Organic Molecules For Molecular Devices Self-assembly Of Light Behavior

In this dissertation, the organic molecular self-assembly and the photoinduced reaction was studied by scanning tunneling microscopy (STM). Two self-assembled basic molecular devices, molecular switches and molecular conductive wires were constructed on HOPG surface.1.A series of 1, 3, 5-triazine incorporating benzenazonaphthanlene moieties has been synthesized. The ordered self-assembly of compound 4 was observed by STM. Photoinduced isomerization causes the self-assembly disordered. The ordered self-assembly of compound 3 was also obtained. The coexistence of trans- and cis- isomer was observed after photo irradiation. The results presented prove the possibility of using them as molecular switches.2.The self-assembly and photopolymerization of compounds containing diacetylene group were studied on HOPG surface. The self-assembled conjugated polydiacetylene conductive nanowires were obtained after applying UV irradiation. The spacing between nanowires can be controlled by co-adsorption. The results provide a general method to obtain well-ordered and spacing-controllable conductive nanowires.3.Other liquid crystal molecules and dendrimer were synthesized. The self-assembly of them was studied on HOPG.