Ligand effects on the kinetics of the reversible binding of NO to selected aminocarboxylato complexes of iron(II) in aqueous solution

Thorsten Schneppensieper, Alicja Wanat, Grazyna Stochel, Sara Goldstein, Dan Meyerstein, Rudi Van Eldik

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62 Scopus citations

Abstract

Rate constants for the formation and dissociation of FeII(L)NO (L = aminocarboxylato) have been determined using stopped-flow, temperature jump, flash photolysis, and pulse radiolysis techniques. For a series of ligands the formation rate constants vary between 1.6 × 106 and 2.4 × 108 M-1 s-1, whereas the dissociation rate constants vary between 0.11 and 3.2 × 103 s-1 at 25°C. These rate constants result in stability constants (KNO = k1/kd) ranging from 5.0 × 102 to 1.1 × 107 M-1, which are in good agreement with values of KNO determined by a combined spectrophotometric and potentiometric technique. The results are discussed with reference to available literature data, and interpreted in terms of a generalized reaction mechanism.

Original languageEnglish
Pages (from-to)2317-2325
Number of pages9
JournalEuropean Journal of Inorganic Chemistry
Issue number9
DOIs
StatePublished - 1 Jan 2001

Keywords

  • Catalysts
  • Chelates
  • Iron
  • Kinetics
  • Nitrogen oxides

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