Assembly And Properties Of Crystalline Porous Materials Based On Triazine Derivatives

The crystalline porous material not only has the advantages of traditional porous materials,but its structure and channels are also easy to characterize and modify,which makes its application prospects in chemical sensing,selective gas adsorption and gas separation more broad.The bifunctional triazine derivative ligands are rich in functional N-sites,and the DAT groups in the ligands can form coordination bonds or hydrogen bonds.Using them as organic units to construct porous materials can not only give excellent performance to the material by functionalizing the pore surface,but also bring the diversification of the structure.In this paper,three crystalline porous materials were assembled and synthesized by using bifunctional triazine derivative ligands,which were then used for organic molecular sensing,selective gas adsorption and gas separation.The specific content is as follows:Firstly,two organic ligands 2,4-diamino-6-（4-pyridine）-1,3,5-triazine（DAPT）and1,3,5-tri-（4-carboxyphenyl）benzene（H₃BTB）were used to synthesized with metal zinc ions to get the FJU-120 with photoluminescence behavior.FJU-120 has selective fluorescence quenching behavior for nitrobenzene,and the corresponding quenching constantK_sv is 1124.65 L/mol.Then,a new 8-connected metal-organic framework（termed as FJU-99）was successfully prepared by inserting the bidentate pore partition agent 2-amino-4,6-bis（4-pyridine）-1,3,5triazine（ADPT）into the MIL-88 structure.FJU-99a shows a permanent porosity with a BET specific surface area of 802.5 m²/g.Dynamic breakthrough experiments show that FJU-99a has excellent separation performance for C₂H₂/CH₄ and C₂H₂/CO₂.Last,the bifunctional ligand 2,4-diamino-6-（4-pyridine）-1,3,5-triazine（DAPT）and4-(4,6-diamino-1,3,5-triazine were chosen to constructed hydrogen-bonded metal-complex framework[Cu_0.5（DAPT）（DAT-BC）·（DMF）_1.5],and the framework was based on the complex of mononuclear copper and triazine derivative as structural unit.After acetone exchange,FJU-121 was converted to FJU-121T with the single crystal to single crystal transformation.The 196 K CO₂adsorption isotherm indicates that FJU-121Ta has permanent porosity,and its BET surface area and Langmuir surface area reach 325.8 m²/g and 448.7 m²/g,respectively.IAST results show that FJU-121Ta can selectively adsorb C₂H₂/C₂H₄（50:50）and C₂H₂/CO₂（50:50）binary mixtures.