Abstract
Regression analysis was used to derive equations for estimaing thermodynamic stability constants for complexes of Cr2+ (logβ° 1[Cr2+L] = 0.53logβ° n [H n L]) and Cr3+ (logβ° 1[Cr3+L] = 0.88logβ° n [H n L]) from the known protonation constants of H n L ligands and for determining stability constants of Cr2+ and Cr3+ complexes from the available stability constants of Cu2+ complexes (logβ° 1[Cr2+L] = 0.76logβ° 1[Cu2+L] and logβ° 1[Cr2+L] = 0.60logβ° 1[Cr3+L], respectively). Parameters of the Panteleon–Ecka equation for calculating stability constants of Cr2+ complexes (λ = 0.57) and Cr3+ complexes (λ = 0.69) with two and three bidentate ligands were also determined. The ratio of logarithmic stability constants for complexes with the same metals but with different metal ionic charges was found to be approximately equal to the ratio of charges on the central ions. The stability constant of Cr(II) sulfate complex was calculated.
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