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

• Authors: Dariusz Wyrzykowski , Joanna Pranczk , Dagmara Jacewicz , Aleksandra Tesmar , Bogusław Pilarski , Lech Chmurzyński
• Languages of publication: EN

Abstracts

EN

Potentiometric (PT) and conductometric (CT) titration methods have been used to determine the stoichiometry and formation constants in water for a series of ternary complexes of Co(II) and Ni(II) involving the oxydiacetate anion (ODA) and 1,10-phenanthroline (phen) or 2,2′-bipyridine (bipy) ligands, namely [Co(ODA)(phen)(H2O)], [Co(ODA)(bpy)(H2O)], [Ni(ODA)(phen)(H2O)] and [Ni(ODA)(bpy)(H2O)]. The ternary complex formation process was found to take place in a stepwise manner in which the oxydiacetate ligand acts as a primary ligand and the phen or bipy ligands act as auxiliary ones. The stability of the ternary complexes formed is discussed in the relation to the corresponding binary ones. Furthermore, the kinetics of the substitution reactions of the aqua ligands in the coordination sphere of the Ni-ODA and Co-ODA complexes to phen or bipy were studied by the stopped-flow method. The kinetic measurements 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 (4–7 mM). The influence of experimental conditions and the kind of the auxiliary ligands (phen/bipy) on the substitution rate was discussed. [...]

Keywords

EN

Oxydiacetate complexes; Ternary complexes; Potentiometric titration; Stopped-flow method

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2014
• Volume: 12
• Issue: 1
• Pages: 107-114

Dates

published

1 - 1 - 2014

online

27 - 10 - 2013

Contributors

author

Dariusz Wyrzykowski

• Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland

author

Joanna Pranczk

• Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland

author

Dagmara Jacewicz

• Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland

author

Aleksandra Tesmar

• Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland

author

Bogusław Pilarski

• Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Gdańsk, 80-952, Gdańsk, Poland

author

Lech Chmurzyński

• Department of General and Inorganic Chemistry, Faculty of Chemistry, University of Gdańsk, Gdańsk, Poland

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Identifiers

DOI

10.2478/s11532-013-0353-x