首页> 外文期刊>Chemistry: A European journal >Interplay of p-Sulfonatocalix[4]arene and Crown Ethers En Route to Molecular Capsules and 'Russian Dolls'
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Interplay of p-Sulfonatocalix[4]arene and Crown Ethers En Route to Molecular Capsules and 'Russian Dolls'

机译:p-Sulfonatocalix [4]芳烃与冠醚在分子胶囊和“俄罗斯娃娃”中的相互作用

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Diffusion-ordered ~1H NMR spectroscopy techniques have been used to determine the binding strength of p-sulfonatocalix[4]arene(SO_3[4])towards a number of charged crown ether species in aqueous conditions.For several(doubly)charged(di)aza-crown ethers,all were bound by SO_3[4] either well or very well with binding constants between 5.1x10~2-9.9x 10~5 M~(-1).These results correlate with,and thus explain the phenomenon of rapid capture of azacrown ethers in molecular capsules based on p-sulfona-tocalix[4]arene and lanthanide metals.Similarly,the formation of "Russian doll" superanions in the solution phase is also elucidated.These superanions have been shown to selectively crystallise particular polynuclear aquated metal ions from mixtures in the aqueous phase.Neutral[18]crown-6 is not bound by p-sulfonatocalix[4]arene and displays a binding constant of O_M~(-1).When sodium[18]crown-6 is examined in a similar fashion,binding by SO_3[4] is observed in solution with k_a approx 3.1 x 10~3M~(-1).
机译:扩散有序的〜1H NMR光谱技术已被用于测定对苯磺酸钠杯[4]芳烃(SO_3 [4])对水性条件下许多带电冠醚物种的结合强度。氮杂冠醚,都被SO_3 [4]很好地或很好地结合,结合常数在5.1x10〜2-9.9x 10〜5 M〜(-1)之间。这些结果相互关联,因此可以解释这种现象。对磺化tocalix [4]芳烃和镧系金属的分子胶囊中氮杂冠醚的快速捕获的方法。类似地,也阐明了溶液相中“俄罗斯娃娃”超阴离子的形成。这些超阴离子已显示出选择性地结晶水相混合物中的特定多核水合金属离子。中性[18]皇冠-6不被对-磺基对杯[4]芳烃键合,并且显示出O_M〜(-1)的结合常数。当钠[18]皇冠-以类似的方式检查图6,在k_a约为3.1 x 10〜3M〜的溶液中观察到SO_3 [4]的结合(-1)。

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