title: Temperature-Triggered Chiral Self-Assembly of Achiral Molecules at the Liquid-Solid Interface.
abstract: 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 °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.
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST) , Beijing 100190, P. R. China.|Key Laboratory of Organo-pharmaceutical Chemistry, Gannan Normal University , Ganzhou 341000, P. R. China.
authors: Linxiu
authors: L
authors: Cheng
authors: Key Laboratory of Organo-pharmaceutical Chemistry, Gannan Normal University , Ganzhou 341000, P. R. China.
authors: Yibao
authors: Y
authors: Li
authors: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China.
authors: Chun-Yu
authors: CY
authors: Zhang
authors: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China.
authors: Zhong-Liang
authors: ZL
authors: Gong
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST) , Beijing 100190, P. R. China.
authors: Qiaojun
authors: Q
authors: Fang
authors: Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China.
authors: Yu-Wu
authors: YW
authors: Zhong
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST) , Beijing 100190, P. R. China.
authors: Bin
authors: B
authors: Tu
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST) , Beijing 100190, P. R. China.
authors: Qingdao
authors: Q
authors: Zeng
authors: CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology (NCNST) , Beijing 100190, P. R. China.
authors: Chen
authors: C
authors: Wang
keywords: achiral molecules; chiral self-assembly; flower-like structure; scanning tunneling microscopy; temperature-triggered