catena-Poly[[[diaqua­copper(II)]-bis­[μ-1,5-bis­(1H-imidazol-1-yl)pentane-κ(2) N (3):N (3′)]] naphthalene-1,5-disulfonate]

In the title complex, {[Cu(C(11)H(16)N(4))(2)(H(2)O)(2)](C(10)H(6)O(6)S(2))}(n), the Cu(II) atom, lying on an inversion center, is six-coordinated by two water mol­ecules and four N atoms from four 1,5-bis­(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⋯O hydrogen bonds link the chains and the centrosymmetric naphthalene-1,5-disulfonate anions into a layer structure parallel to (0-11).