catena-Poly[[[ diaquacopper(II)]-bis[mu-1,5-bis (1H-imidazol-1-yl)pentane-kappa N-2(3):N-3']] naphthalene-1,5-disulfonate]

In the title complex, {[Cu(C11H16N4)(2)(H2O)(2)](C10H6O6S2)}n, the Cu-II atom, lying on an inversion center, is six-coordinated by two water molecules and four N atoms from four 1,5bis(1H-imidazol-1-yl)pentane (biim-5) ligands in a distorted octahedral geometry. Adjacent Cu-II atoms are linked by two biim-5 ligands, forming a chain along [111]. Two atoms of the pentane group are disordered over two sets of sites, with an occupancy ratio of 0.554 (18):0.446 (18). Intermolecular O-H center dot center dot center dot O hydrogen bonds link the chains and the centrosymmetric naphthalene-1,5-disulfonate anions into a layer structure parallel to (0 (1) over bar1).