Abstract

The free energy changes for Ag(I) single and mixed ligand complex formation in water solution at T = 25 ° C and ionic strength μ = 1 for KNO 3 has been examined. Ionic charges of both the substratum and ligand in the reaction Sub + L = Sub-L do not play the most prominent role in driving the formation of these complexes in the investigated medium. The mutual substratum-to-ligand chemical affinity depends of course on the nature of the central ion and the ligand but also on the nature of their chemical environment. The already coordinated ligand (ligands) modify the ability of the central ion to form further coordinative bonds in inverse ratio to the overall thermodynamic stability of the substratum. On these bases, the occurrence of Non-Linear Free Energy Relationships are postulated.

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