论文信息 - Stabilities and Thermodynamic Properties of Ethylenediamine‐di(o‐Hydroxyphenylacetic Acid) Chelates of Tripositive Lanthanide Ions

Stabilities and Thermodynamic Properties of Ethylenediamine‐di(o‐Hydroxyphenylacetic Acid) Chelates of Tripositive Lanthanide Ions

The interaction between ethylenediamine-di(o-hydroxyphenylacetic acid) (EDDHA, H4Z) and tripositive lanthanide ions has been investigated. The formation constants of the protonated chelates (LnHZ) and those of the normal chelates (LnZ−) have been evaluated at various temperatures and at a constant ionic strength of 0.1(KNO1). For LnHZ, the pH-titrimetric technique, and for LnZ−, the mercury indicator electrode method were used. The enthalpy and entropy changes characterizing the formation of LnZ− have been calculated at 25° and, these functions have been compared with the corresponding values of other lanthanide chelates with related chelating agents.

Shwu-tzy Wu | T. Hseu | Zui-Feng. Lin

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