| Summary: | 碩士 === 國立中山大學 === 化學系研究所 === 106 === Discotic liquid crystals (DLCs) have gain importance in recent years as charge and energy transporting materials for potential applications as organic photovoltaics (OPVs), organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFETs) devices. As such, much keen interests have been concentrated on tuning the mesomorphic and electronic properties of the DLCs. In our previous research, dibenzo[a,c]phenazines (DBP) has been found to be a good ambipolar candidate. However, to date little studies have been undertaken to tune the molecular energy by modifying the structure of DBP to further extend their usefulness in device applications
The objective of this study is to incorporate an electron-deficient benzo[1,2,5]thiadiazole (BT) fragments onto the π-conjugated system of DBP with the following aims: (i) desymmetrization of the DBP for tuning the mesomorphism, and (ii) tuning the absorption and electrochemical properties of the discogen. Herein, we report the synthesis a series of tetraalkoxydibenzo[a,c]-[1,2,5]thiadiazolo[3,4-h]phenazines (sDBTPs). In addition, the liquid crystal properties will be investigated systematically using POM, DSC and X-ray diffraction. The primary findings will enable further development of new discotic core for application in devices such as bulky junction solar cell based on ambipolar molecules.
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