Highly selective copper(II) ion receptors: tetraazacrown ethers bearing two 8-hydroxyquinoline side arms
| Autor: | Erik G. Nelson, Sang Chul Lee, Reed M. Izatt, Jerald S. Bradshaw, John D. Lamb, Xian X. Zhang, Paul B. Savage |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Aqueous solution
Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element 8-Hydroxyquinoline Buffer solution Copper Inorganic Chemistry chemistry.chemical_compound Membrane chemistry Materials Chemistry Qualitative inorganic analysis Physical and Theoretical Chemistry Equilibrium constant |
| Zdroj: | Inorganica Chimica Acta. 317:174-180 |
| ISSN: | 0020-1693 |
| DOI: | 10.1016/s0164-1212(00)00110-2 |
| Popis: | Four 8-hydroxyquinoline-containing tetraazacrown ethers were studied for their potential application as highly selective Cu 2+ receptors. Equilibrium constants for complexation of these tetraazacrown ethers with H + , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ , and Pb 2+ were determined in aqueous solution at 25°C by potentiometry. The most stable complexes were formed with Cu 2+ . The UV–Vis spectra of two of the ligands were studied in the presence and absence of the metal ions. The Cu 2+ complexes exhibited unique absorption peaks at 655 nm in aqueous acetic acid buffer solution (pH 4.76). Thus, these systems demonstrated copper(II) ion selectivity. Three of the ligands showed both 1:1 and 1:2 complexation with Cu 2+ (L:Cu 2+ ). In competitive transport experiments using bulk liquid membranes, Cu 2+ was transported selectively from a mixture containing all of the above metal ions. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect