Thermodynamic, kinetic and structural studies on the ternary palladium(II) complexes of thioether ligands

Zoltán Nagy, I. Fábián, I. Sóvágó

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Potentiometric, calorimetric, NMR and stopped-flow kinetic studies were performed on the palladium(II) complexes of thioether and/or nitrogen donor ligands. The ternary systems always contained a tridentate ligand (dien, terpy and dianions of dipeptides, GlyGly, GlyAla and GlyMet) and a monodentate thioether (AcMet). The stability constants of thioether complexes were obtained by indirect potentiometric measurements using uridine as a competitive ligand. The thermodynamic parameters revealed that selectivity of palladium(II) for thioether binding can be significantly influenced by the other donor atoms around the metal ion. [Pd(terpy)]2+ and [Pd(GlyMet)] had the lowest affinity for thioether binding and it was explained by steric and electronic effects. Ternary complexes of nitrogen donors have higher thermodynamic stability constants than the thioether complexes, but rate constants of the substitution reactions revealed that formation of thioether complexes is the faster reaction. As a consequence, the thermodynamic equilibrium state of a multicomponent system is characterized by the coordination of N-donors, which are formed via the existence of thioether-bonded intermediates. (C) 2000 Elsevier Science Inc.

Original languageEnglish
Pages (from-to)129-138
Number of pages10
JournalJournal of Inorganic Biochemistry
Volume79
Issue number1-4
DOIs
Publication statusPublished - Apr 30 2000

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Palladium
Sulfides
Thermodynamics
Ligands
Kinetics
Nitrogen
Dipeptides
Uridine
Ternary systems
Metal ions
Rate constants
Thermodynamic stability
Substitution reactions
Metals
Nuclear magnetic resonance
Ions
Atoms

Keywords

  • Enthalpy changes
  • Kinetic studies
  • Palladium(II) complexes
  • Stability constants
  • Thioether ligands

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

Cite this

Thermodynamic, kinetic and structural studies on the ternary palladium(II) complexes of thioether ligands. / Nagy, Zoltán; Fábián, I.; Sóvágó, I.

In: Journal of Inorganic Biochemistry, Vol. 79, No. 1-4, 30.04.2000, p. 129-138.

Research output: Contribution to journalArticle

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