What is chelate effect explain the factors affecting?
The chelate effect or chelation may simply be defined as an equilibrium reaction between the complexing agent and a metal ion, characterized by the formation of two or more bonds between metal and the complexing agent, resulting in the formation of a ring structure including the metal ion.
What are the factors affecting the stability of complexes?
There are several factors that can affect the stability of the metal complexes [2, 5, 8, 9], which include:
- Nature of the central metal ion.
- Nature of the ligand.
- Chelating effect.
- Macrocyclic effect.
- Resonance effect.
- Steric effect or steric hindrance.
What is chelate and chelate effect?
The chelate effect is the enhanced affinity of a chelating ligand for a metal ion compared to its monodentate ligand counterpart(s). This term comes from the Greek chelos, meaning “crab”. Tridentate ligands, which bind through three donors, can bind even more tightly than bidentate, and so on.
How does chelation affect entropy?
(1) The entropy from free rotation of the chelator. When a chelating ligand replaces several monodentate ligands, the result is an increase in the number of free molecules in the system, meaning a relatively large increase in entropy. This is the major energetic factor driving the chelate effect.
What is chelate effect example?
The complex which contains chelating ligands is called Chelates. Complexes containing chelate rings are more stable than complex without rings. This is called the chelate effect. Examples: [Co(en)3]3+ is more stable than [Co(NH3)6]3+ where Ethylenediamine (en) is an example of a bidentate ligand.
What are the factors affecting the stability of an object?
The stability of an object is extremely dependent upon its center of gravity. The center of gravity of an object is the point at which we can consider the weight of an object to be concentrated. This is the center point from which the weight is evenly dispersed on all sides.
Which complex is more stable and why?
Thermodynamically it is favoured that a complex having monodentate ligand tends to react with either polydentate or bidentate ligands in order to form a chelate complex, as this is driven by entropy. Thus, bidentate or polydentate are considered to be more stable.