Synthesis and characterization of new coordination polymers generated from oxadiazole-containing ligand and inorganic M(II) [M = Cu(II), Co(II)] salts

The coordination chemistry of the oxadiazole-containing ligand 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (L5) with inorganic Cu(II) and Co(II) salts has been investigated. Three new coordination polymers (1-3) and one H-bonded polymer (4) were prepared by solution reactions. [Cu(L5)(H2O) (SO4)]·2(H2O)(1) adopts a novel chiral three-dimensional motif with rhombus channels (ca. 6.04 × 14.09 ). [Co(L5)(CH3OH)2(SO4)](CH3OH)(H2O) 3.5(2) features a novel two-dimensional network. [Cu(L5)2(H2O)2](L5)2(ClO4)2(CH3OH)(H2O)(3) features a two-dimensional rhombus-grid-type layer with inner grid cavity dimensions of 13.22 × 13.22 2. Compound 4, however, is a molecular complex that is bound together by strong NH-O and OH-O hydrogen bonds into a three-dimensional H-bonded network.