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

New complexanes. VIII. Ethylenediamino-N,N' -disuccinic acid and investigation of its heavy metal complexes by spectrophotometry

J. Majer, Š. Springer, and B. Kopecká

Komenský University, Bratislava

Abstract:   The synthesis of ethylenediamino-N,N' -disuccinic acid (I) and the formation of new complexes with heavy metals and their spectrophotometric detn. were described. The relation of the complexes to pH, absorption spectra curves, the compn., and stability consts. are given. I was prepd. by the condensation of ethylenedibromide with aspartic acid in an alk. medium. I became brown at 210°. The compn. of complexes of Cu²⁺, Co²⁺, Co³⁺, Ni²⁺, and Fe³⁺ with I was detd. by the molar ratio method and in the case of Zn²⁺, Pb²⁺, and Cd²⁺ complexes with the method in the uv region (220 m.oeligat.). In all cases the ratio of I to heavy metal was 1:1. The stability consts. (log K) are: Fe³⁺ 22.0, Cu²⁺ 18.45, Ni²+ 18.02, Co²+ 14.02, Zn²⁺ 12.9, Pb²⁺ 12.3, and Cd²⁺ 11.5. Compared to EDTA, these values are lower except for Cu²⁺ which is practically the same.

Full paper in Portable Document Format: 206a414.pdf (in Slovak)

Chemical Papers 20 (6) 414–422 (1966)