- 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 titanyl(II) chelates of ethylenediamineteraacetic acid (EDTA, H/sub 4/X), glycoletherdiaminetetraacetic acid (GEDTA, H/sub 4/Y), trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid (DCTA, H/sub 4/L) and diethylenetriaminepentaacetic acid (DTPA, H/sub 5/Q) were investigated in aqueous solution by a mercury indicator electrode technique. The titanyl(II) ion forms (1:1) chelates with EDTA, GEDTA, DCTA and DTPA which are stable in acidic solution but undergo hydrolysis above pH 6 releasing the free ligand. The stability constants (log K) of the chelates TiOX/sup 2-/,TiOY/sup 2-/, TiOL/sup 2-/ and TiOQ/sup 3-/ have been evaluated at 5.degree., 15.degree., 25.degree. and 35.degree. and at an ionic strength of 0.10 (KNO/sub 3/). Enthapy and entropy changes characterizing the formation of the chelates have been calculated at 25.degree..
- 英文摘要: --
- 中文關鍵字: Titanyl(II) chelates of EDTA; GEDTA; DCTA and DTPA.
- 英文關鍵字: Titanyl(II) chelates of EDTA; GEDTA; DCTA and DTPA.