Supported liquid membrane for analytical separation of transition metal ions. Part I. Complexation properties of 1,10-didecyl-1,10-diaza-18-crown-6

✍ Scribed by N. Parthasarathy; J. Buffle

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 566 KB
• Volume: 254
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(91)90002-m

✦ Synopsis

Several physico-chemical parameters of l,lO-didecyl-l,lO-diaza-l&crown-6 (22DD Kryptofix) such as aqueous solubility, protonation and metal binding constants with Cu(II), important for the choice of this ligand as a carrier in a liquid membrane, were studied. The solubility of 22DD Kryptofix in water at 25 'C was found to be (2.7 f 0.1) x lo-' M at 25 o C. Aqueous 22DD solution has a UV absorbance band in the region of 198 nm. The effect of pH and alkali metal ions on the UV spectra is discussed. Protonation constants and the stability constant with C&I) were determined at 25 o C and at 0.1 M ionic strength by potentiometric titration using a glass electrode and a Cu(II) ion-selective electrode, respectively.