Single complexation force of 18-crown-6 with ammonium ion evaluated by atomic force microscopy |
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Authors: | Kado Shinpei Kimura Keiichi |
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Institution: | Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, Sakae-dani, Wakayama 640-8510, Japan. |
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Abstract: | The cation complexation force of 18-crown-6 has been measured in ethanol by means of atomic force microscopy using probe tips and mica substrates modified chemically with 18-crown-6 and ammonium ion, respectively. The specific complexation force was suppressed by free potassium ion in the measurement solution, indicating a blocking effect based on the competitive complexation of the 18-crown-6 moiety between the free ion and the ammonium ion bound to the substrate. The single complexation force of 18-crown-6 with ammonium ion was evaluated to be about 60 pN in ethanol by autocorrelation analyses of the histograms for observed forces. |
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