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New complexanes. XXVII. Synthesis of ethylenediamine-N,N'-dimalonic and ethylenediamine-N,N'-2,2-diglutaric acids and potentiometric estimation of their complexes with alkaline earth metal ions

E. Dvořáková, M. Struhár, J. Majer, and L. Kabelíková

Lehrstuhl für Analytisclie CJiemie der Pharmazeutischen Fakultät an der Komenský-Universität, 880 34 Bratislava

 

Abstract: The synthesis of two new complexanes of the type of ethylenediamine-N,N'-bisialkanedicarboxylic) acids, namely ethylenediamine-N,N'-dimalonic and ethylenediamine-N,N'-(2,2'-diglutaric) acids, is described. From the Potentiometrie neutralization curves their pKa values and stability constants of chelates of the type ML2 - and MHL- with Ca(II), Sr(II), Ba(II), and Mg(II) ions for the ionic strength / = 0.10 and t = 20°C were determined. The acid-base and chelate-forming properties of these reagents containing secondary — NH— groups in the molecule with respect to the complexanes of similar structure were compared.

Full paper in Portable Document Format: 273a313.pdf (in German)

 

Chemical Papers 27 (3) 313–317 (1973)

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