ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

New complexanes. XXXVII. Acid-base properties of N-(carbamoylmethyl)iminodiacetic and N-(2-carbamoylethyl)iminodiacetic acid and the formation of their complexes with alkaline earth cations and bivalent cations of heavy metals

I. Benedikovič, P. Balgavý, J. Majer, E. Fűleová, and I. Valášková

Department of Analytical Chemistry, Faculty of Pharmacy, Komenský University, 880 34 Bratislava

Abstract:  The preparation of N-(carbamoylmethyl)iminodiacetic and N-(2-carbamoylethyl)iminodiacetic acid is described. The results of study of the acid-base properties of these acids obtained by means of ¹H-n.m.r. spectros­ copy and Potentiometrie neutralization titration as well as the data about formation of complexes of these substances with Ca(II), Mg(II), Sr(II), Ba(II), Cu(II), Co(II), Cd(II), Ni(II), Pb(II), and Zn(II) obtained by means of direct Potentiometrie neutralization titration and paper electrophoresis are presen­ ted. The values of protonation constants K_H2L and K_HL and the values of stability constants log K_ML and log K_ML2 found under standard conditions at I = 0.1 (KN0 3 ) and 20°C are also given in this paper. The results are discussed from the view-point of formation of a coordination bond between the amide group and central ion in the complex ML. That bond does not arise in the complexes ML₂ containing the above cations.

Full paper in Portable Document Format: 341a78.pdf

Chemical Papers 34 (1) 78–92 (1980)