Synthesis, Structure and Magnetic Properties of a New Two-dimensional (4,4) Network Cobalt Coordination Polymer with Dicyanamide and Benzimidazole Ligands

The new cobalt(II) coordination polymer [Co(bim) 2 (dca) 2 ] n ( 1 ), (bim = benzimidazole, dca = dicyanamide) was synthesized and characterized. X-ray diffraction analyses reveal that the title complex crystallizes in the monoclinic space group P 2 1 /n with a = 9.168(5), b = 9.959(5), c = 9.850(5) Å, β = 105.360(11) o , Z = 2, and R 1 = 0.0308, wR 2 = 0.0728. The coordination geometry of cobalt atom is distorted octahedral, coordinated equatorially by four nitrogen atoms from four dicyanamide ligands, and axially by two nitrogen atoms from two benzimidazole molecules. Each dca ligand links two cobalt(II) atoms and 1 forms a two-dimensional (4,4) network. The spectroscopic and magnetic properties have also been investigated. Graphical Abstract The new cobalt(II) coordination polymer [Co(bim) 2 (dca) 2 ] n ( 1 ), (bim = benzimidazole, dca = dicyanamide) was synthesized and characterized by X-ray diffraction analyses. The coordination geometry of cobalt atom is distorted octahedral, coordinated equatorially by four nitrogen atoms from four dicyanamide ligands, and axially by two nitrogen atoms from two benzoimidazole molecules. Each dca ligand links two cobalt(II) atoms and 1 forms a two-dimensional (4,4) network. The spectroscopic and magnetic properties have also been investigated.