Proton-Assisted Self-Assemblies of Linear Di-Pyridyl Polyaromatic Molecules at Solid/Liquid Interface

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• 作者：Heng Li ; Xiaoguang Xu ; Jian Shang ; Jianlong Li ; Xinquan Hu ; Boon K. Teo ; Kai Wu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 18, 2012
• 年：2012
• 卷：116
• 期：41
• 页码：21753-21761
• 全文大小：643K
• 年卷期：v.116,no.41(October 18, 2012)
• ISSN：1932-7455

文摘

Proton-assisted self-assemblies of three linear dipyridyl polyaromatic molecules, namely, 4,4鈥?bipyridine, 1,4-di(4-pyridyl)benzene, and 4,4鈥?di(4-pyridyl)biphenyl, at the heptanoic acid/highly oriented pyrolytic graphite interface were systematically studied with scanning tunneling microscopy. A major finding was that protons from strong acids could greatly accelerate the assembling processes of 4,4鈥?bipyridine and 1,4-di(4-pyridyl)benzene molecules and, in the case of 4,4鈥?di(4-pyridyl)biphenyl molecule, lead to structural transformation in the self-assembling process in analogy to the role of a catalyst in a catalytic process. The experimental results could be rationalized by a simple mechanism involving proton-assisted formation of intermolecular hydrogen bonds, which provides new insights with regards to the self-assembling processes in solutions, especially under acidic bioenvironments.