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

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23 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

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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    Kim, J. S., Lee, W. K., Ra, D. Y., Lee, Y. I., Choi, W. K., Lee, K. W., & Oh, W. Z. (1998). Potassium Sensing Calix[4]arene Crown Ethers. Microchemical Journal, 59(3), 464-471. https://doi.org/10.1006/mchj.1998.1630