Different Structural Networks Determined by Variation of the Ligand Skeleton in Copper(II) Diphosphinate Coordination Polymers

A new polymeric copper(II)−organic framework, [[Cu(4,4′-bipy)(p(xyl)p)(H2O)2]·2(H2O)]n (1; p(xyl)p = P,P′-diphenyl-p-xylenediphosphinate, 4,4′-bipy = 4,4′-bipyridine), has been synthesized. Single-crystal X-ray diffraction revealed that the structure of 1 consists of 2D grids connected by solvent water molecules. The temperature-dependent X-ray powder diffraction analysis of 1 has shown the formation of a dehydrated phase well modeled by a 3D structure with a binodal 4,6 connected topology.