| Coordination polymers are a new class of porous crystalline materials formed by self-assembly of metal ions or ion clusters with organic ligands.In recent years,porous coordination polymers exhibited unique physical and chemical properties and potential applications in magnetics,fluorescence sensor,ion exchange,gas storage,and catalysis.Therefore,the design and synthesis of coordination polymers with special structures and functions has become a research hotspot in the fields of chemistry and materials science.In this paper,a series of coordination polymers are designed and synthesized by a solvothermal reaction of a nitrogen-containing heterocyclic ring containing a number of coordinating groups and carboxylic acid with transion metal ion.Their structures were characterized by X-ray powder diffraction,X-ray single crystal diffraction,elemental analysis,infrared spectroscopy,and thermogravimetric analysis.At the same time,the properties of some crystals such as magnetic,catalytic and fluorescent sensor were also studied.This thesis mainly included the following three parts:i In this section,we adopted 2,2'-dinitrobiphenyl-4,4'-dicarboxylic acid and 4,4-bipyridyl,bis?4-pyridyl?ethylene,1,3-bis?4-pyridyl?propane,1,4-bis?imidazolyl?benzene,1,4-bis?imidazol-1-ylmethyl?benzene and 4,4'-bis?imidazolyl?biphenyl,a series of different nitrogen donors as a mixed ligand,six coordination polymers({Co?dnpdc??bipy?}n,{[Co3?dnpdc?3?bipy?3?H2O?2].2H2O}n,{[Co5?OH?2?dnpdc?4.?bpp?2?H2O?2].2H2O}n,{Co?dnpdc??bimb?.?H2O?}n,{Co?dnpdc??bcim?.?H2O?0.5}n,{Co2?dnpdc?2?bpee??bpim?}n)are hydrothermally assembled with the transition metal CoII?1-6?.At the same time,we also studied the magnetic properties of compounds 1,3 and 6,and found that they all have antiferromagnetic properties.?In this part,we selected 2,2'-dinitrobiphenyl-4,4'-dicarboxylic acid with bis?4-pyridyl?ethene and 1,4-bis?imidazolyl?benzene with nitrogen-containing ligands combiningintoamixedligand,andthecoordination polymers?[Cd2?dnpdc?3?DMSO?3·0.5H2O]n,[Cd?dnpdc??bpee?]n,{Cd?dnpdc??bimb?·2H2O}n?are hydrothermally synthesized with the transition metal CdII?7-9?.At the same time,we studied its fluorescence properties and found that compound 9 has high selective fluorescence sensing for Fe3+.?In this section,we used 2,4,6-tris?4-pyridyl?-1,3,5-triazine?TPT?as the main ligand and 5-substituted isophthalic acid?H2BDC,NO2-BDC,CH3-BDC,HO-BDC,tBu-BDC?as derivative auxiliary ligand,five coordination polymers{[Co?1,3-BDC??TPT?]·0.5?H2O?}n,{[Co?NO2-BDC??TPT?]·H2O}n,{[Co?CH3-BDC??TPT?]·0.5H2O}n,{[Co?HO-BDC??TPT?]·0.5H2O}n,{[Co?tBu-BDC??TPT?2/3]·?CH3CH2OH??H2O?}n?10-14?Co-containing were synthesized by hydrothermal method.The catalytic performance of on Knoevenagel condensation reaction and styrene epoxidation reaction was studied.The results showed that the coordination polymers 11 and 12 have high conversion rate for Knoevenagel condensation reaction;and the complexes 11 and 14 to epoxidation of styrene has a higher conversion and selectivity. |
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