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CBSE Class 12-science Answered

Explain classification of ligands on the basis of charge and dentisity. Explain the ambidentate ligands following terms with example.

Bidentate ligand

Tridentate ligands

Tetradentate ligands

Pentadentate ligands

Hexadentate ligands

 

Asked by smit230503 | 04 Feb, 2020, 08:56: PM
Expert Answer
  • Denticity: The number of ligating (linking) atoms present in a ligand is called denticity.
  • Unidentate ligands: The ligands whose only donor atom is bonded to a metal atom are called unidentate ligands. 
  • Examples: H2O, NH3, CO, CN
  • Didentate ligands: The ligands which contain two donor atoms or ions through which they are bonded to the metal ion. 
  • Example: Ethylene diamine (H2NCH2CH2NH2) has two nitrogen atoms, and oxalate ion  has two oxygen atoms which can bind with the metal atom.
                oxalate ion
  • Polydentate ligand: When several donor atoms are present in a single ligand, the ligand is called a polydentate ligand. 
  • Example: In N(CH2CH2NH2)3, the ligand is said to be polydentate. Ethylenediaminetetraacetate ion  (EDTA4–) is an important hexadentate ligand. It can bind through two nitrogen and four oxygen atoms to a central metal ion.
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