Synthesis, Crystal Structures And Properties Of Conjugate Metal Phosphonate Coordination Polymers

In this work, eight phosphonate coordination polymers with1–hydroxy–2–（3–pyridyl）ethylidene–1,1–diphosphonic acid,（C₅H₄N）CH₂C（OH）（PO₃H₂）2（hpyedpH₄） and N morpholinomethylphosphonic acid, H₂O₃PCH₂N（CH₂CH₂）₂O （H₂L） as thephosphonate ligands, oxalate and1,4–benzenedicarboxylic acid as the second metal linkerhave been synthesized under hydrothermal conditions. Then they were structurallycharacterized by X ray single crystal diffraction, X ray powder diffraction, infraredspectroscopy and TG analysis. Luminescence properties of compounds38have been studied.The SPS of compounds4,5and7have been studied. The chemical constitution formulas arelisted as follow:（1） Mg（H₂O）[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）]（2） Fe（H₂O）[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）]（3） Cd[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）]·H₂O（4） Fe_1.5（H₂O）[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）（C₂O₄）_0.5]（5） Co_1.5（H₂O）[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）（C₂O₄）_0.5]（6） Zn_1.5（H₂O）[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）（C₂O₄）_0.5]（7） Cu_1.5[（C₅H₅N）CH₂C（OH）（PO₃）（PO₃H）（C₂O₄）_0.5]（8） Cd₂[L][Hbdc][bdc]Compounds17were synthesized by using1–hydroxy–2–（3–pyridyl）ethylidene–1,1–diphosphonic acid. Compounds13are1Dstructures through hydrogen bonds forming3D supramolecular structures and compounds1and2are isomorphic. Compounds47are2D structures through hydrogen bonds forming3Dsupramolecular structures and compounds46are isomorphic. By introduction of1,4–benzenedicarboxylic acid as a second organic ligand, compound8withN morpholinomethylphosphonic acid has been synthesized. Compound8is a3D frameworkstructure. Luminescence analyses show that compounds38will be candidate for luminescentmaterials. The SPS indicate compounds4,5and7show p–type semiconductor characteristic.