NMR relaxation studies in solutions of transition metal complexes. IX. Dynamics of equilibria in aqueous solutions of some copper(II)nitrilotriacetate-B ligand mixed ligand complexes

F. Debreczeni, I. Nagypál

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9 Citations (Scopus)

Abstract

The formation constants of the complexes formed in the copper(II)-nitrilotriacetate (NTA3- parent and in the copper(II)-NTA3--glycinate, copper(II)-NTA3--ammonia and copper(II)-NTA3--methylamine mixed ligand equilibrium systems in aqueous solution have been determined by pH-metry at 25°C in 1 M KCl. The dynamics of equilibria have been studied using the NMR relaxation technique. The glycinate ligand is thought to be more loosely bound to the central copper(II) ion in the mixed complex than in the parent one. In spite of this the ligand exchange rate is much slower, thus the thermodynamic stabilization is reflected in the increase of the kinetic stability of the mixed ligand complex also. The surprisingly high molar relaxation coefficient of the CuNTANH3 mixed complex is interpreted by the fast formation and dissociation of the mixed ligand complex, {A figure is presented} with a forward rate constant of 2.1 × 108 M-1 s.

Original languageEnglish
Pages (from-to)61-65
Number of pages5
JournalInorganica Chimica Acta
Volume72
Issue numberC
DOIs
Publication statusPublished - 1983

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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