Synthesis Of Triphenylene Derivatives And Doping Induced Liquid Crystal Molecular Alignment

This thesis is focused on the synthesis and self-assembly mechanism of triphenylene discotic liquid crystal materials (DLCs). Discotic liquid crystal can be self-assembled into a one-dimensional charge transport channel because of its special molecular structure. And this helps to cause a high charge transporting properties. This special property makes it possible for DLCS to use as photoelectric material. More recently more DLCS are applied to carrier-transporting materials in organic light-emitting diodes, field-effect transistors, photoconductivity, photovoltaic and optical storage. It is necessary to make further study on self-assembly of DLCS and search for new functional DLCS.The work covers three main parts:1、A triphenylene material TP-5was doped with an electron deficient material TNF to form a charge transfer complex measured with UV and Infrared spectrometry. Explore the optimum condition for doped material to get uniform alignment by controlling the anneal rate. Molecular orientation was monitored using DSC and polarizing microscope.2、A triphenylene material TP-5was doped with an electron deficient material tetra-chloro-p-benzoquinone to promote molecular self-assembly and the molecular alignment. By changing the doping proportion and the cooling rate to get the best homeotropic alignment condition.3、Make an investigate of properties and synthesis rotes of zaztriphenylene materials. And synthesis two triphenylene materials using substitution reaction, iodination reaction, Willimenson, double-coupling reaction and reduction reaction. The two materials are characterization by1HMR. And then try to synthesis triphenylene-quinone material which is precursor material of azatriphenylene. The result is characterized by mass spectrometry and the method is proved useful. All of these lay the foundation for the synthesis of azatriphenylene materials.