Abstract
An unsymmetrical calix[4]-bis-crown ether having both conventional crown-6 and dibenzocrown-6 rings in a fixed 1,3-alternate conformation was synthesized with good yield by the reaction of a monocyclic calix[4]crown-6 with dibenzodimesylate in the presence of cesium carbonate. The cesium ion selectivity among alkali metal ions increased compared to symmetrical calix[4]-bis-crown-6. The solid state structure of the ligand-cesium complex illustrates a 1:2 complex ratio. On the contrary, in solution, e.g., extraction equilibrium and 1 H NMR experiment gave a 1:1 complex ratio. From the result of the chemical shift change upon metal ion complex, the cesium ion seems to prefer the dibenzocrown loop to the conventional crown-6 ring.
| Original language | English |
|---|---|
| Pages (from-to) | 183-187 |
| Number of pages | 5 |
| Journal | Journal of Inclusion Phenomena |
| Volume | 40 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2001 Jul |
| Externally published | Yes |
Keywords
- Calix[4]-bis-crown
- Calixarene
- Complexation
- Crown ether
- Crystal structure
ASJC Scopus subject areas
- Food Science
- Chemistry(all)
- Condensed Matter Physics
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Kim, J. S., Lee, W. K., Lee, S. H., Kim, J. G., Suh, I. H., Kim, J. Y., & Kim, J. W. (2001). Cesium complex of an unsymmetrical calix[4]crown-dibenzocrown-6. Journal of Inclusion Phenomena, 40(3), 183-187. https://doi.org/10.1023/A:1011821612309