Synthesis And Study The Tunable Optical And Electrical Properties Of The Organic Molecules Containing Hydrazone Structure

The small-molecule-based organic photoelectronic materials have attracted greatattention due to their advantages of well-defined molecular structures, versatility inmolecular design and good stimuli-responsive properties. They have a potential applicationin the fields of biosensors, light-emitting devices and electronic memory. The tunableoptical and electrical properties of small molecules are the base of the design andfabrication of multifunctional organic photoelectric devices, but this issue has remained abig challenge. In this paper, we design and synthesis of photoelectroactive organicmolecules containing hydrazone structure and study the tunable fluorescence propertiesand memory characteristics. This thesis including the following three parts:(1) A compound HATT with a hydrazone bonds were synthesized. HATT formedthree types of aggregated states (HATT crystal, HATT·2H2O crystal and m-HATT·nH2Omicrocrystal). Guest water molecules changed the molecular stacking modes and furtherturned the fluorescence properties of different aggregated states. HATT crystal wereweakly emissive. However, water-containing HATT·2H2O crystal and m-HATT·nH2Omicrocrystal exhibited remarkably enhanced fluorescence emission.(2) Based on the HDTT molecule, a new hydrazone molecule with a distinct donor.We investigated the influence of donor groups with different charge delocalization on hememory behaviors of devices. The introduction of phenol and triphenylamine groupsbrought a stable WORM behaviour and a flash-type memory effect, respectively. Theindependent fine-tuning memory characteristics would be achieved by the changes ofdonor units successfully.(3) An organic molecule SPBD was synthesis, which was featured with enoltautomeric and solid fluorescent. We studied the effect of temperature on the optical properties and further investigated the influences of water ratio and solvents on the opticalproperties.