Anion binding consistency by influence of aromatic meta-disubstitution of a simple urea receptor: regular entrapment of hydrated halide and oxyanion clusters,CrystEngComm

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Anion binding consistency by influence of aromatic meta-disubstitution of a simple urea receptor: regular entrapment of hydrated halide and oxyanion clusters
CrystEngComm ( IF 2.6 ) Pub Date : 2017-08-22 00:00:00 , DOI: 10.1039/c7ce01155e
Utsab Manna _{1,

2,

3} , Gopal Das _{1,

2,

3}

Affiliation

An electron-withdrawing meta-disubstituted trifluoro-methyl terminal containing bis-urea receptor L derived from meta-phenylenediamine core is logically designed and synthesized for investigating its anion coordination activities. Receptor L has been recognized as a potential system for unusual asymmetric entrapment of naked sulphate anion along with R³₃(5)-type cyclic hydrated sulphate by one of the three symmetry-independent receptor moieties in a unit cell via hydrogen bonding-activated proton transfer from hydrogen sulphate. In addition, it is effective for fluoride-induced fixation of atmospheric CO₂ as an air-stable bicarbonate dimer, linear acetate–water polymeric assembly formation and chair-like (chloride)₂–(water)₂ assembly construction via H-bonding interactions of eight urea groups of four receptor units. Crystallographic results show that including DMF and DMSO-solvated free receptor structures, all halide and oxyanions noncovalently interact with urea groups of particular receptor moiety via noncooperative interactions irrespective of the anion dimension, which is possibly attributed to the aromatic meta-difunctionalization-driven steric effect of ligand architecture.

中文翻译：

阴离子结合稠度受简单尿素受体芳香族间二取代的影响：水合卤化物和氧阴离子簇的规则包埋

吸电子元二取代三氟甲基末端含双脲受体大号衍生自间苯二胺的核心逻辑设计和调查其阴离子协调活动合成。受体L被认为是潜在的系统，可通过氢键激活质子，通过单元格中的三个不依赖于对称性的受体之一，将裸硫酸根阴离子与R ³₃（5）型环状水合硫酸盐异常地不寻常地截留。从硫酸氢转移。另外，它对于氟化物诱导的大气中CO _2的固定是有效的。作为空气稳定的碳酸氢盐二聚体，通过四个受体单元的八个尿素基团的氢键相互作用，形成线性乙酸盐-水聚合物组装结构和椅子状（氯离子）_2-（水）₂组装结构。晶体学结果表明，包括DMF和DMSO溶剂化的游离受体结构，所有卤化物和氧阴离子均通过非合作性相互作用与特定受体部分的脲基团非共价相互作用，而与阴离子尺寸无关，这可能归因于芳香族间双功能化驱动的空间效应配体结构。

更新日期：2017-09-12

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