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The lower rim functionalized homotrioxacalix[3]arene 4a and 4b were synthesized from triol 1 by a stepwise reaction. Extraction data for metal and ammonium picrates from water into dichloromethane are... discussed Due to the strong intramolecular hydrogen bonding between the neighboring NH and CO groups, their affinities as an ionophore to metal cations decreased cone-4a shows single selectivity to n-BuNH_3^+ while partial-cone-4a almost has no affinity to cations. cone-4b has high selectivity and affinity to Ag^+ cation. The complex mode of cone-4a with n-BuNH_3Cl wd cone-4b with Ag^+ was demonstrated by ^1H NMR titration in CDCl_3, respectively. A good Job plot proves 1:1 coordination of cone-4b with Ag^+ cation.続きを見る
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Mendeley出力
KJ00004507840