal ion and this is called chelate effect