Syntheses and crystal structures of the complexes of transition metal with 4,4′-bipyridine

Reactions of transition metal picrates with 4,4'-bipyridine gave two complexes [Zn(4,4'-bpy)(2)-(H2O)(2)](Pic)(2). (4,4'-bpy) . (H2O) (1) and [ Cu(4,4'-bpy)(Pic)(2)] (2) (4,4'-bpy = 4,4'-bipyridine, pic(-) picric anion),which were characterized by elemental analysis, IR spectroscopy and X-ray diffraction. Complex 1 crystallizes in the monoclinic space group C-c with cell parameters a = 2.271 6(2) nm, b = 1.619 1 (3) nm, c = 1.616 6(2) nm, beta = 131.085(7)degrees, V = 4.481(2) nm(3), Z = 4. An infinite 2-D network structure of the complex was constructed by coordination of zinc to 4, 4'-bpy. The most interesting feature is that the 2-D network is extended into 3-D network structures by uncoordinated 4,4'-bpy via hydrogen bonds along the a axis. All the uncoordinated 4, 4'-bpy, picric anion and water molecles are clathrated in the network, exhibiting a certain inclusion phenomenon. Complex 2 crystallizes in the triclinic space group P (1) over bar with cell parameters a = 0.610 0(2) nm, b = 1.018 6(3) nm, c = 1.104 6(2) nm, alpha = 107.230(10)degrees, beta = 101.992(2)degrees, gamma = 97.87(7)degrees, V = 0.626 6(3) nm(3), Z = 1. In the complex, the coordination of copper cation to 4,4'-bipyridine and picric anion simultaneously results in the infinite one dimensional 4, 4'-bpy-bridged polymeric [Cu(4,4'-bpy) (Pic)(2)] chains.