- 作者: 許東明; 吳淑姿; 林瑞摓
- 作者服務機構: Department of Chemistry, National Taiwan University, Taipei, Taiwan, R.O.C.
- 中文摘要: The interaction between rthylenediamin-di(o-hydroxyphenylacetic acid) (EDDHA, H/sub 4/Z)and tripositive lanthanide ions has been investigated. The formation constants of the protonated chelates (LnHZ) and those of the normal chelates (LnZ/sup -/) have been evaluated at various temperatures and at a constant ionic strength of 0.1(KNO/sub 3/). For LnHZ, the pH-titrimetric technique, and for LnZ/sup -/, the mercury indicator electrode method were used. The enthalpy and entropy changes characterizing the formation of LnZ/sup -/ have been calculated at 25.degree. and, these functions have been compared with the corresponding values of other lanthanide chelates with related chelating agents.
- 英文摘要: --
- 中文關鍵字: Formation constants; thermodynamic properties; EDDHA chelates of tripositive lanthanide ions; electrometric.
- 英文關鍵字: Formation constants; thermodynamic properties; EDDHA chelates of tripositive lanthanide ions; electrometric.