Self-Assembly and External Modulation of a Flexible Porphyrin Derivative on Highly Oriented Pyrolytic Graphite

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• 作者：Jingfei Hou ; Hongliang Dai ; Zengqi Zhang ; Jun Li ; Xiaokang Li ; Ke Deng ; Qingdao Zeng
• 刊名：Langmuir
• 出版年：2017
• 出版时间：January 10, 2017
• 年：2017
• 卷：33
• 期：1
• 页码：400-406
• 全文大小：598K
• ISSN：1520-5827

文摘

With the aid of scanning tunneling microscopy, we have examined the two-dimensional hydrogen-bonded networks of carboxyl-functionalized porphyrin derivative H₂TCPp molecules at the heptanoic acid/HOPG interface. Moreover, we have successfully modulated the self-assembly structure of H₂TCPp by introducing 1,2-di(4-pyridyl)ethylene molecules into the assembled system. By performing density functional theory calculations, we also revealed the formation mechanisms of the different assemblies and the modulation process. Comparing the self-assembly structures at the liquid/solid interface with those in bulk crystals, we have obtained deep insight into the differences in H₂TCPp assemblies between 2D and 3D networks. Furthermore, this research is expected to deepen our understanding of on-surface phenomena and to provide a feasible process toward 2D assembly regulation.