Hydrothermal synthesis and structure characterization of a 2D coordination polymer [Cu(ox) (4,4′-bpy)]n

Anew polymer [Cu(ox)(4,4'-bpy)](n)(1) (ox = C2O42-, 4,4'-bpy =4,4'-bipyridine) was hydrothermally synthesized and characterized via elemental analyses, IR spectrum and single crystal X-ray diffraction. The polymer crystallizes in a monoclinic system, space group Cm, a = 1.1921 (7) nm, b = 1.153 ( 7 nm, c =0. 5155(4) nm, beta = 113. 38(3)degrees, V=0. 6291(7) nm, Z =2. Cu atom in the title compound is in an octahedral geometry with four 0 atoms from two bis-chelating oxalate ligands in equatorial plane and two N atoms from the 4, 4'-bpy ligands in the axial, position. The crystal structure possesses infinite {Cu (ox)}(n) chains connected with each other by the bridging 4,4'-bpy ligands in a perpendicular manner, leading to a 2D layered network with rectangular grids. The layers stacking in a stagger ed fashion are further assembled by C-4,C-4'-bpy H center dot center dot center dot O-ox hydrogen bonds and lead to a 3D supramolecular architecture.