Crystal structure of poly[aqua­[μ-1,1′-(9,9-dimethyl-9H-fluoren-2,7-di­yl)di-1H-imidazole](μ-naphthalene-1,4-di­carboxyl­ato)nickel(II)]

In the title compound, [Ni(C(12)H(6)O(4))(C(21)H(18)N(4))(H(2)O)](n), the Ni(II) cation is coordinated by three carboxyl­ate O atoms of two naphthalene-1,4-di­carboxyl­ate anions, one water mol­ecule and two N atoms of two 1,1′-(9,9-dimethyl-9H-fluoren-2,7-di­yl)di-1H-imidazole (DFDI) ligands, giving rise to a slightly distorted octa­hedral geometry. The Ni(II) ions are linked by the DFDI ligands into chains, which are further connected by the carboxyl­ate anions into double chains that elongate in the the b-axis direction. These double chains are linked by centrosymmetric pairs of O—H⋯O hydrogen bonds into layers parallel to (10-1). The asymmetric unit consists of one crystallographically independent Ni(II) cation, one carboxyl­ate and one DFDI ligand, as well as of one water mol­ecule, all of them located in general positions.