Supramolecular sheet Co(II) complex assembled by hydrogen bond

The title complex, [[Co(Py)₂(H₂O)₂ (NO₃)₂]]_n (1) was synthesized by liquid/liquid diffusion method at room temperature. The complex crystallizes in monoclinic, space group P2(1)/C, with a=0.8775(6) nm, b=1.1715(8) nm, c=0.7518(5) nm, V=0.7393(9) nm³, C₁₀H₁₄CoN₄O₈, M_r=377.18, D_c=1.694 g/cm³, μ=1.210 mm^-1, F(000)=386, Z=2, the final R=0.0229 and wR=0.0661 for 3137 observed reflections (I>2σ(I)). In the structure of 1, the center atom of cobalt revealed a centrosymmetric, six-coordinate structure, with two Py ligands, two monodentate nitrate groups and two water molecules. It is notable that a series of hydrogen bonds (O-H⋯O) formed two kinds of rings exist in the structure, which linked neighboring six-coordinate polymer into a two-dimensional H-bonding network, and then assembled into a three-dimensional supramolecular architecture through electrostatic and hydrophobic interaction. In the structure, supramolecular sheet was observed, which contains alternative organic and inorganic layers. Copyright Protection.