Synthesis of catena-Poly[[di-aqua(2,2′-bipyridine)copper(II)]-μ-sulfato-κ2O:O'] 1D coordination polymer and [di-chloro(2,2′-bipyridine)copper(II)] complex, redetermination of their crystal structures

The title compounds [Cu(bpy)(H2O)2(SO4)]n (1) and [Cu(bpy)Cl2] (2) were successfully synthesized, and their crystal structures were redetermined as some corrections were needed. The Cu(II) centers in 1 are coordinated in elongated octahedral geometry by the two nitrogen atoms of a bpy ligand and four oxygen atoms belonging to aqua molecules and sulfato ligands, forming a polymeric chain by bridging the sulfato ligands. The Cu(II) center in 2 is coordinated by the two chloride ions and the two nitrogen atoms of the bipyridine ligand, forming a distorted square planar geometry. The [Cu(bpy)(H2O)2(SO4)]n complex crystallizes in the monoclinic crystal system with space group C2/c. The unit cell parameters were determined to be a = 15.154(3) Å, b = 12.477(3) Å, c = 7.0158(14) Å, α = 90°, β = 105.873(12)°, γ = 90°, V = 1276.0(5) Å3, Z = 4. The Cu–N, Cu–O(aqua) and Cu–O(sulfate) bond lengths are 2.000(3) Å, 1.978(2) Å and 2.464(2) Å, respectively. The [Cu(bpy)Cl2] complex crystallizes in the monoclinic crystal system with space group I2/a. The unit cell parameters were determined to be a = 7.306(2) Å, b = 9.016(2) Å, c = 15.879(6) Å, α = 90°, β = 92.141(15)°, γ = 90°, V = 1045.2(5) Å3, Z = 4. The Cu–N and Cu–Cl bond lengths are 2.031(5) Å and 2.2662(17) Å, respectively.