IngentaConnect Prediction of Stability Constants for Cr(III) and Cr(II) Complexe...

Authors: Vinokurov E.G.^{1, 2}; Bondar' V.V.^{1, 2}

Source: Russian Journal of Coordination Chemistry, Volume 29, Number 1, January 2003 , pp. 66-72(7)

Publisher: MAIK Nauka/Interperiodica

Abstract:

Regression analysis was used to derive equations for estimaing thermodynamic stability constants for complexes of Cr²⁺ (log beta ^°₁[Cr²⁺L] = 0.53log beta ^°_n[H_nL]) and Cr³⁺ (log beta ^°₁[Cr³⁺L] = 0.88log beta ^°_n[H_nL]) from the known protonation constants of H_nL ligands and for determining stability constants of Cr²⁺ and Cr³⁺ complexes from the available stability constants of Cu²⁺ complexes (log beta ^°₁[Cr²⁺L] = 0.76log beta ^°₁[Cu²⁺L] and log beta ^°₁[Cr²⁺L] = 0.60log beta ^°₁[Cr³⁺L], respectively). Parameters of the Panteleon–Ecka equation for calculating stability constants of Cr²⁺ complexes ( lambda = 0.57) and Cr³⁺ complexes ( lambda = 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.

Language: English

Document Type: Research article

Affiliations: 1: M 2:

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Prediction of Stability Constants for Cr(III) and Cr(II) Complexes