CHED 1570 |
| Anion binding process which involves non-covalent interactions, namely electrostatic and hydrogen bonding between a receptor and a negatively charged species, constitute a major challenge as compared to the cation binding. A great effort has been made over last 35 years in achieving highly selective synthetic receptors for anions. [1-2]. Polyazamacrocycles are widely used to serve as anion receptors that include polyamines, quaternary ammonium ions, and amide based compounds. Polyamines usually show high binding affinity for an anion, however they are dependent on pH, and the binding of anion is progressed under acidic conditions. On the other hand, amides and quaternary ammonium salts are pH independent receptors in which an anion is coordinated through hydrogen bonding and/or electrostatic interactions. Among the various anions, halides represent one of the most successful series that have been widely investigated with various types of synthetic receptors. This talk will highlight the binding and structural aspects of halide complexes with synthetic polazamacrocyclic receptors. References (1) Bianchi, A.; Bowman-James, K.; García-España, E., Eds. Supramolecular Chemistry of Anions, Wiley-VCH: New York, 1997. (2) Kang, S. O.; Hossain, M. A.; Bowman-James, K, “Influence of dimensionality and charge on anion binding in amide-based macrocyclic receptors” Coord. Chem. Rev. 2006, 3038-3052. |
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Research and Education in Material Science
8:00 AM-11:25 AM, Thursday, April 10, 2008 Hilton New Orleans Riverside -- HEC B, Oral
Division of Chemical Education |