Metal ion complexation by ionizable crown ethers
During the report period a variety of new lipophilic ionizable crown ethers with pendent proton-ionizable groups has been synthesized. In addition a series of proton-ionizable crown ethers without lipophilic groups was prepared to study how structural variations within the ligand influence metal ion complexation in homogeneous media as assessed by NMR spectroscopy or titration calorimetry. A third class of new metal ion-complexing agents is a series of lipophilic acyclic polyether dicarboxylic acids. Competitive solvent extractions of alkali metal and alkaline earth cations and of the mixed species have been conducted to reveal the influence of ring size, nature and attachment site of the lipophilic group, sidearm length, and proton-ionizable group identity and location upon the selectivity and efficiency of metal ion complexation. In addition to such studies of structural variation within the lipophilic proton-ionizable crown ether, the effect of changing the organic solvent and variation of the stripping conditions have been assessed. The ability of proton- ionizable crown ethers to function as selective metal ion carriers in liquid membrane transport processes has been examined in both bulk liquid membrane and polymer-supported liquid membrane transport systems. New acyclic and cyclic polyether carboxylic acid resins have been prepared by condensation polymerization and characterized.
- Research Organization:
- Texas Tech Univ., Lubbock, TX (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG05-88ER13832
- OSTI ID:
- 6737356
- Report Number(s):
- DOE/ER/13832-12; ON: DE90013956
- Country of Publication:
- United States
- Language:
- English
Similar Records
Metal ion complexation by ionizable crown ethers. Progress report, January 1, 1991--December 31, 1993
Metal ion complexation by ionizable crown ethers: Progress report, January 1, 1985-December 31, 1987
Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKALI METALS
ALKALINE EARTH METALS
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHELATING AGENTS
CHEMICAL REACTIONS
COMPLEXES
DOCUMENT TYPES
ELEMENTS
ETHERS
EXTRACTION
IONS
LIGANDS
MEMBRANES
METALS
MOLECULAR STRUCTURE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
PROGRESS REPORT
RESINS
SEPARATION PROCESSES
SOLVENT EXTRACTION
SYNTHESIS