catena-Poly[bis[(2,2-bipyridine-κ2N,N′)copper(II)]-μ4-1,2,4,5-benzenetetracarboxylato-κ4O1:O2:O3:O4]

In the title complex, [Cu-2(C10H2O8)(C10H8N2)(2)](n), the Cu-II cation has a four-coordinated environment, completed by two carboxyl O atoms belonging to two 1,2,4,5-benzenetetracarboxylate anions (TCB4-) and two N atoms from one 2,2'-bipyridine (2,2'-bipy) ligand, forming a distorted square-planar geometry. The [Cu(2,2'-bipy)](2+) moieties are bridged by TCB4- anions, which lie about inversion centres, forming an infinite one-dimensional coordination polymer with a double-chain structure along the a axis. A two-dimensional network structure is formed via a face-to-face pi-pi interaction between the 2,2'-bipy rings belonging to two adjacent double chains, at a distance of approximately 3.56 Angstrom.