Question
Download Solution PDFChelate effect is -
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCONCEPT:
Chelate Effect
- The chelate effect refers to the increased stability of a complex containing a chelating ligand compared to similar complexes with monodentate ligands.
- Chelating ligands can form more than one bond to the central metal ion, creating ring structures within the complex.
EXPLANATION:
- The chelate effect is largely driven by entropy change. When a chelating ligand replaces multiple monodentate ligands, there is an increase in the number of free particles (e.g., the displaced ligands), leading to a significant increase in entropy.
- Although enthalpy changes and ring size can also influence the stability of the complex, the predominant factor for the chelate effect is the entropy change that results from the release of multiple smaller ligands.
- Therefore, the main contributor to the chelate effect is the entropy change associated with the formation of the chelate complex.
The correct answer is: 2) Predominantly due to entropy change
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