Design,Synthesis And Properties Study Of Swivel Cruciform Conjugated Organic Molecules Based On Anthracene Center

In recent years,Organic Light-Emitting Diode(OLED)has attracted a lot of attention due to its low energy consumption,low weight,high definition,wide viewing angle and fast response.It is also known as the new generation display technology.It has great practical significance and potential applications in panel display and solid state lighting.Full color displays require red,green,and blue light with relative stability,efficiency,and color purity.Due to the inherent wide band gap of the blue luminescent material,it is difficult to inject charge into the emitter,so the performance of the blue light device is often inferior to that of the red and green light emitting devices.Therefore,it is important to develop high performance blue OLED devices.In recent years,anthraquinone derivatives have excellent electroluminescence properties and the advantages of doping host materials,and have been a hot material that people have been researching and discussing.However,the molecular modification is almost always bonded to the alignment along the linear conjugate direction of the diaryl fluorene.Unlike the past,the design method of the novel thiol modification is in the strong steric hindrance of the fluorene ring.At the 10 th position,the phenyl group is a conjugated bridge,and the steroids of different structures and properties are bonded at the ortho position of the phenyl group.The molecules repel each other and exhibit a strong twisted weakly conjugated space vortex cross structure,which effectively reduces enthalpy.The ?-? interaction between the body,the corpus callosum and the anthracene ring and the anthracene ring improves the solubility,high fluorescence and thermal stability of the material.Mechanofluorochromic refers to a phenomenon in which the state of aggregation and the color of fluorescent light change significantly under the action of external force.After solvent fumigation or thermal annealing,the fluorescent color can return to its original state.It is possible to regulate the optical properties of molecules without changing the molecular composition,and has great application prospects in multi-stimulus response and multifunctional photoelectric materials.In this paper,the effects of molecular geometry and conformation,aggregation behavior,fluorescence color and thermal properties were studied by adjusting the geometric symmetry of the molecules and the different bonding groups.The specific design and synthesis are as follows:1.Different steroidal bis(4-tert-butylphenyl)carbazole and bis(4-t-butylphenyl)amine were respectively attached to the 9-position of the nucleus by phenyl bridge.Different kinds of cyclotron molecules AnBCZ and AnBDPA were studied,and the effects of different carcasses on molecular properties were studied.Studies have shown that the AnBCZ and AnBDPA emission spectra are located in the blue region.With the increase of solvent polarity,the fluorescence spectrum of AnBDPA has a large red shift,showing obvious solvation effect,indicating that the charge is mainly in the charge transfer(CT)state,but the molecular AnBCZ increases with the polarity of the solvent.Large,the fluorescence spectrum shift changes little,no significant solvation effect is observed,and the molecules exhibit LE state characteristics.At the same time,both have obvious mechanical piezochromic behavior,and the phase transition between crystalline and amorphous states under external stimulation is the main cause of this phenomenon.2.The design and synthesis of ruthenium as the center,phenyl is a conjugated bridge,and the aldehyde group and bis(4-t-butylphenyl)amine are respectively introduced in the ortho position of the phenyl group,and the maneuver of two different conformations is obtained.Molecules anti-2CHOBDPA-m and syn-2CHOBDPA-m.Due to the vortex cross formed by the strong steric repulsion between the anthracene ring and the corpus callosum,the intermolecular ?-? interaction is effectively reduced,and the film formation and photoelectric properties of the molecule are improved.It is found that compared with the unilateral cyclone molecule,the molecular symmetry and the degree of distortion can be improved,the thermal stability of the molecule can be improved,and the wavelength red shift can be suppressed to obtain a photoelectric material with higher fluorescence and more pure color.Interestingly,the photophysical properties of the conformers are quite different.Compared to the cis structure,the molecules of the trans structure are less soluble in organic solvents and have a higher melting point.