The Assembly And Regulation Of Tetrstyrene Derivatives With Photoelectric Properties On Graphite Surface

In recent years,due to its unique aggregation induced luminescence（AIE）and other photoelectric properties,tetrastyrene（TPE）derivatives have been widely studied,which is of great significance to the further construction of photoelectric devices and nanomaterials.In this study,STM was used as the main research method to explore the co-assembly,host-guest assembly,and self-assembly structures of three derivatives including:acid,single macrocycles,and double macrocycles on the surface of graphite substrate（HOPG）.The main research results are summed up as follows:1.The co-assembly structure of TPE derivative tetracid（H₄ETTC）and star shaped oligopolyfluorene triacid（StOFs）on graphite surface was studied.H₄ETTC shows an x-shaped grid structure,while StOFs shows a regular hexagonal honeycomb structure.In the binary system of StOFs and H₄ETTC,we successfully found a new co-assembly structure that breaks the original honeycomb hexagonal network structure of StOFs and the original quadrilateral grid structure of H₄ETTC.There are also small-scale different co-assembly structures in this new co-assembly structure.This new co-assembled structure provides a basis for further research on two-dimensional molecular nanoarrays with propeller-structured TPE derivatives.Meanwhile,these studies are expected to strengthen the control of two-dimensional self-assembly and provide a research method for the construction of surface molecular clusters.It provides a new idea for the research of candidate materials in the fields of nonlinear optics,electronics and optoelectronic devices.2.The self-assembly structures of two TPE derivative single conjugated macrocycles TPEMC and TPEMCS on the HOPG surface were studied,and the co-assembly structures of conjugated macrocycles TPEMC and fullerene C60 were constructed.We found that both TPEMC and TPEMCS can be assembled into compact large cavity structure.In the TPEMC large ring,C60 guest molecules can successfully enter the cavity and generate bright spots.However,for the TPEMCS large ring,the C60molecule did not enter the main body large cavity,mainly because the thiophene group in TPEMCS flipped to the outside,so it could not transfer electrons with the C60molecule to form the coating structure.The new conjugated macrocyclic compounds with AIE properties can provide convenience for the development of new structured luminescent materials.3.The self-assembly behavior of a series of double conjugated macrocycles large on the HOPG surface is studied.According to STM images,we found that all the three kinds of doublet macrocyclic molecules can show the characteristics of multi-cavity in the solid-liquid interface of 1-phenyloctane solution,and the TPE units in their structure will show obvious highlights in the image.At the same time,our target molecules can self-assemble into large ring systems with infinite conjugation.The study on the self-assembly structure of macrocyclic system is helpful to observe the manipulation molecules and to construct the porous network structure and nanotube in the nanomaterials.These results provide new ideas for the study of single molecule self-assembly,binary system co-assembly and host and guest assembly of STM.At the same time,it can be used as a reference for the further construction of photoelectric nanomaterials by the derivatives of tetrastyrene（TPE）with photoelectric properties and their macrocyclic structures.