| Autor: |
Marchand, A.P., Hazlewood, A., Huang, Z., Kumar Vadlakonda, S., Rocha, J.-D., Power, T.D., Mlinarić-Majerski, Kata, Klaić, Lada, Kragol, Goran, Bryan, J.C. |
| Jazyk: |
angličtina |
| Rok vydání: |
2003 |
| Předmět: |
|
| Popis: |
Bis-cage-annulated 18-crown-6 and 20-crown-6 macrocyclic ethers (i.e., 1 and 2, respectively) have been synthesized, and their alkali metal picrate extraction profiles have been determined. Host system 1 proved to be a significantly more avid alkali metal cation complexant than 2 and somewhat more avid than 18-crown-6. Both 1 and 18-crown-6 display modest selectivity toward K+ and Rb+. A stable host-guest complex was prepared by slow evaporation of a CH2Cl2-hexane solution of an equimolar mixture of 2 and potassium picrate. The X-ray crystal structure of this complex reveals that picrate anion functions as a bidentate ligand therein. The gas-phase interaction energy between the 2 . K-\ complex and picrate anion was calculated to be ca. -64.9 kcal mol(1), thereby indicating that participation of picrate anion as an additional bidentate ligand results in significant stabilization of complex 10. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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