Bihar BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds3 Marks
Question
What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.
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Answer
A molecule or an ion which has only one donor atom to form one coordinate bond with the central metal atom is called unidentate ligand, e.g,, Cl- and NH3. A molecule or ion which contains two donor atoms and hence forms two coordinate bonds with the central metal atom is called adidentate ligend, e.g., $\text{CH}_{2}\text{NH}_{2}\ \ \text{and}\ \ \text{COO}^{-}\\| \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \\\text{CH}_{2}\text{NH}_{2}\ \ \ \ \ \ \ \ \ \ \text{COO}^{-}$ A molecule or an ion which contains two donor atoms but only one of them forms a coordinate bond at a time with the central metal atom is called ambidentate ligands, e.g.,: $\text{CN}^{-}\text{or}\ \ \text{NC}^{-}\text{and}\ \ \ \text{NO}_{2}^{-}\text{or}\ \ \text{ONO}^{-}$
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