Journal of the American Chemical Society · 2003 · 53 citations · 23 references
Natural SciencesChemistryMaterials ScienceAnalytical ChemistryPhysical ChemistrySurface ScienceAtomic Force MicroscopyBiomolecular InteractionsCoordination ChemistryIntermolecular ForcesIntermolecular InteractionsMolecular InteractionsAtomic Force Microscopy AnalysisChemical Force MicroscopyComplexation InteractionsSpecific ForceTip-sample Interactions
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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Functional Group Imaging by Chemical Force Microscopy
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