Potassium Sensing Calix[4]arene Crown Ethers

Jong Seung Kim, Won Ku Lee, Do Young Ra, Yong Ill Lee, Wang Kyu Choi, Kune Woo Lee, Won Zin Oh

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


1,3-Alternate calix[4]arene crown-5 (1) and corresponding biscrown-5 (2) were synthesized and the complexation behavior with alkali metal ions examined. For both 1 and 2, potassium ion was selectively extracted from aqueous phase into organic phase over other alkali metal ions based on two phase extraction experiment. The complexation ratio between calix[4]arene biscrown-5 (2), in which two crown cavities connect to the calix[4]arene framework by 1,3-alternate fashion and potassium metal ion is found to 1:1 by proton NMR spectroscopy and extraction equilibria. Association constants (log Ka) for 1 and 2 were determined to give 2.51 and 3.49, respectively.

Original languageEnglish
Pages (from-to)464-471
Number of pages8
JournalMicrochemical Journal
Issue number3
Publication statusPublished - 1998 Jul
Externally publishedYes

Bibliographical note

Funding Information:
This research was fully supported by the Korea Atomic Energy Research Institute in Taejon, Korea.

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy


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