Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (1): 70-75.DOI: 10.11944/j.issn.1000-0518.2016.01.150208

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Solid and Solution Properties of Zinc(Ⅱ) and Cobalt(Ⅱ) with Ethylenediaminetriacetate

WU Rui,YANG Yuchen,DONG Xin,ZHOU Zhaohui()   

  1. College of Chemistry and Chemical Engineering,State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005,China
  • Received:2015-06-19 Accepted:2015-10-08 Published:2016-01-05 Online:2016-01-05
  • Contact: ZHOU Zhaohui
  • Supported by:
    Supported by the Research Funds for the Central Universities (No.20720150041) and the Program for Innovative Research Team in Chinese Universities(No.IRT_14R31)

Abstract:

Zinc and cobolt ethylenediaminetriacetates [M(H2O)6][M(ED3A)(H2O)]2·2H2O[M=Zn(1), Co(2); H3ED3A=ethylenediaminetriacetic acid, C8H14N2O6] were obtained on the hydrothermal conditions at 140 ℃ in a weak acidic solution. Complexes 1 and 2 were characterized by elemental analysis, IR, TG-DTG, solution 13C NMR spectroscopy, and X-ray analysis. ED3A coordinates with zinc or cobalt ions as a pentadentate ligand. The metal ions are arranged in octahedral coordination geometries [MN2O4] or [MO6]. Comparisons of 13C NMR spectra demonstrate that the coordination of ED3A zinc complex is stable in weak acidic solution(pH 3~7), while ED3A cyclizes to form ketopiperazinediacetic acid(H2kpda, C8H12N2O5) under acidic condition.

Key words: ethylenediaminetriacetic acid, ketopiperazinediacetic acid, equilibrium, zinc, cobalt, 13C NMR spectra