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

New complexanes. XLII. PMR study of interaction of 2-hydroxy-1,3-propanediamine-N,N,N',N'-tetraacetic acid with alkaline earth metal ions in aqueous solutions

P. Novomeský, P. Balgavý, and J. Majer

Department of Analytical Chemistry, Faculty of Pharmacy, Komenský University, 832 32 Bratislava

Abstract:  The complex formation of 2-hydroxy-l,3-propanediamine-N,N,N',N'-tetraacetic acid (HPDTA) with Mg(II), Ca(II), Sr(II), and Ba(II) ions in equimolar aqueous solutions was found to be of 1:1 stoichiometry on the basis of the dependence of the chemical shifts of nonlabile protons in the ligand on pD. It was found that in MgHPDTA, CaHPDTA, and SrHPDTA complexes the nitrogen atoms of amino groups and the oxygen ones of carboxyl groups are coordinated to the central ion, in BaHPDTA also an oxygen atom of hydroxyl group is coordinated. In solutions with an excess of ligand the complex formation of 1:2 composition is supposed as well.

Full paper in Portable Document Format: 364a489.pdf

Chemical Papers 36 (4) 489–499 (1982)