THE STABILITY OF THE METAL-COMPLEXES OF CYCLIC TETRA-AZA TETRAACETIC ACIDS
THE STABILITY OF THE METAL-COMPLEXES OF CYCLIC TETRA-AZA TETRAACETIC ACIDS
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DOI：
10.1016/0039-9140(92)80028-c
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发表时间：
1992-03-01
期刊：
影响因子：
6.1
通讯作者：
DASILVA, JJRF
中科院分区：
文献类型：
--
作者：
CHAVES, S;DELGADO, R;DASILVA, JJRF
用自动滴定仪测定了三种四氮杂大环配位化合物（DOTA、TRITA和TETA）与Mn ~（2+）、Fe ~（2+）、Co ~（2+）、Ni ~（2+）、Cu ~（2+）、Zn ~（2+）、Cd ~（2+）和Pb ~（2+）形成的配合物的稳定常数，并用Superquad程序进行了计算，证实并扩展了已有的数值范围。结果表明，DOTA是一种强配体，但对金属离子对没有选择性，而TETA虽然没有DOTA那么强，但对金属离子对有选择性。Cd 2+和Pb 2+。
The stability constants of the complexes formed by three tetra-aza macrocyclic complexones (DOTA, TRITA and TETA) with Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+ and Pb2+ were determined with an automated titration instrument with data acquisition and the calculations were performed with the Superquad program, confirming and extending the range of values previously available. Both 1:1 and 2:1 metal-to-ligand complexes were now considered including their protonated species.The results show that DOTA is a powerful but unselective ligand whereas TETA, although not so powerful as DOTA, is an interesting selective ligand for pairs of metal ions, e.g., Cd2+ and Pb2+.