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首页> 外文期刊>Chemistry: A European journal >Zinc-Coordinated Hierarchical Organization of Ligand-Stabilized Gold Nanoclusters for Chiral Recognition and Separation
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Zinc-Coordinated Hierarchical Organization of Ligand-Stabilized Gold Nanoclusters for Chiral Recognition and Separation

机译：锌协调配体稳定的金纳米纳米能器的层次组织，用于手性识别和分离

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摘要

Three-dimensional organization of d-or l-tryptophan and mercaptopropionic acid-stabilized gold nanoclusters has been achieved by complexation of ligands using zinc ions. Powder X-ray diffraction and transmission electron microscopy analyses substantiated the crystalline nature of the assembly of atomic nanoclusters. The hierarchical arrangement of the nanoclusters exhibited superior optical properties (namely, enhanced photoluminescence and excited-state lifetime) as compared to the non-assembled nanoclusters. Furthermore, photoluminescence of the crystalline assembly of nanoclusters served as a visual marker for chiral recognition of d and l enantiomers of tryptophan, with subsequent separation of the corresponding enantiomer. A theoretical structure based on various experimental observations has also been proposed herein. The mechanistic aspect of the chiral separation is proposed to have occurred through attachment of d or l-tryptophan to the coordinatively unsaturated zinc ions, thus forming super complexes. The degree of stabilization of the super complexes is dictated by a "three-point versus two-point" interaction between the enantiomers and the chiral selector.
机译：通过使用锌离子的配体络合通过配体的络合来实现D-或L-色氨酸和巯基丙烷酸稳定的金纳细胞蛋白的三维组织。粉末X射线衍射和透射电子显微镜分析证实了原子纳米能器组件的结晶性质。与未组装的纳米能器相比，纳米能器的分层布置表现出优异的光学性质（即，增强的光致发光和激发 - 状态寿命）。此外，纳米能器的结晶组件的光致发光用作色氨酸的D和L对映体的手性识别的视觉标记，随后分离相应的对映体。本文还提出了基于各种实验观察的理论结构。提出了通过将D或L-色氨酸连接到协调不饱和锌离子的机械分离的机械方面，从而形成超复合物。超复合物的稳定度被对映体和手性选择器之间的“三点与两点”相互作用决定。

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