Ion pair cooperative binding of potassium salts by new rhenium(I) bipyridine crown ether receptors
| Autor: | James E. Redman, Simon W. Dent, Paul D. Beer, Michael G. B. Drew, Lindsay H. Uppadine |
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| Rok vydání: | 2001 |
| Předmět: |
Anions
Magnetic Resonance Spectroscopy Potassium Inorganic chemistry chemistry.chemical_element Acetates Spectrometry Mass Fast Atom Bombardment Crystallography X-Ray Potassium Chloride Inorganic Chemistry Bipyridine chemistry.chemical_compound 2 2'-Dipyridyl Ethers Cyclic Amide Polymer chemistry Organometallic Compounds Physical and Theoretical Chemistry Anion binding Crown ether chemistry.chemical_classification Cooperative binding Nuclear magnetic resonance spectroscopy Rhenium Cations Monovalent chemistry |
| Zdroj: | Inorganic chemistry. 40(12) |
| ISSN: | 0020-1669 |
| Popis: | The new rhenium(I) bipyridine crown ether receptors 1-4 have been prepared and their ion pair recognition properties examined. The crystal structure of [1.KCl](2).2H(2)O demonstrates that potassium is coordinated by benzo-18-crown-6 and chloride is hydrogen bonded to the amide groups. Receptor 3 extracts solid KCl and KOAc into chloroform via ion pair complexation. NMR and emission titration studies with receptors 1-4 and KCl/KOAc show that cobound potassium enhances anion binding strength by electrostatic and conformational effects. Significant cooperative interactions are observed between the anion and cation sites for host 4 in CH(3)CN. This molecule coordinates potassium to form a 1:1 intramolecular sandwich complex, which preorganizes the host for acetate binding. |
| Databáze: | OpenAIRE |
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