NMR relaxation studies in solution of transition metal complexes. XI. Dynamics of equilibria in aqueous solutions of the copper(II)ammonia system

István Nagypál, Ferenc Debreczeni

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Abstract

The T2 relaxation time of water protons in aqueous solutions of copper(II)ammonia system at 25 °C in 2 M NH4Cl were measured as a function of the free ammonia concentration. It is shown that the NMR relaxation rate may be given as a linear combination of the concentration of the species formed in the system. The temperature dependence of the relaxation rate shows that the measured data are governed by the chemical reactions taking place in the equilibrium state in a significant range of the complex formation curve. The results are evaluated by assuming that the dissociation and formation of the successive complexes are responsible for the proton exchange between the paramagnetic and diamagnetic environment. With this assumption the following rate constants have been determined for the consecutive stepwise complex formation: {A figure is presented}.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalInorganica Chimica Acta
Volume81
Issue numberC
DOIs
Publication statusPublished - 1984

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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