Cesium complex of an unsymmetrical calix[4]crown-dibenzocrown-6

Jong Seung Kim, Won Ku Lee, Soo Heon Lee, Jin Gyu Kim, Il Hwan Suh, Jong Yeol Kim, Jong Wan Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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 languageEnglish
Pages (from-to)183-187
Number of pages5
JournalJournal of Inclusion Phenomena
Issue number3
Publication statusPublished - 2001 Jul
Externally publishedYes

Bibliographical note

Funding Information:
This research was fully supported by a Grant by Korea Research Foundation (KRF-2000-015-DP0246).


  • Calix[4]-bis-crown
  • Calixarene
  • Complexation
  • Crown ether
  • Crystal structure

ASJC Scopus subject areas

  • Food Science
  • General Chemistry
  • Condensed Matter Physics


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