Poly[[(μ4-benzene-1,3,5-tricarboxylato-κ4O1:O1':O2:O3)bis(2,2-bipyridine-κ2N,N')(μ2-hydroxido)dicopper(II)] trihydrate

In the two-dimensional coordination polymer, {[Cu2(C9H3O6)(OH)(C10H8N2)2]_3H2O}n, each of the two independent CuII atoms is coordinated by a bridging OH group, two O atoms from two benzene-1,3,5-tricarboxylate (L) ligands and two N atoms from a 2,2- bipyridine (bipy) ligand in a distorted square-pyramidal geometry. Each L ligand coordinates four CuII atoms, thus forming a polymeric layer parallel to the bc plane with bipy molecules protruding up and down. The lattice water molecules involved in O—H...O hydrogen bonding are situated in the inner part of each layer. The crystal packing is consolidated by pi–pi interactions between the aromatic rings of bipy ligands from neighbouring layers [intercentroid distance = 3.762 (3) A ˚ ].