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Polydentate Ligands

Total number ...

Question

Total number of ligands which can act as bidentate / polydentate ligands with same donor atoms/sites.
DMG, en, Phen, Gly, acac, $S O_{4}^{2 -},$ pyridine, $P P h_{3}$

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Solution

Dimethylglyoxime (DMG), Ethylene diamine (en), Phenanthroline (phen) , Acetylacetonato ion (acac), $S O_{4}^{2 -}$ are bidendate ligands as they all contain two donor sites as can be seen from their structures.
The two donor atoms of glycine are $N$ and $O$
pyridine, $P P h_{3}$ are unidendate ligands as they contain only one donor site.

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Q. Consider the following ligands

N H_{2}^{-}

, acac (Acetylacetone),

O H^{-}

O_{2}^{-}

N O_{2}^{-}, C O_{3}^{2 -}, C l^{-}, C H_{3} C O O^{-}, e n, S O_{4}^{2 -}, N_{2}^{-}

. Then calculate value of "

P + Q - R - S "

. Here
P: Total number of ligands which act as bridging as well as monodentate only.
Q: Total number of flexidentate ligands.
R: Total number of bidentate ligands only.
S: Total number of unsymmetrical bidentate ligands.

N (C H_{2} C H_{2} N H_{2})_{3}

and EDTA are examples of polydentate ligands. Reason: The ligand which can ligate through two different atoms is called polydentate ligand.

Q. Find the number of ligand(s) which is/are chelating among the following :
en, C

_{2}

_{4}^{2 -}

, acac, DMG, gly

Q. When a polydentate ligand uses all its donor atoms simultaneously to bond to a single metal ion it is said to be a ______ ligand

Q. Which of the following can act as both monodentate and bidentate ligand?

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