The inclusion of ethylammonium, N-methylpyridinium cations and native L-α-amino acids by the watersoluble pentasulfonatocalixarene 1 has been investigated at neutral pH by 1H NMR. The complexation behavior has been compared with that of the homologous tetrasulfonatocalixarene 2. Unlike host 2, host 1 exhibits high selectivity in the recognition of the investigated guests.
Keywords: Calixarenes, water-soluble, molecular recognition, H NMR titration
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