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Open Chemistry

formerly Central European Journal of Chemistry

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Volume 13, Issue 1


Volume 13 (2015)

Investigations of ternary complexes of Co(II) and Ni(II) with thiodiacetate anion and 1,10-phenanthroline or 2,2’-bipyridine in aqueous solutions

Dariusz Wyrzykowski
  • Corresponding author
  • Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Joanna Pranczk / Dagmara Jacewicz / Aleksandra Tesmar / Bogusław Pilarski / Lech Chmurzyński
Published Online: 2014-11-26 | DOI: https://doi.org/10.1515/chem-2015-0048


A potentiometric titration method (PT) and a stopped-flow kinetic technique monitored by a UV−Vis spectroscopy have been used to characterize the stability of series of Co(II)- and Ni(II)-thiodiacetato complexes, M(TDA), in the presence of 1,10-phenanthroline (phen) or 2,2’-bipyridine (bipy) in aqueous solutions. The stability constants of the binary (1:1), ternary (1:1:1) as well as the resulting hydroxo complexes were evaluated and compared to the corresponding oxydiacetate complexes. Based on the species distribution as a function of pH the relative predominance of the species in the system over a pH range was discussed. Furthermore, the kinetic measurements of the substitution reactions of the aqua ligands to phen or bipy in the coordination sphere of the binary complexes M(TDA) were performed in the 288–303 K temperature range, at a constant concentration of phen or bipy and at seven different concentrations of the binary complexes (0.2–0.5 mM). The kinetic stability of the M(TDA) complexes was discussed in relation to the experimental conditions and the kind of the auxiliary ligands (phen/bipy). Moreover, the influence of the type of primary ligand (thiodiacetate/oxydiacetate) on the substitution rate of the auxiliary ligands was also compared.

Graphical Abstract

Keywords : thiodiacetate complexes; ternary complexes; potentiometric titration; stopped-flow method


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About the article

Received: 2014-02-07

Accepted: 2014-06-16

Published Online: 2014-11-26

Citation Information: Open Chemistry, Volume 13, Issue 1, ISSN (Online) 2391-5420, DOI: https://doi.org/10.1515/chem-2015-0048.

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© 2015 Dariusz Wyrzykowski et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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