Design,preparation And Application Of Optical Functional Crystalline Materials

The crystalline materials have attracted widespread attention of scientists due to their properties such as homogeneity,anisotropy,self-regulation,symmetry,fixed melting point,and X-ray diffraction.In recent years,the design and development of crystalline materials with optical functional properties have caused great attention and research interest of the scientists because of the fact that optical functional crystalline materials have exhibited significant promise in a variety of fields of organic light emitting diodes（OLEDs）,organic lasers,fluorescent sensors,and biological imaging.In this study,we have designed and synthesized several novel crystalline materials with photo-functional properties.Based on their structural characteristics,we have studied their respective photo-functional properties and applications in detail.I.In this section,we designed and synthesized two donor-acceptor boron difluoride complexes BL1 and BL2 based on 1,4-diketone fulvene ligands.The new organic acceptor part of BL1 and BL2 is fulvenedione ester boron difluoride（BKF）,as confirmed by theoretical calculations and electrochemical experiments.Compared with 1,4-diketone fulvene ligands,BL1 and BL2 show stronger photoluminescence properties,and this type of complex shows strong aggregation-induced fluorescence（AIE） properties.In addition,experimental results and characterizations confirm that the complex BL2 has mechanically-chromic luminescence properties.II.In this section,we use tetra-（4-aminophenyl）ethylene and 2,2’- bipyridine-5,5’-diformaldehyde as functional organic monomers to design and synthesize a new type of Schiff-base COFs（S-COF）,and then we anchored the Mn（CO）₅Br and Re（CO）₅Cl complex on the exposed pyridine sites of the Schiff-base COFs by post-modification approach,thus,two new photoactive COFs materials,termed as Mn-COF and Re-COF,were obtained.We carried out detailed structural analysis and characterization of the obtained COFs materials,and verified the photocatalytic activity of the obtained COFs materials by visible light driven photocatalytic hydrogen evolution from water.The experiment proves that the hydrogen production rate of Mn-COF can reach 184.89μmolg^-1h^-1 and the hydrogen production rate of Re-COF is 62.12μmolg^-1h^-1 in the ascorbic acid solution.