Synthesis And Properties Research Of Hydrogen Bonded Organic Frameworks

Hydrogen bond is a kind of special interaction in structure chenistry and biology.Hydrogen-bonded organic framework is a kind of crystalline material consists of organic compound that equipped with hydrogen bonding sites.The organic compound contracted with each other through hydrogen bond,then stack with the assistance of other inter-molecular interactions such as π-π stack.Because of the light density,porosity,high specific surface area,simple synthesis and recyclability,HOFs is expected to play an important role in many fields,such as biochemistry,optics,proton conduction.In this paper,six kind of HOFs based on three different kinds of organic compounds were obtained through solvothermal reaction,the structures and properties were investigated.1.Based on the C3 symmetrical and co-planar molecule H3TATB,three kinds of new HOF materials,PFC-11,PFC-12,and PFC-13,have been synthesized and characterized.In these structures,adjacent H3TATB ligands are connected through double hydrogen bonds and forming hexagonal honeycomb 2D layers.Interestingly,all the layers in PFC-11,12,and 13 show regular fluctuations and form a wave-like layered structure.Then the wave-like H3TATB layers entangled in an extremely complicated way and interpenetrated into 3D structures.The difference between them is the law of structure fluctuation of the single layer in PFC-11,PFC-12 and PFC-13.Besides,PFC-11 and PFC-12 exhibits one-dimensional channel and high CO2 uptake.The unique interpenetration manner of PFC-11-13 makes mutually interspersed hexagonal grids moveable under a certain pressure.Besides,PFC-11 and PFC-12 show excellent adsorption ability to π-conjugated benzene and toluene but poor adsorption ability to non-conjugated cyclohexane.2.A novel hydrogen-bonded organic framework,HOF-TCPP(HOF=Hydrogen bonded organic framework,TCPP=Tetrakis(4-carboxyphenyl)porphyrin),has been synthesized via solvothermal reaction.Crystal structure was well determined by single-crystal X-ray diffraction and powder X-ray diffraction(PXRD).Topological analysis reveals that HOF-TCPP exhibits sql 2D layer and features 2D→3D polycanetation.Fluorescence investigation shows that HOF-TCPP displays much higher photoluminescence(PL)intensity than the amorphous ligands TCPP,which can be ascribed to the crystalline structure and hydrogen bonds existed in structure.Two hydrogen-bonded organic framework materials PDI-MA-1 and PDI-MA-2 with layered characteristics were synthesized under solvothermal conditions using Pyromellitic acid diimide(PDI)and melamine(MA).PDI-MA-1 can convert into PDI-MA-2 in situ under heating in the presence of water.Both PDI-MA-1 and PDI-MA-2 display good chemical stability and the ability of proton conduction.