17084-02-5Relevant articles and documents
Electron Spin Resonance Studies of Iron(III) Complexes of Ethylenediamine-tetra-acetate and N-(2-Hydroxyethyl)ethylenediamine-NN'N'-triacetate in Co-ordinating Solvents
Migita, Catharina T.,Ogura, Kotaro,Yoshino, Takashi
, p. 1077 - 1080 (1985)
Remarkable solvent dependence of the apparent peak-to-peak linewidth (ΔHpp) has been observed for the rhombic type of e.s.r. spectra of the high-spin FeIII(edta) (edta = ethylenediaminetetra-acetate) and FeIII(hedta) hedt
Influence of the polyamino carboxylate chelating ligand (L) on the kinetics and mechanism of the formation of FeII(L)NO in the system FeII(L)/NO/HONO/NO2- in aqueous solution
Zang,Van Eldik
, p. 4462 - 4468 (2008/10/08)
FeII(L) reacts with NO, HONO, and NO2- to produce FeII(L)NO for L = diethylenetriaminepentaacetate, ethylenediaminetetraacetate, N-(hydroxyethyl)ethylenediaminetriacetate, nitrilotriacetate, ethylenediaminediacetate, and water. The reaction with HONO and NO2- occurs in two parallel paths of different order with respect to the reaction components. The systematic variation of the nature of L enables an investigation of the role of labile coordination sites on the Fe(II) center during such reactions. The parallel reactions are characterized by the rate law -d[FeII(L)]/dt = kA[HONO]2 + kB[FeII(L)][HONO], and the contribution of each path depends on the nature of L, pH, and total nitrite concentration. The kinetic data support the formation of a reactive intermediate, most probably N2O3 (kA path), and the reduction of HONO by FeII(L) to NO (kB path). The observed reactions and reactivity patterns strongly depend on the availability of labile coordinated solvent molecules on FeII(L), as governed by the nature of the ligand L. The results of this study are discussed in reference to the available literture data and in comparison to the kinetics of oxidation of these complexes by molecular oxygen.
Kinetics and mechanism of the autoxidation of iron(II) induced through chelation by ethylenediaminetetraacetate and related ligands
Zang,Van Eldik
, p. 1705 - 1711 (2008/10/08)
The oxidation of FeII(L) complexes by molecular oxygen is significantly enhanced by the presence of a chelating ligand L. The kinetics of this reaction was studied for L = ethylenediaminetetraacetate, N-(hydroxyethyl)ethylenediaminetriacetate, and diethylenetriaminepentaacetate as a function of [FeII(L)], [O2], pH, temperature, and pressure. All the observed kinetic relationships can be accounted for in terms of a mechanism in which O2 rapidly reacts with FeII(L) to produce FeII(L)O2, followed by three parallel reaction steps. These include spontaneous and acid-catalyzed electron transfer, as well as a reaction with FeII(L) to produce (L)FeIII-O22--FeIII(L). The results are discussed in reference to the available literature data for these and related oxidation processes.