取代基对聚亚苯基乙炔二维有序性的影响——一项扫描隧道显微镜研究。

Influence of substituents on two-dimensional ordering of oligo(phenylene-ethynylene)s--a scanning tunneling microscopy study.

作者信息

Mu Zhongcheng, Yang Xunyu, Wang Zhiqiang, Zhang Xi, Zhao Jinling, Bo Zhishan

机构信息

Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.

出版信息

Langmuir. 2004 Sep 28;20(20):8892-6. doi: 10.1021/la048538w.

DOI:10.1021/la048538w

PMID:15379523

Abstract

Two-dimensional (2D) assemblies of alkoxy-substituted oligo(phenylene-ethynylene)s bearing different substituents adsorbed on highly oriented pyrolytic graphite (HOPG) were studied by using scanning tunneling microscopy. It was found that the introduction of different endgroups or a biethynylene linkage into oligo(phenylene-ethynylene)s can significantly change their 2D ordering on HOPG. The carboxylic endgroups can direct the conjugated oligomers to form ordered lines through intermolecular hydrogen bonding. The possibility of controlling the 2D assemblies of conjugated molecules is of importance in designing organic optoelectronic devices.

摘要

通过扫描隧道显微镜研究了吸附在高度取向热解石墨（HOPG）上的带有不同取代基的烷氧基取代的寡聚（亚苯基乙炔）的二维（2D）组装体。研究发现，在寡聚（亚苯基乙炔）中引入不同的端基或双乙炔连接可以显著改变它们在HOPG上的二维有序性。羧基端基可以通过分子间氢键引导共轭低聚物形成有序的线条。控制共轭分子二维组装体的可能性在设计有机光电器件中具有重要意义。