Synthesis And Study Of Metal-organic Framework Materials Based On 1,3-bis(benzimidazol-1-yl)propan

Chiral metal-organic frameworks are an important branch of metal-organic frameworks.Chiral metal-organic frameworks have great potential for chiral resolution due to their rich and varied porous structures,high specific surface areas,and chiral functional groups.Flexible bisbenzimidazole-based ligands have freely rotatableσbonds,which can bend and rotate freely when coordinated with the metal central atom,thereby forming different spatial configurations,resulting in the diversity of spatial configurations of metal-organic coordination polymers Therefore,flexible bisbenzimidazole ligands are widely used in the synthesis of new metal-organic coordination polymers.Therefore,the synthesis and research of chiral metal-organic frameworks based on flexible bisbenzimidazole ligands are of great significance.The main work of this subject is as follows:1.Using 1,3-bis（benzimidazol-1-yl）propane（bbp）as a flexible ligand and D-camphoric acid（D-cam）as a chiral ligand,combining Co²⁺ions,Ni²⁺ions and Cd²⁺ions Three novel chiral metal-organic coordination polymers[Co（D-cam）₂（bbp）₂]_n（MOF1）,[Ni（D-cam）₂（bbp）₂]（MOF2）were synthesized by hydrothermal synthesis and diffusion method and{[Cd（D-cam）₂（bbp）₂]4H₂O}_n（MOF3）,by elemental analysis,single crystal XRD diffraction,powder XRD diffraction and infrared spectroscopy,etc.The structure of the material has been characterized by various means.2.The results of structural analysis show that MOF1,MOF2 and MOF3 are all crystallized in monoclinic system,P2₁chiral space group,which is attributed to the chirality of the ligand D-camphoric acid（D-cam）.Among them,MOF1 and MOF2have a two-dimensional network structure,showing an"M"-shaped network topology,while MOF3 is a 2D supramolecular structure formed by one-dimensional chains connected by hydrogen bonds.3.The performances of MOF1,MOF2 and MOF3 are preliminarily explored.Through thermogravimetric analysis,MOF1,MOF2 and MOF3 all have good thermal stability,and the structure collapse temperature is above 300°C;Three metal-organic coordination polymers have solid fluorescence behavior and liquid fluorescence behavior,which are attributed to the aromatic rings contained in the BBP ligands containing multiple larger conjugated systems.Among them,MOF1 has the best fluorescence performance,can emit strong fluorescence in liquid,and can specifically recognize nitrobenzene and R-ibuprofen and S-ibuprofen,D-phenylalanine and L-phenylalanine in enantiomers;The electrochemical hydrogen peroxide sensor constructed by MOF2 material modified glassy carbon electrode was studied.By studying the cyclic voltammetry curves of MOF2/GCE in 0.1 mmol/L sodium hydroxide electrolyte and the amperometric response curve of dropwise addition of hydrogen peroxide,the results show that MOF2/GCE has potential applications in hydrogen peroxide detection.