Abstract
Two nickel (II) complexes, [Ni(Hcdcp) (H2O)3] (1) (H3cdcp = 3-(4-carboxylatephenyl)-2,6-pyridinedicarboxylic acid) and [Ni3(Hdcdcp)2(H2O)6]n (2) (H4dcdcp = 3-(2,4-dicarboxylatephenyl)-2,6-pyridinedicarboxylic acid) have been synthesized under hydrothermal conditions and characterized by elemental analysis and single-crystal X-ray diffraction. For complex 1, Ni(II) ion is coordinated by three water molecules and a deprotonated H3cdcp ligand in chelate mode to form a mononuclear complex; for complex 2, three Ni(II) ions are connected into trinuclear clusters which are further linked into 2D layers by pentadentate Hdcdcp3− ligands in alternant bis-(bridging) and chelate coordination modes; the two complexes are both extend to 3D supramolecular polymers by hydrogen bonds. Thermogravimetric analysis (TGA) and powder X-ray diffraction (PXRD) are also carried out to determine their thermal stability and phase purity. Magnetic measurement for complex 2 reveals that weak antiferromagnetic interactions occur between the bridging trinuclear Ni(II) ions.
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