Cadmium(II) and Nickel(II) Complexes With 4-Hydroxypyridine-2,6-dicarboxylic Acid: Synthesis and Crystal Structures

Abstract

Two new complexes, [Cd(hpdaH)(H2O)1.5]2n.n(bpp) (1) and [Ni(hpdaH)(2′2-bipy)H2O]·(H2O)2(2) (hpdaH3 = 4-hydroxy- pyridine-2,6-dicarboxylic acid, bpp = 1,3-bi(4-pyridyl)propane, 2,2′-bpy = 2,2′-bipyridine), were synthesized under hydrothermal conditions at 140°C and were characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction. Both crystallize in monoclinic system, space group Pc with a = 12.4435(15), b = 9.0015(11), c = 13.7170(17) Å, β = 99.9970(10)°, Z = 4 for 1 and space group P2(1)/n with a = 17.0228(14), b = 11.1624(9), c = 19.9271(16) Å, β = 93.9050(10)°, Z = 8 for 2. X-ray analysis demonstrates that complex 1 has a novel one-dimensional coordination polymeric structure linked by two kinds of bridging groups in an alternating manner. Complex 2 contains a mononuclear Ni(II) complex and two solvate water molecules. Furthermore, two complexes extend to supramolecular architectures via rich hydrogen bonding interactions.