Potassium Sensing Calix[4]arene Crown Ethers |
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| Authors: | 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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| Institution: | aDepartment of Chemistry, Konyang University, Nonsan, 320-711, Korea;bKorea Ginseng and Tobacco Research Institute, Taejon, 305-345, Korea;cDepartment of Chemistry, Changwon National University, Changwon, 641-773, Korea;dKorea Atomic Energy Research Institute, Taejon, 305-600, Korea |
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| Abstract: | 1,3-Alternate calix4]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 calix4]arene biscrown-5 (2), in which two crown cavities connect to the calix4]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 (logKa) for 1 and 2 were determined to give 2.51 and 3.49, respectively. |
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