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Abstract
The interest in synthesizing conjugated nanobelts and nanocones has increased recently. Although a number of various struc-tures has been achieved, almost none has additional functional groups at the peripheral rims. Based on a calix[4]arene, a func-tionalized calix[4]nanocone was synthesized. Due to its rigid structures in combination with methoxy groups on both the upper and the lower rim, the nanocone was tested for the binding of alkaline ions in solution by NMR measurements. The nanocone shows an high selectivity for binding Na+ in favor of Li+ and also K+ in CDCl3. By comparing nanocone with a related but structurally flexible methoxy calix[4]arene, the impact on structural rigidity on selectivity is clearly demonstrated.
Supplementary materials
Title
Supporting Information
Description
The Supporting Information is available free of charge at http://pubs.acs.org.” including the synthetic procedures and the full characterization (1H, 13C and 2D NMR spectra of all new compounds, computational details and X-ray crystal structure data of compounds 3, 5, 6, 7, 8, 12, 13, 14, 15, 16, 17 and NMR titration data.
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