Collect. Czech. Chem. Commun. 1989, 54, 653-662

Potentiometric and NMR study of ethylenediamine-N,N,N',N'-tetrakis[methylene(phenylphosphinic)] acid and its complexing properties

Ivan LukeŇ°a, Petr Hermanna and Pavel Pechb

a Department of Inorganic Chemistry, Charles University, 128 40 Prague 2
b Laboratory of Nuclear Magnetic Resonance, Prague Institute of Chemical Technology, 166 28 Prague 6


The dissociation constants of ethylenediamine-tetrakis-[methylene(phenylphosphinic)] acid (H4edtmpPh) and its stability constants with Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Fe2+, Co2+ and Ni2+ have been determined. Study of the dependence of the 1H, 31P and 13C NMR spectra of H4edtmpPh solutions on the pH indicates that it is more similar to H4edta than to analogous phosphonic acids.