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New Complexanes. XXI. Complex-forming Properties of the N,N-Bis(2-hydroxyethyl)arninornethylphosphoiiic Acid

R. Karlíček, J. Majer, and J. Polakovičová

Department of Analytical Chemistry, Faculty of Pharmacy, Komenský University, Bratislava 1


Abstract: Acid-base properties of N,N-bis(2-hydroxyethyl)amiuomethylphosphomc acid have been, studied by Potentiometrie titration. Thus the values pKa1 = 4.98 and pKa2 = 9.46 have been found (I = 0.1 NaC104, 20°C). The regions of existence, the composition, equilibrium constants, and stability constants of the chelates with some heavy metals have been defined spectrophotometrically. It has been found that only complexes having the composition M : L = 1:1 but with different charges are formed from Cu(II) and Fe(III). On the other hand, Ni(II) may also form a complex with the composition M : L = 1 : 2. The complex-forming properties are also compared to those of N,N-bis(2-hydroxyethyl)glycine.

Full paper in Portable Document Format: 243a161.pdf


Chemical Papers 24 (3) 161–172 (1970)

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