Wu ShiLi, Zhao FengYing, Luo ShiWen, Zhang WenJie, Xu ShanDong, Zeng QingDao
J Nanosci Nanotechnol. 2017 Jan;17(1):725-28. doi: 10.1166/jnn.2017.12402.
A new compound (2,4,6-tris-(3,5-di-methyl formate-4′-hydroxy azobenzene)-1,3,5-triazine,TDHAT) has been synthesized and the scanning tunneling microscopy (STM) is utilized to clarify the geometrical configuration on the highly oriented pyrolytic graphite (HOPG) surface. The star-shaped molecule self-assembles into uniform and regular triangular petal structure at liquid–solid interface, and high-resolution images has been obtained, which implied a high stability of this two dimensional configuration. The distance between the scattered bright spot and the center of the petal is measured to be about 1.2 nm (L₂), which corresponds to the actual size of each arm. Moreover, a comparison has been made between the TDHAT molecule and the TMA 4a molecule which has similar star-shaped structure with a long alkyl chain at the each end of the three arms, drawing a conclusion that both the structure of arms and the substituent groups would impact the nanoarchitecture. The results give us insight into a better comprehension of the self-assembly of the star-shaped molecule, which benefits the construction of functional nanostructures.
一种新型化合物（2,4,6-三（3,5-二甲基甲酸酯-4′-羟基偶氮苯）-1,3,5-三嗪，TDHAT）已被合成，并且利用扫描隧道显微镜（STM）来阐明其在高度定向热解石墨（HOPG）表面的几何构型。这种星形分子在液-固界面自组装成均匀且规则的三角形花瓣结构，并获得了高分辨率图像，这意味着这种二维构型具有很高的稳定性。测量得到散射亮点与花瓣中心之间的距离约为1.2 nm（L₂），这与每个臂的实际尺寸相对应。此外，还对TDHAT分子与TMA 4a分子进行了比较，TMA 4a分子具有类似的星形结构，在三个臂的每一端都有一条长烷基链，得出的结论是臂的结构和取代基都会影响纳米结构。这些结果有助于我们更好地理解星形分子的自组装，这有利于功能性纳米结构的构建。
