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

Potentiometric studies on the formation of silver(I) chelates of EDTA alkyl and isoalkyl derivatives

L. Sirotková, M. Kalina, E. Dvořáková, and V. Novák

Lehrstuhl für Analytische Chemie der Pharmazeutischen Fakultät der Komenský-Universität, 880 34 Bratislava

Abstract: A series of complexanes, (1,2-diaminopropane-, 1,2-diaminobutane-,1,2-diaminopentane-, 3-methyl-1,2-diaminobutane-, 4-methyl-1,2-diaminopentane-N,N,N'N'-tetraacetic acid) as well as meso- and rac-2,3-diaminobutane-N,N,N',N'-tetraacetic acid (DBTA) was studied as to the formation of complexes with Ag(I) ions on the basis of potentiometric neutralization curves. The formation of complexes from EDTA, DCTZ, and trimethylenediamino-N,N,N',N'-tetraacetic acid were investigated. The stability consts. for AgL^3- and AgHL^2- complexes at 293.2 K and ionic strength 0.1 (KNO₃) were evaluated. The higher stability of Ag complexes of 1,2-diaminoalkane- and 1,2-diaminoisoalkane-N,N,N',N'-tetraacetic acids agrees with the higher basicity. In the case of DBTA, the different complex stabilities, obsd. for the 2 stereoisomers, are explained in terms of steric factors.

Full paper in Portable Document Format: 353a339.pdf (in German)

Chemical Papers 35 (3) 339–343 (1981)