Metal-Organic Coordination Polymers Containing Pyridine-2,3-dicarboxylic Acid N-Oxide (2,3-PDCO)

Ten novel metal-organic coordination polymers, [M5(μ3-OH)2(2,3-PDCO)4(H2O)4·xH2O] (2,3-PDCO = pyridine-2,3-dicarboxylic acid N-oxide, M = Mn2+ and x = 3 for 1, M = Co2+ and x = 3 for 3, M = Cd2+ and x = 1.5 for 10), [Mn(2,3-PDCO)(4,4′-bpy)(H2O)2] (2), [M2(2,3-PDCO)2(4,4′-bpy)(H2O)2·xH2O] (M = Co2+ and x = 1 for 4, M = Zn2+ and x = 0 for 7), [M(2,3-PDCO)(L)·H2O] (M = Co2+ and L = bbix (1,4-bis(benzimidazol-1-ylmethyl)-benzene) for 5, M = Zn2+ and L = bix (1,4-bis(imidazol-1-ylmethyl)-benzene) for 8), [Cu(2,3-PDCO)(4,4′-bpy)·H2O] (6), [Zn2(2,3-PDCO)2(bbi)] (bbi = 1,1′-(1,4-butanediyl)bis(imidazole)) (9), were obtained under hydrothermal conditions and characterized structurally. The networks exhibit a variety of topologies and coordination modes at the metal centers. 1, 3, and 10 are isostructural and possess three-dimensional (3D) frameworks with penta-nuclear metal clusters as secondary building units (SBU). 5 and 7 individually exhibit a one-dimensional (1D) infinite chain and two-dimensional (2D) rectan...