Two-dimensional monovalent copper halide coordination polymers incorporating anti-conformation 3,3′-bipyridine

Hydrothermal treatment of aqueous mixtures of copper(II) halides and 3,3′-bipyridine (3,3′-bpy) has afforded the coordination polymers [CuCl(3,3′-bpy)]_n (1) and [Cu₂Br₂(3, 3′-bpy)]_n (2), which were analyzed via single crystal X-ray diffraction, infrared spectroscopy, and elemental analysis. The structure of 1 consists of two-dimensional (2-D) layers constructed from the linkage of castellated one-dimensional (1-D) [CuCl]_n stepped chains through anti-conformation 3,3′-bpy tethers. Compound 2 presents a related 2-D sheet motif, albeit built from infinite 1-D [Cu₂Br₂] _n ladders strutted by 3,3′-bpy ligands in anti conformation. In both cases neighboring 2-D sheets stack into 3-D via weak C-H⋯halogen interactions.