Synthesis,Crystal Structures And Properties Of Carboxyphosphonates Functional Materials

Inthiswork,eightnovelphosphonatecoordinationpolymerswith（4–HOOCC₆H₄CH₂CH₂PO（OH）（OC₂H₅））（H₂L’）and（4–HOOCC₆H₄CH₂NHCH₂PO₃H₂）（H3L）as carboxyphosphonate ligands have been successfully synthesized under hydrothermal conditions.All above compounds were structurally characterized by X-ray single-crystal diffraction,X-ray powder diffraction,infrared spectroscopy and thermogravimetric analysis.Meanwhile,the surface photovoltage properties of compounds 3,5,6 and the luminescence properties of compounds 1–8 have been studied.Furthermore,molecular recognition properties of compounds 7 and 8 in different organic amine and alkyl alcohol suspensions were also investigated by the fluorescence method.The chemical formulas are listed as follow:（1）Cd[（HOOCC₆H₄CH₂PO₃H）₂（H₂O）₂]（2）Ag[HOOCC₆H₄CH₂PO₃H]（3）Mn_0.5[（HOOCC₆H₄CH₂PO₃H）（H₂O）₂]（4）Mn[(HOOCC₆H₄CH₂PO₂（OC₂H₅）]₂（5）Co[(HOOCC₆H₄CH₂PO₂（OC₂H₅）]₂（6）Cu[(HOOCC₆H₄CH₂PO₂（OC₂H₅）]₂（7）Cd[(HOOCC₆H₄CH₂PO₂（OC₂H₅）]₂（8）Pb[HOOCC₆H₄CH₂N（CHO）CH₂PO₃]Compounds1–7havebeensynthesizedbyemploying（4–HOOCC₆H₄CH₂CH₂PO（OH）（OC₂H₅））（H₂L’）as the phosphonate ligand.X-ray diffraction analysis shows that compounds 1 and 3 show 2D and 3D supramolecular structures by hydrogen bonding interactions.Compound 2 features a 2D layer structure.Compounds 4–7 are isostructural and adopt a 3D framework structure.Compound 8 is obtained by using（4–HOOCC₆H₄CH₂NHCH₂PO₃H₂）（H₃L）as the phosphonate ligand.X-ray diffraction analysis shows that compound 8 exhibits hydrogen bonding interactions and compound 8 shows a 3D supramolecular network.Thermal stabilities experiments of compounds 2,4–7 reveal that compounds 2,4–7 have the stabilized framework structures from room temperature to 240°C and 290°C.The SPS and FISPS of compounds 3,5,6indicate that they exhibit surface photovoltage properties and show p–type semiconductor characteristic.The luminescence analyses indicate that compounds 1–8 are good candidates for blue–light luminescent materials.The molecular recognition experiments show that compounds 7 and 8 may be potentially used for the sensing of ethanediamine and 1–propanol.