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Binding of carboxylatopillar[5]arene with alkyl and aryl ammonium salts in aqueous medium

机译：羧基钾[5]芳烃与烷基和芳基铵盐在水性介质中的结合

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摘要

The complex formation of alkyl ammonium salts by water-soluble carboxylatopillar[5] arene (CP5A) in aqueous medium is reported. p-Xylene diammonium salt and a series of secondary alkyl ammonium salts with various alkyl groups have been prepared and investigated for complex formation. All the ammonium salts exhibit strong host-guest complexation with CP5A under neutral aqueous conditions. H-1 NMR, H-1 DOSY and 2D NOESY NMR experiments have been performed to characterize these inclusion complexes. In this study, the hydrophobic and electrostatic interactions govern the complex formation leading to the formation of pseudorotaxane species. Five pseudo[2] rotaxanes and one pseudo[3] rotaxane were obtained whose association constant values and stoichiometry were evaluated by an NMR titration method. The results indicate the use of ammonium salts as new complimentary synthons for CP5A in aqueous medium, adding to the repertoire of existing recognition motifs such as paraquat and 1,4-bis(pyridinium) derivatives.
机译：报道了通过水溶性羧基盐[5]芳烃（CP5A）在水性介质中复杂形成烷基铵盐。已经制备了对二甲苯二铵盐和一系列具有各种烷基的二次烷基铵盐，并研究复杂地层。所有铵盐都表现出强烈的宿主 - 在中性水质条件下与CP5A络合。已经进行了H-1 NMR，H-1多剂和2D NOESY NMR实验以表征这些包含复合物。在该研究中，疏水性和静电相互作用控制了导致伪甲烷种类形成的复杂形成。通过NMR滴定法评价了五个假副[2]旋转烷基和一个伪[3]旋烷，其关联常数值和化学计量评价。结果表明，在水性介质中使用铵盐作为CP5a的新的互补合成，进入现有识别基序的曲目，如百草枯和1,4-双（吡啶鎓）衍生物。

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  • 来源
    《RSC Advances》 |2015年第104期|共8页
  • 作者

    Dasgupta Suvankar; Chowdhury Aniket; Mukherjee Partha Sarathi;

  • 作者单位

    Indian Inst Sci Dept Inorgan &

    Phys Chem Bangalore 560012 Karnataka India;

    Indian Inst Sci Dept Inorgan &

    Phys Chem Bangalore 560012 Karnataka India;

    Indian Inst Sci Dept Inorgan &

    Phys Chem Bangalore 560012 Karnataka India;

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  • 正文语种 eng
  • 中图分类 化学;
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