Discrimination between Conglomerates and Pseudoracemates Using Surface Coverage Plots in 2D Self-Assemblies at the Liquid-Graphite Interface

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• 作者：Naoki Maeda ; Dr. Takashi Hirose and Prof. Kenji Matsuda
• 刊名：Angewandte Chemie International Edition
• 出版年：2017
• 出版时间：February 20, 2017
• 年：2017
• 卷：56
• 期：9
• 页码：2371-2375
• 全文大小：2976K
• ISSN：1521-3773

文摘

The two-dimensional (2D) molecular ordering of two photochromic diarylethenes was investigated using scanning tunneling microscopy at the liquid–graphite interface. The racemic mixture of the closed-ring isomer of one of the diarylethenes showed spontaneous separation of its enantiomers upon 2D crystallization, whereas that of the other diarylethene formed a pseudoracemic crystal in which two enantiomers coexist in a 2D ordering domain. The mixing of enantiomers in 2D assemblies can be analyzed by the dependence of the surface coverage on the concentration of enantiomers at different enantiomeric ratios.