Sythesis And Characterization Of N-Type Molecule Graphene

In past decades, there has been significant interest in developing small graphene molecules of their potential applications in semiconducting devices such as organic field effect transistors, organic light-emitting diodes, and photovoltaic cells. The graphene molecules commonly display p-type characteristics and the hole mobility of thin films can go as high as4.28cm2V-1s-1, However, n-type organic materials, which are the required in semiconducting devices to complete p-n junctions or complementary logic behaviors are obviously lacking. Currently, pursuing high-performance n-type materials has become the focus of materials research. One strategy suggested by Houk et al. is that to replace carbon atoms in grapheme by nitrogen atoms.N-doped Graphene molecules could exhibit promising electron-transport behaviors because of their high electron affinities.The main work includes three parts:Part I:Synthesis and characterization of nitrogen-doped molecule graphene. The molecule graphene precursors8,20,21,41and51with different nitrogen atom number and structure were successfully synthesized from5-bromo-2-iodo pyrimidine by several steps. The experimental results showed that8,21,41could not be cyclized under the chosen oxidizing conditions. Although oxidative cyclized product from precursors20was found by MALDI-TOF mass, the final product was not obtained due to the poor stability. TM3b was successfully synthesized by oxidative cyclization of the corresponding precursor51, and TM3b was characterized by NMR、 MALDI-TOF mass、UV、FL.Part II:Synthesis and characterization of coordinated compound. The coordination of the hexaarylbenzene8,20and21with silver salt was discussed. The results of UV、FL and NMR measurements showed that the nitrogen atom on pyrimidine ring easily coordinated with silver ion and then affected the spatial structure and optical properties. PartⅢ:Synthesis and characterization of metal-organic framework materials. The41was used as ligand to synthesis metal-organic framework materials (MOF). The results of TG、XRD、 SEM、ESEM and TEM exhibited not only ordered external morphology, but also internal crystallography characteristics.