Abstract
Abstract The 1 H NMR spectra of the complexes of K, Mg, Ca, Sr, Ba and Zn ions with N -hydroxyethyl ethylenediaminetriacetic acid were measured at various temperatures. The chemical shifts of the protons on acetates and the backbone change with temperature, while those of the hydroxyethylenic protons do not, and the AB quartet arising from the single acetate coalesces into a singlet with the increase of temperature. The mechanism of the intramolecular rearrangement of the metal HEDTA complexes involves a complex process in which the Δ, Λ conversion and nitrogen inversion occur almost in the same time. It was found that the stability of these metal complexes decreases in the order Zn > alkaline earth metal > K, which is in agreement with the order of the ionic potential of the central ions.
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