- 作者: 詹益松 ; 施正雄
- 作者服務機構: 台灣師範大學化學系
- 中文摘要: Alkyl-substituted sym-dibenzo-16-crown-5-oxyacetic acid and sym-dibenzo-16-crown-5-oxydodecanic acid were synthesized and applied as ion transport carriers in liquid and film membranes. Increasing crown-ether lipophilicity decreased acid dissociation constants and solubilities of crown-ether carboxylic acids in water but enhanced the solubility and transport ability of the carboxylic anion- K/sup +/ complex through a liquid organic (CH/sub 2/ Cl/sub 2/) membrane. Transport phenomena of the cations alkali-metal ions, alkaline-earth metal ions and transition- metal ions through liquid membranes based on these crown- ether carriers were investigated. Effects of anions, crown- ethers and pH on ion transport are discussed. A mechanism of ion transport through a crown-ether membrane is proposed to include [ OH/sup -/ ] and [ H/sup +/ ] in both source and target layers. Ion transport through a polymer/crown- ether film membrane was more efficient than through a liquid membrane.
- 英文摘要: --
- 中文關鍵字: Crown-Ether Carboxylate; Lipophilicity; Metal Cation; Ion Transport; Ph Value
- 英文關鍵字: 冠醚羧酸;親脂性;金屬陽離子;離子傳輸;pH值