Copper(II) Complexes with 4,4′-Bipyridine: From 1D to 3D Lattices

Three new Cu(II) coordination polymers with 4,4′-bipyridine (bpy) were synthesized by hydrothermal reactions and their structures determined by single crystal X-ray diffraction. [Cu(bpy)3(H2O)2](bpy)(PF6)2(H2O)3 (1) is built from bpy-bridged chains, [Cu(bpy)2(H2O)2](bpy)(PF6)2(H2O)6 (2) from layers, and in [Cu(bpy)2(NO3)](bpy)(PF6)2(H3O)(H2O) (3) the layers are further connected by nitrate to a cuboid lattice. The magnetic properties of 3 are compared to [Cu(bpy)2(H2O)2](SiF6) (4) and [Cu(pyz)(bpy)(H2O)2](PF6)2 (5), where pyz = pyrazine. 3–5 are weakly coupled two-dimensional S = 1/2 antiferromagnetic Heisenberg lattices with 0.86 K < J < 1.47 K.