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Grade: 12
        
Difference between didentate & ambidentate with example. 
2 months ago

Answers : (1)

Arun
23325 Points
							
Bidentate ligand
 
A bidentate ligand has two points at which it can attach to the central atom. One example of such a ligand is:
oxalate ion
258-1592_oxalate.gif
The two single-bonded oxygen atoms can each donate electrons to a central atom.
Three oxalate ions can coordinate a single central atom, giving an octahedral complex.
 
Ambidentate ligand
Ligands with more than one potential donor atom are known as ambidentate, such as the thiocyanate ion, NCS-, which can bind to the metal center with either the nitrogen or sulphur atoms. Examples of ambidentate ligands include NO2-/ONO- (O and N), and SO32-/OSO22- (O and S), where the first named atom refers to that which is bonded to the metal center.
 
The existence of ambidentate ligands means that there can be linkage isomerism: [Co(NO2)(NH3)5]2+ exists in a red form and a yellow form. The red form has the NO2- group bound by oxygen, when the ligand is known as the nitrito group, and the yellow form has the NO2- group bound by nitrogen, when the ligand is known as the nitro group.
2 months ago
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