Self-Assembly of Organic Molecules with π-π Interactions on Gold Surfaces
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摘要: 为了研究存在π-π堆叠对自组装结构的调控行为，本文利用超高真空扫描隧道显微镜研究了4，6，-二氯-2，5，-联苯嘧啶（DCDPP）分子在Au （111）上的自组装行为。DCDPP分子中旋转的5-苯环使分子中间能够存在π-π相互作用。在π堆叠，氢键等多种分子相互作用的竞争下，低覆盖度时，DCDPP在Au （111）上会形成一种链状结构和一种二维有序结构。而高覆盖度下，DCDPP将通过更高密度的自组装结构来克服高覆盖度带来的应力。这种由于不同分子间作用力和覆盖度导致不同的自主装结构的研究，对于有机电子器件的制备具有指导意义。Abstract: The self-assembly behavior of 4,6,-dichloro-2,5,and-biphenyl pyrimidine(DCDPP) molecules on Au(111) surface was investigated with ultra-high vacuum scanning tunneling microscope for manipulation of self-assembly structure via π-π interaction.The influence of the DCDPP molecular coverage on the self-assembly nano-structures was experimentally measured and theoretically analyzed.The preliminary results show that the molecular coverage made the difference.For instance, the rotating 5-benzene ring in DCDPP molecule was responsible for the π-π interactions; a low coverage of DCDPP molecule self-assembled into stable chains and well-ordered 2 D structures; a higher coverage self-assembled into different high density 2 D islands, possibly because of the localized stress.We suggest that the results be of some basic and technological interest in development of molecular electronic devices.
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Keywords:
- Surface chemistry /
- STM /
- Self-assemble /
- π /
- -π /
- interaction
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