Affordable Access

Publisher Website

Divalent metal complexes ofmeso- anddl-2,3-diaminobutane-N,N,N′,N′-tetra-acetic acid

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
33
Issue
1
Identifiers
DOI: 10.1016/0022-1902(71)80022-2

Abstract

Abstract Stability constants of complexes of Mn, Cu(II), Zn, Cd and Hg(II) with meso- and dl- 2,3-diaminobutane-N,N,N′,N′-tetra acetic acid (DIMEDTA) valid for 20·0°C and μ = 0·1 M (KNO 3) have been obtained potentiometrically by a modification of Schwarzenbach's mercury-drop procedure adapted to continuous titration. In view of a discrepancy between the value thus found for the stability of the cadmium complex with the meso-isomer and that recently reported by Czech authors, a redetermination was made by the method of corresponding solutions using the cupric complex of meso-DIMEDTA as the coloured species. This procedure was first tested with the EDTA system and led to the value log K CdY = 16·76 ± 0·08 in fair agreement with the literature value. Differences in the stability of complexes with a particular metal and meso- or dl-DIMEDTA are explained on conformational grounds and discussed in relation to the stability of complexes with analogous ligands such as EDTA, PDTA and DCTA.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments