Complexing Equilibria and Redox Potentials of the Ag(II)/Ag(I) System in the Presence of 2,2':6',2''-Terpyridine in Water

Article abstract of DOI:10.1007/BF00810838

The conditional protonation constants (μ = 0.1) for 2,2':6',2''-terpyridine, log K₁ = 4.93, log K₂ = 3.69, were determined by the pH-metric method.The compositions of complexes of Ag²⁺ and Ag⁺ ions with 2,2':6',2''-terpyridine (tp) were studied and equilibria of the complex formation process were described.The values of conditional complex formation constants are as follows: for Ag(tp)2⁺: log β₀₁ = 5.79, log β₀₂ = 9.68, for Ag(tp)2²⁺: log β₀₂ = 25.31, while the conditional constant of the Ag(tp)NO3 precipitate formation is : K_SO = 2.45*10⁴.Using coulometric and chronovoltamperometric measurements, the redox systems being formed in the complex solutions of Ag(II) and Ag(I) were determined and described including their formal potentials. - Keywords: Chronovoltammetry; Formal potential; pH-metry; Redox systems with silver ions; Silver complexes