Equilibrium study on Cd(II) and Zn(II) chelates of mercapto carboxylic acids
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- 作者：Crisponi ; Guido ; Diaz ; Angelo ; Nurchi ; Valeria Marina ; Pivetta ; Tiziana ; Tapia Esté ; vez ; Marí ; a José
- 关键词：Mercapto-carboxylic acid ; Potentiometry ; IR ; Formation constants ; Ionisation constants
- 刊名：Polyhedron
- 出版年：2002
- 出版时间：June 15, 2002
- 年：2002
- 卷：21
- 期：14-15
- 页码：1319-1327
- 全文大小：263 K
文摘
Cadmium(II) and zinc(II) complexes with the chelating agents meso-2,3-dimercapto succinic acid, meso-monomethyl dimercapto succinate, meso-dimethyl dimercapto succinate and the related methylmercapto acetate and mercapto succinic acid were studied potentiometrically in 0.1 M KCl at 25°C. Models and hypotheses of coordination for the solution complexes are proposed. IR characterisation and stoichiometry of the solid state compounds evaluated by elemental analysis are presented. The obtained formation constants, together with the previously measured ionisation constants of the ligands, were used to compute pCd and pZn values and then to evaluate the effectiveness of the studied chelating agents in binding Cd(II) and Zn(II) in intoxication treatments.