61916-40-3Relevant academic research and scientific papers
Solid-state chelation of metal ions by ethylenediaminetetraacetate intercalated in a layered double hydroxide
Tarasov, Konstantin A.,O'Hare, Dermot,Isupov, Vitaly P.
, p. 1919 - 1927 (2003)
The solid-state chelation of transition metal ions (Co2+, Ni2+, and Cu2+) from aqueous solutions into the lithium aluminum layered double hydroxide ([LiAl2(OH)6]Cl·0.5H2O or LDH) which has been pre-intercalated with EDTA (ethylenediaminetetraacetate) ligand has been investigated. The intercalated metal cations form [M(edta)]2- complexes between the LDH layers as indicated by elemental analysis, powder X-ray diffraction, and IR and UV-vis spectroscopies. If metal chloride or nitrate salts are used in the reaction with the LDH then co-intercalation of either the Cl- or NO3- anions is observed. In the case of metal acetate salts the cations intercalate without the accompanying anion. This can be explained by the different intercalation selectivity of the anions in relation to the LDH. In the latter case the introduction of the positive charge into LDH structure was compensated for by the release from the solid of the equivalent quantity of lithium and hydrogen cations. Time-resolved in-situ X-ray diffraction measurements have revealed that the chelation/intercalation reactions proceed very quickly. The rate of the reaction found for nickel acetate depends on concentration as ～k[Ni(Ac)2]3.
Mixed-Ligand Ethylenediaminetetraacetato Cobalt(II), Nickel(II), Copper(II), and Zinc(II) Complexes with Ammonia and Hydrazine
Kryatov,Budarin
, p. 536 - 539 (2008/10/08)
The mixed-ligand complexes Na2[M(Cdta)(NH3)] · mH2O (M = Co, Ni, Cu, Zn) and Na2[M(edta)(N2H4)] · nH2O (M = Co, Ni, Zn) are obtained by interacting Na2[M(edta)] · kH2O (M = Co, Ni, Cu, Zn) with ammonia gas and hydrazine hydrate vapors, respectively. The absorption spectra of the compounds in the visible and IR regions are recorded. The stepwise formation constants of the [M(edta)A]2- (A = NH3, N2H4) and [M(edta)(N2H4)2]2- complexes in aqueous solution at 25°C and μ = 0.1 are determined spectrophotometrically.
