Syntheses And Properties Of Pyridyl-calix[4]arene-based Polyoxometalate Inorganic-organic Hybrids And Coordination Polymer

In this paper,two polyoxometalate-based inorganic-organic hybrids [Cu₂L(SiW₁₂O₄₀)_0.5]·CH₃CN·2H₂O?1?,[CoL(SiW₁₂O₄₀)_0.5·2H₂O]?3?and one coordination polymer [CdLCl₂]·CH₃CN?2?were synthesized by using pyridyl-modified calix[4]arene as ligand L.1 and 3 are layered structures,which are further extended to three-dimensional supramolecular structures by the H-bonds between layers.2 exhibits a chain structure,and which is further connected into a layer due to the hydrogen bonding interactions.In this paper,X-ray single crystal diffraction,elemental analysis,IR,thermogravimetric and PXRD were used to characterize the structures.Heterogeneous catalytic performances of 1 and 2 were also studied respectively.Studies have shown that hybrid 1 has catalytic activity for the azide-alkyne cycloaddition reaction,and the catalytic activity does not change significantly after 5 cycles.Compound 2 has catalytic activity for Knoevenagel condensation reaction under solvent-free condition.