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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  
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Asked by smit230503 | 04 Feb, 2020, 08:56: PM
answered-by-expert 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.
Answered by Ramandeep | 05 Feb, 2020, 10:54: AM

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