Thermodynamics of Aqueous Complexation Reactions
Summary
The thermodynamics of aqueous complexation reactions examines the energetic and equilibrium aspects of ligand–metal interactions in water. Central to this field are stability constants, which quantify the affinity between metal cations and organic or inorganic ligands, and the associated changes in Gibbs free energy, enthalpy and entropy that govern complex formation. Temperature, pH and ionic strength exert a profound influence on speciation profiles, guiding the distribution of complexes and informing predictions of metal mobility, bioavailability and reactivity in environmental and biological systems. Advances in potentiometry, calorimetry and spectroscopic techniques have enabled precise determination of equilibrium constants and thermodynamic parameters, unveiling the balance between enthalpic driving forces and entropic contributions. This understanding underpins applications ranging from heavy‐metal sequestration and water treatment to drug design and metalloprotein chemistry, illustrating the global significance of tailoring ligand frameworks to achieve desired binding thermodynamics and kinetics.
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Thermodynamics of Aqueous Complexation Reactions publication trend
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Technical terms
Stability constant (β): dimensionless equilibrium constant quantifying the formation of a metal–ligand complex in solution.
Gibbs free energy change (ΔG): the energy difference that determines the spontaneity of complex formation under constant temperature and pressure.
Enthalpy change (ΔH): the heat absorbed or released during complexation, reflecting bond formation and hydration effects.
Entropy change (ΔS): the change in system disorder accompanying complex formation, often influenced by solvent reorganisation.
pL0.5: the negative logarithm of the total ligand concentration required to bind 50% of a trace metal ion under defined conditions.
Ionic strength (I): a measure of the total concentration of ionic species in solution, affecting activity coefficients and apparent stability constants.
References
- From speciation study to removal of Pb2+ from natural waters by a carnosine-based polyacrylamide/azlactone copolymer. Journal of Environmental Management (2023).
- Deferiprone: new environmental perspectives. Insights into its sequestering ability vs. different metal cations. Ecotoxicology and Environmental Safety (2024).
- Metronidazole Interaction with Cu2+ and Zn2+: Speciation Study in Aqueous Solution and Biological Activity Evaluation. ACS Omega (2024).
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