Investigations of ternary complexes of Co (II) and Ni (II) with thiodiacetate anion and 1,10-phenanthroline or 2,2’-bipyridine in aqueous solutions
Abstract: 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.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Investigations of ternary complexes of Co (II) and Ni (II) with thiodiacetate anion and 1,10-phenanthroline or 2,2’-bipyridine in aqueous solutions ; volume:13 ; number:1 ; year:2014 ; extent:7
Open chemistry ; 13, Heft 1 (2014) (gesamt 7)
- Urheber
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Wyrzykowski, Dariusz
Pranczk, Joanna
Jacewicz, Dagmara
Tesmar, Aleksandra
Pilarski, Bogusław
Chmurzyński, Lech
- DOI
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10.1515/chem-2015-0048
- URN
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urn:nbn:de:101:1-2410151804224.663519855021
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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15.08.2025, 07:27 MESZ
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Beteiligte
- Wyrzykowski, Dariusz
- Pranczk, Joanna
- Jacewicz, Dagmara
- Tesmar, Aleksandra
- Pilarski, Bogusław
- Chmurzyński, Lech
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Investigations of ternary complexes of Co (II) and Ni (II) with oxydiacetate anion and 1,10-phenanthroline or 2,2′-bipyridine in solutions
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