Temperature-Triggered Chiral Self-Assembly of Achiral Molecules at the Liquid-Solid Interface
Temperature-Triggered Chiral Self-Assembly of Achiral Molecules at the Liquid-Solid Interface
复制标题
液-固界面处温度触发非手性分子的手性自组装
DOI：
10.1021/acsami.6b10883
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发表时间：
2016-11-23
影响因子：
9.5
通讯作者：
Wang, Chen
中科院分区：
文献类型：
--
作者：
Cheng, Linxiu;Li, Yibao;Wang, Chen
通过扫描隧道显微镜在二维 (2D) 表面上研究了温度触发的手性纳米结构。非手性分子 1 和 2 在加热前倾向于在石墨上自组装成带状结构。然而，当加热到一定温度时，会观察到R和S花状结构。 1系统和2系统的转变温度分别为55℃和60℃。密度泛函理论计算表明R和S花状结构比条状结构更稳定。花状结构和条状结构的共存证明了热力学平衡。此外，当在其他条件保持不变的情况下将手性溶剂添加到样品中时，外消旋现象消失并出现纯手性。这是控制二维分子组装体手性的有效方法。
Temperature triggered chiral nanostructures have been investigated on two-dimensional (2D) surfaces by means of scanning tunneling microscopy. Achiral molecules 1 and 2 tend to self-assemble into strip structures on graphite before heating. However, R and S flower-like structures are observed when heated to certain temperature. The transition temperatures of 1 and 2 systems are 55 and 60 degrees C, respectively. The density functional theory calculations demonstrate that R and S flower-like structures are more stable than strip structures. The coexistence of flower-like structures and strip structures demonstrates the thermodynamic equilibrium. Further, when chiral solvent is added to the sample with other conditions remaining the same, the racemic phenomenon disappears and homochirality emerges. This is an efficient method to control the chirality of 2D molecular assemblies.