Abstract
Water-soluble aminocalix[4]arene hosts, the one with hydrophilic function and the other with hydrophobic function on the top of the deep hydrophobic cavity representing hydrophobic mouth and hydrophilic mouth, respectively. We report the new water-soluble aminocalix[4]arene hosts 1 and 2 with deep hydrophobic cavity facilitating hydrophobic mouth and hydrophilic mouth, respectively. The 1 H NMR titrations revealed that host 1 shows high selectivity for neutral guests 9 and 10 , with log K of 4.2 and 4.6, respectively. The host 2 shows log K of 4.9 for binding with guest 15 . Moreover, the binding ability of the host 2 for guest 14 is stronger by a factor of 1000 than that of the host 1 .
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