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首页> 外文期刊>Chemistry: A European journal >Stepwise encapsulation of sulfate ions by ferrocenyl-functionalized tripodal hexaurea receptors
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Stepwise encapsulation of sulfate ions by ferrocenyl-functionalized tripodal hexaurea receptors

机译：二茂铁基官能化的三脚架六脲受体逐步包封硫酸根离子

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摘要

Three ferrocenyl-functionalized tripodal hexaurea anion receptors with ortho- (L~2), meta- (L~3), and para-phenylene (L ~4) bridges, which showed strong binding affinities toward sulfate ions, have been designed and synthesized. In particular, meta-phenylene-bridged ligand L~3, owing to its trigonal bipyramidal structure, can encapsulate two SO_4 ~(2-) ions in its "inner" and "outer" tripodal clefts, respectively, as supported by their clearly distinct NMR resonances and by molecular modeling. The sulfate complex of ortho-ligand L~2, (TBA)_2[SO_4a? L~2]×2 H_2O (1), displays a caged tetrahedral structure with an encapsulated sulfate ion that is hydrogen bonded by the six urea groups of ligand L~2. CV studies showed two types of electrochemical response of the ferrocene/ferrocenium redox couple upon anion binding, that is, a shift of the wave and the appearance of a new peak. Quantitative binding data were obtained from the NMR and CV titrations. The time capsule: Three ferrocenyl-functionalized tripodal hexaurea anion receptors were designed for sulfate recognition. Owing to its trigonal-bipyramidal shape, a meta-phenylene-bridged ligand can encapsulate two SO_4 ~(2-) ions in two distinct steps. CV studies showed two types of electrochemical response of the Fc/Fc~+ redox couple upon anion binding, that is, a shift of the wave and the appearance of a new peak.
机译：设计并合成了三个具有邻-（L〜2），间-（L〜3）和对亚苯基（L〜4）桥的二茂铁基官能化的三脚架六脲阴离子受体，这些受体对硫酸根离子具有很强的结合亲和力。 。尤其是，间亚苯基桥接的配体L〜3，由于其三角双锥体结构，可以在其“内部”和“外部”三脚架裂隙中分别包封两个SO_4〜（2-）离子，这得到了它们明显不同的支持。 NMR共振和分子建模。邻配体L〜2（TBA）_2 [SO_4a？]的硫酸盐配合物。 L〜2]×2 H_2O（1）呈现出笼状四面体结构，具有包裹的硫酸根离子，该硫酸根离子通过配体L〜2的六个脲基氢键合。 CV研究表明，二茂铁/二茂铁氧化还原对基于阴离子键的两种电化学反应，即波的移动和新峰的出现。从NMR和CV滴定获得定量结合数据。时间胶囊：为硫酸盐识别设计了三个二茂铁基官能化的三脚架六脲阴离子受体。由于其三角双锥体的形状，间亚苯基桥接的配体可以在两个不同的步骤中封装两个SO_4〜（2-）离子。 CV研究表明，Fc / Fc〜+氧化还原对基于阴离子结合的两种电化学反应，即波的移动和新峰的出现。

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