Effect of terminal substituents on self-assembly behavior of porphyrin molecules on Ag(110)

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• 作者：Xinli Leng ; Yan Lu ; Zhongping Wang ; Wei Li ; Xiaoqing Liu and Li Wang
• 刊名：Surface and Interface Analysis
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：49
• 期：2
• 页码：140-144
• 全文大小：1307K
• ISSN：1096-9918

文摘

Effect of terminal substituents on self-assembly behavior of porphyrin molecules has been studied with three derivatives modified with distinctly different substituents, 5,15-(di-3,5-di-tert-butylphenyl) porphyrin, 5,15-(dimesityl) porphyrin, and 5,15-(di-4-ethynylphenyl) porphyrin. Scanning tunneling microscopy and density functional calculations reveal that 5,15-(di-3,5-di-tert-butylphenyl) porphyrin, 5,15-(dimesityl) porphyrin, and 5,15-(di-4-ethynylphenyl) porphyrin spontaneously give different ordered structures on Ag(110) surface both at room temperature and after annealing. It is clear that the tert-butylphenyl substituent could increase the intermolecular van der Waals interactions to form stable network structure under condition of thermal activation, whereas the mesityl substituent plays an essential role in the formation of rigid chain structure as a result of the CH–π interactions between the mesityl groups of molecule enantiomers. Moreover, the ethynylphenyl substituent could induce metal atoms to coordinate with ethynyl to form organometallic chains. Copyright