Thermodynamic and kinetic stability of cerium(IV) complexes with a series of aminopolyacetic acids


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The compositions, stability constants, and rate constants of intramolecular redox decomposition of cerium(IV) complexes with anions of aminoacetic (H2NCH2COOH), iminodiacetic [HN(CH2COOH)2], nitrilotriacetic [N(CH2COOH)3], ethylenediaminetetraacetic [(CH2COOH)2N(CH2)2N(CH2COOH)2], and hexamethylenediaminetetraacetic [(CH2COOH)2N(CH2)6N(CH2COOH)2] acids were determined by potentiometric, spectrophotometric, and kinetic methods at pH in the range 1.3−2.0 in perchlorate and nitrate media at an ionic strength I = 0.1 and a temperature of 298.15 K. Direct linear correlation between the logarithms of the stability constants of the complexes, log β101, and logarithms of the cumulative protonation constants, log Вm+k (k = 1–2), of aminopolyacetic acid anions Lm–, and inverse linear correlation between log β101 and logarithms of the rate constants of intramolecular redox decomposition of the complexonates [CeL]4–m (m = 1–4), log kn=1, were found.

Sobre autores

O. Voskresenskaya

Joint Institute for Nuclear Research

Autor responsável pela correspondência
Email: voskr@jinr.ru
Rússia, ul. Zholio Kuri 6, Dubna, Moscow oblast, 141980

N. Skorik

Tomsk State University

Email: voskr@jinr.ru
Rússia, pr. Lenina 36, Tomsk, 634050

N. Stepanova

Biisk Institute of Technology

Email: voskr@jinr.ru
Rússia, ul. Trofimova 27, Biisk, Altai krai, 659305

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