Nmr relaxation studies in solution of transition metal complexes. I. Exchange reactions in aqueous solution of copper(II)-glycine system

I. Nagypál, Ferenc Debreczeni, Robert E. Connick

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The equilibrium dynamics in aqueous solutions of copper(II)-glycine system have been investigated by measuring the transverse relaxation time of water protons in a wide concentration range. The use of a general method is illustrated to represent the paramagnetic contribution of the multi-site exchange processes involving paramagnetic site(s) to the measured relaxation time of water protons. It has been experimentally verified that the -NH2 ⇌ H2O proton exchange may be the rate determining step in transferring the effect of paramagnetic relaxation to the measured relaxation time of water protons. The rate constants for the G- + H2O ⇌ HG± + OH- and for the G o- + HG± ⇌ H G o± + G- protonexchanges are determined. It is shown that the rate constants of the CuG2 + G o- k2 CuG G o + G- and {A figure is presented} processes could not be determined individually; only their combination of 3k2 + 2k-3 can be given. A suggestion for the mechanism of the ligand exchange is put forward.

Original languageEnglish
Pages (from-to)225-231
Number of pages7
JournalInorganica Chimica Acta
Volume48
Issue numberC
DOIs
Publication statusPublished - 1981

Fingerprint

Coordination Complexes
glycine
Metal complexes
Glycine
Transition metals
Protons
Amino acids
Copper
Ion exchange
transition metals
Relaxation time
aqueous solutions
copper
protons
relaxation time
Water
Rate constants
water
suggestion
Ligands

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Nmr relaxation studies in solution of transition metal complexes. I. Exchange reactions in aqueous solution of copper(II)-glycine system. / Nagypál, I.; Debreczeni, Ferenc; Connick, Robert E.

In: Inorganica Chimica Acta, Vol. 48, No. C, 1981, p. 225-231.

Research output: Contribution to journalArticle

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