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首页> 外文期刊>Crystal growth & design >Terminal Substituent Induced Differential Anion Coordination and Self-Assembly: Case Study of Flexible Linear Bis-Urea Receptors
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Terminal Substituent Induced Differential Anion Coordination and Self-Assembly: Case Study of Flexible Linear Bis-Urea Receptors

机译：末端取代基诱导的差分阴离子协调和自组装：柔性线性双脲受体的情况研究

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摘要

For a comprehensive analysis of host-guest binding propensity in their neutral form, three linear flexible bis-rea receptors (L-1-L-3) with different terminal substituents have been synthesized. It has been established that, with the existence of electron-withdrawing or pi-acidic phenyl substituents, they act as a possible system that can proficiently coordinate with anions of diverse dimensions constantly initiated by the size of the countercations. The 3,5-bis(trifluoromethyl)phenyl-derived isomer (L-1) can readily form cooperative neutral self-assemblies irrespective of the size the monovalent halides (viz. chloride, bromide, and iodide anions) and noncooperative neutral self assemblies with planar divalent carbonate anion. The meta isomer L-2 captures spherical halides, i.e. chloride and bromide, in an isostructural way, forming a 1:2 host-guest assembly, whereas the isomeric para receptor L-3 shows cooperative binding with chloride anions, having coordination number 3. However, due to the greater flexibility and lesser hydrophobicity of receptor L-2 and L-3 in comparison to receptor L-1, successful crystallization of any oxyanion complexes through the meta and para isomers was not successful.
机译：为了综合分析其中性形式的宿主访客结合倾向，已经合成了具有不同末端取代基的三个线性柔性双-REA受体（L-1-L-3）。已经确定，随着所吸附或Pi-酸性苯基取代基的存在，它们作为可以熟练地与不同尺寸的阴离子掌握的可能系统，不断由反应的尺寸引发。 3,5-双（三氟甲基）苯基衍生的异构体（L-1）可以容易地形成合作中性自组装，无论单价卤化物（氯化物，溴化物和碘化物阴离子）和非合作中性自组装平面二价碳酸盐阴离子。 Meta异构体L-2以Isostrontuck的方式捕获球形卤化物，即氯化物和溴化物，形成1：2的宿主组件，而异构体对受体L-3显示与氯阴离子的协同结合，具有配位3。然而，由于受体L-1的受体L-2和L-3的较高的灵活性和较小的疏水性，通过Meta和Para异构体的任何氧基复合物的成功结晶不成功。

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  • 来源
    《Crystal growth & design》 |2019年第4期|共10页
  • 作者

    Nayak Biswajit; Halder Senjuti; Das Gopal;

  • 作者单位

    Indian Inst Technol Guwahati Dept Chem Gauhati 781039 Assam India;

    Indian Inst Technol Guwahati Dept Chem Gauhati 781039 Assam India;

    Indian Inst Technol Guwahati Dept Chem Gauhati 781039 Assam India;

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  • 正文语种 eng
  • 中图分类 晶体学;
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