Molecular Multistate Systems Formed in Two-Dimensional Porous Networks on Ag(111)

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• 作者：Kyung-Hoon Chung ; Howon Kim ; Won Jun Jang ; Jong Keon Yoon ; Se-Jong Kahng ; Jhinhwan Lee ; Seungwu Han
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 10, 2013
• 年：2013
• 卷：117
• 期：1
• 页码：302-306
• 全文大小：408K
• 年卷期：v.117,no.1(January 10, 2013)
• ISSN：1932-7455

文摘

Host鈥揼uest interactions in porous supramolecular structures have been studied on surfaces using scanning tunneling microscopy, with anticipation of biochemical and sensor applications, but limited to cases of van der Waals interactions and hydrogen bonds. Here, we studied the intermolecular structures of 4,4鈥?dibromo-p-terphenyl molecules self-caged in porous supramolecular structures with halogen bonds on Ag(111). The caged molecules hopped among six different configurations at higher than 50 K, showing a propeller-like pattern. At 30 K, they stayed at one of six states that were stabilized with Br路路路Br halogen bonds and Br路路路H hydrogen bonds with energy gains of 225, 197, and 163 meV, as revealed by our density functional theory calculations. The self-caged structure provides a model system to simulate multistate supramolecular memories.