Synthesis, Crystal Structures And Properties Of Coordination Polymers Based On Derivatives Of Nicotinic Acid

In recent years, the research of coordination polymers (CPs) has attracted much more chemists' attention due to their potential applications in the fields of luminescent, conductor, magnetism, catalysis and adsorption materials et, al. In this contribution, nicotinic acid derivatives were selected as ligands and twenty-seven lanthanide and transition metal CPs were synthesized and characterized by single crystal X-ray diffraction, elemental analysis, IR and UV-vis spectra. Furthermore, the luminescent and magnetic properties were also studied.By using multidentate ligand 2-hydroxynicotinic acid, fourteen lanthanide CPs exhibiting 1D and 2D structures were synthesized under hydrothermal condition. To the best of our knowledge, the 2D Pr(III), Nd(III), Sm(III) and Eu(III) complexes are the first examples of lanthanide CPs exhibiting Kagome lattice structure, which will contribute to the crystal engineering of lanthanide compounds. Magnetic studies reveal that there are antiferromagnetic interactions between the lanthanide ions in the Pr(III) and Nd(III) CPs and ferromagnetic interactions in the Gd(III) CPs.Five new 1D lanthanide CPs were obtained with 6-hydroxynicotinic acid. Among them, Sm(III), Eu(III), Tb(III) and Dy(III) CPs possess good performance in luminescent properties and the Gd complex exhibits weak ferromagnetic interactions.Two 1D Cu(II) CPs were obtained using 2-hydroxynicotinic acid and 6-hydroxynicotinic acid, respectively. One of the Cu(II) CPs exhibits ferromagnetic interactions and the other exhibits antiferromagnetic interactions. Different methods were utilized to quantitatively analyze the magnetic properties.Six transition-metal CPs were obtained using 2-(4'-pyridylmethylthio)nictinic acid and 2-(3'-pyridylmethylthio)nictinic acid as ligand. Magnetic properties of the transition-metal CPs were studied.