Hybrid Framework Phosphite Constructed By Polyimidazole-based Ligands And Its Properties

Crystalline open-framework inorganic materials have been extensively studied because of their rich structural chemistry and widespread applications in catalysis,ion-exchange and separation.Based on self-assembly and stepwise assembly strategy,a series of organic-inorganic hybrid materials have been solvothermally synthesized,namely,[Zn₈?HPO₃?₈?tib?₂]·6?H₂O??1?;[Zn₆?HPO₃?₆?tib?₂]·?DMF??5?H₂O??2?;[Zn₆?HPO₃?₆?tib?₂]·?DMA??5?H₂O??3?;[Zn₃?HPO₃?₂?tib?₂]?4?;[Zn₃?HPO₃?₃?tib?]?2?H₂O??5?.The as-synthesized product was characterized by singlecrystal X-ray diffraction,powder X-ray diffraction,IR spectroscopy,thermogravimetric analysis?TGA?and elemental analyses.In chapter 1,a brief introduction of the research background and related concepts of this work were presented.The research progresses of microporous compounds were concisely reviewed.The research significance and main results of this thesis were also illustrated.In chapter 2,the structure of organic-inorganic hybrid materias based on pyridyl ligands was investigated.Compound 1 exhibits a 3D framework with large channels composed of 18 double-decker zinc and phosphite tetrahedral units.Compounds 2-3 are two isostructural compounds,which are constructed from ZnO₃N and HPO₃^2-as the secondary building units.These inorganic clusters are spatially organized by different structure-directing agents into different three-dimensional frameworks.Compound 4crystallizesinthemonoclinicsystem,P-1,whichareconstructedfrom[Zn₃?HPO₃?₂?tib?₆]²⁺clusters as the same secondary building units.These inorganic clusters are spatially organized into two-dimensional frameworks.Compound 5 is constructed from ZnO₃N and HPO₃^2-as the secondary building units.These inorganic clusters are spatially organized into two-dimensional frameworks.In chapter 3,the nature of the five compounds was also explored.Compound 1exhibits long-lived room temperature phosphorescence properties.Compounds 2-5 were tested for room temperature fluorescence,respectively..Among them,fluorescence is exhibits in the range of 325-400 nm.