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What is meant by chelating effect?

What is meant by chelating effect?

Grade:12

8 Answers

sathish b
42 Points
6 years ago
A bidentate (or) a poly dentate ligand is known as chelating ligand if on coordination it results in the formation of a closed (or) cyclic structure.Chelating ligands form more stable complexes than the monodentate ligands. This is called chelating effect.
PRAPULPODISHETTI
669 Points
6 years ago
A bidentate (or) a poly dentate ligand is known as chelating ligand if on coordination it results in the formation of a closed (or) cyclic structure.Chelating ligands form more stable complexes than the monodentate ligands. This is called chelating effect.
RAJU
398 Points
6 years ago
The chelate effect describes the enhanced affinity of chelating ligands for a metal ion compared to the affinity of a collection of similar nonchelating (monodentate) ligands for the same metal.
ROHIT
26 Points
6 years ago
The chelate effect describes the enhanced affinity of chelating ligands for a metal ion compared to the affinity of a collection of similar nonchelating (monodentate) ligands for the same metal.
KUNCHAM SAMPATH
402 Points
6 years ago

The chelate effect describes the enhanced affinity of chelating ligands for a metal ion compared to the affinity of a collection of similar nonchelating (monodentate) ligands for the same metal.

Consider the two equilibria, in aqueous solution, between the copper(II) ion, Cu2+ and ethylenediamine (en) on the one hand and methylamine, MeNH2 on the other.

(2)2+]2)2 [Cu(MeNHis in equilibrium with 2 + 2 MeNH2+Cu (1)2+ [Cu(en)]is in equilibrium with + en 2+Cu

In (1) the bidentate ligand ethylenediamine forms a chelate complex with the copper ion. Chelation results in the formation of a five-membered CuC2N2 ring. In (2) the bidentate ligand is replaced by two monodentate methylamine ligands of approximately the same donor power, meaning that the enthalpy of formation of Cu—N bonds is approximately the same in the two reactions.

The thermodynamic approach to describing the chelate effect considers the equilibrium constant for the reaction: the larger the equilibrium constant, the higher the concentration of the complex.

2]2[Cu][MeNH12]= β2)2[Cu(MeNH [Cu][en]11[Cu(en)] =β

Electrical charges have been omitted for simplicity of notation. The square brackets indicate concentration, and the subscripts to the stability constants, β, indicate the stoichiometry of the complex. When the analytical concentration of methylamine is twice that of ethylenediamine and the concentration of copper is the same in both reactions, the concentration [Cu(en)] is much higher than the concentration [Cu(MeNH2)2] because β11 >> β12.

An equilibrium constant, K, is related to the standard Gibbs free energy, ΔGStrikeO.png by

SHANMUKESHWAR
461 Points
6 years ago
The chelate effect describes the enhanced affinity of chelating ligands for a metal ion compared to the affinity of a collection of similar nonchelating (monodentate) ligands for the same metal.
pa1
357 Points
6 years ago
A bidentate (or) a poly dentate ligand is known as chelating ligand if on coordination it results in the formation of a closed (or) cyclic structure.Chelating ligands form more stable complexes than the monodentate ligands. This is called chelating effect.
E.Nandhini ketha
115 Points
3 years ago
The chelate effect is the enhanced affinity ofchelating ligands for a metal ion compared to the affinity of a collection of similar nonchelating  ligands for the same metal.

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