- 作者: 許東明 ; 劉凱莉
- 作者服務機構: 台灣大學化學系
- 中文摘要: The acid dissociation constants of 1,2-bis(o-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid(H/sub 4/BAPAT or H/sub 4/Z), and the stability constants of its chelates with tripositive rare-earth metal ions have been determined by the potentiometric titration and mercury indicator electrode methods at 15.degree., 25.degree. and 35.degree.C and an ionic strength of 0.1 (KNO/sub 3/). The existence of a monohydrogen chelate species, LnHZ, and the normal chelate, LnZ/sup -/, is illustrated. Enthalpy and entropy changes characterizing the formation of the normal chelates and the dissociation of the last two protons of chelating acid have been calculated at 25.degree.C. These functions have been compared with corresponding values for related chelating agents.
- 英文摘要: --
- 中文關鍵字: Dissociation Constant; Formation Constant; Thermodynamic Property; Lanthanide(Iii)-Bapta Chelate; Lanthanide(Iii) Complex
- 英文關鍵字: 游離常數;形成常數;熱力學性質;鑭(III)錯化合物;螯狀物;鉗合物