stability constant concept

Question

Higher stability of chelates compared to analogous monodentate complexes is primarily due to:

RankGuru · Accepted Answer

1. **Chelation**: When a multidentate ligand binds to a metal to form a ring structure.
2. **Thermodynamic Basis**: Consider the displacement reaction:
   $[M(NH_3)_6] + 3(en) 	o [M(en)_3] + 6(NH_3)$.
3. **Entropy ($\Delta S$)**: In this reaction, $4$ reactant particles produce $7$ product particles. This large increase in molecular dispersal leads to a high **entropy gain**.
4. **Stability**: This favorable entropy change makes the formation constant ($β$) for chelates several orders of magnitude higher than for non-chelating complexes.

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stability constant concept

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