表面化学反应诱导的超分子结构研究

发布时间：2018-06-29 04:20

本文选题：扫描隧道显微镜 + 表面化学反应　；参考：《南昌大学》2015年硕士论文

【摘要】：利用室温超高真空扫描隧道显微镜系统地研究了铜原子诱导的5,15-二苯基卟啉分子在金(111)表面上的金属化过程。通过控制铜原子和5,15-二苯基卟啉分子在金表面上的沉积顺序,在分子水平上观测铜原子进入5,15-二苯基卟啉分子内部的途径,即为无论铜原子先于5,15-二苯基卟啉分子沉积在样品表面上或是后于5,15-二苯基卟啉分子沉积在样品表面上,铜原子在室温下都倾向于在5,15-二苯基卟啉分子自组装层下形成晶态岛,并在外界给予足够的激发能量时,铜原子会从5,15-二苯基卟啉分子底部进入分子内发生金属化反应。同时利用室温下和液氮温度下运行的超高真空扫描隧道显微镜研究了5,15-二苯基卟啉分子在Ag(110)上的自组织行为,利用其分子间所发生的脱氢环化反应构建共轭分子链。结果表明,5,15-二苯基卟啉分子在Ag(110)表面上的自组装行为和分子链成链方向都受到来自银基底的晶格调制作用。液氮温度下的实验结果表明,银表面参与催化了5,15-二苯基卟啉分子间的脱氢环化反应,且未成链分子的带隙相较于成链分子的带隙要窄。利用室温超高真空扫描隧道显微镜系统观测,研究了表面环加成反应诱导的非手性4-乙炔基三苯胺分子在Au(111)表面上的超分子结构构型的转变过程。实验表明,4-乙炔基三苯胺分子在50℃时就可以发生端炔基间的环加成反应,并由于分子间的位阻效应只生成一种非手性产物。该产物在较高退火温度下能自组装成具有自愈合特性的手性六角密排超分子结构。
[Abstract]:The metallization of 5,15- two phenyl porphyrin molecules induced by copper atoms on gold (111) surface was systematically studied by room temperature ultra high vacuum scanning tunneling microscope. By controlling the deposition order of copper atoms and 5,15- two phenyl porphyrin molecules on the gold surface, the copper atoms were observed to enter the 5,15- two phenyl porphyrin molecules at the molecular level. The approach is that copper atoms tend to form crystalline islands under the self assembly layer of 5,15- two phenyl porphyrin at room temperature, regardless of the deposition of copper atoms prior to the 5,15- two phenyl porphyrin molecules on the sample surface or after the deposition of 5,15- two phenyl porphyrin molecules on the sample surface, and the copper atom will be given when sufficient excitation energy is given to the outside world. The metallization of the 5,15- two phenyl porphyrin molecule enters the molecule at the bottom of the molecule. At the same time, the self organizing behavior of the 5,15- two phenyl porphyrin molecule on Ag (110) is studied by the ultra high vacuum scanning tunneling microscope operating at room temperature and liquid nitrogen temperature. The conjugated molecular chain is constructed by the dehydrogenation cyclization reaction between the molecules. It is clear that the self-assembly behavior of 5,15- two phenyl porphyrin molecules on the surface of Ag (110) and the chain orientation of the molecular chain are modulated by the lattice of the silver substrate. The experimental results of the liquid nitrogen temperature show that the silver surface participates in the catalytic reaction of the dehydrogenation and cyclization of the 5,15- two phenyl porphyrin, and the band gaps of the unchain molecules are compared to the chain molecules. The band gap should be narrow. Using the room temperature ultra high vacuum scanning tunneling microscope system, the transition process of the supramolecular structure of the chiral 4- acetylene three aniline molecule on the Au (111) surface induced by the surface ring addition reaction is studied. The experiment shows that the 4- acetylene three aniline molecule can occur the cycloaddition reaction between the end alkyne at 50. It is necessary to produce only a kind of chiral product due to the intermolecular steric effect. The product can be self assembled into a chiral six angle supermolecule structure with self healing properties at high annealing temperature.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG174.4

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