Poly[μ(2)-aqua-aqua-μ(5)-naphthalene-2,7-disulfonato-strontium].

In the crystal structure of the polymeric title compound, [Sr(C(10)H(6)O(6)S(2))(H(2)O)(2)](n), the naphthalene-2,7-disulfonate dianion uses one -SO(3) unit to bind to two Sr(II) cations and the other -SO(3) unit to bind to three Sr(II) cations; of the two coordinated water mol-ecules, one is monodentate to one Sr(II) cation, whereas the other bridges two Sr(II) cations. The μ(5)-bridging mode of the dianon and the μ(2)-bridging mode of the water mol-ecule generate a polymeric three-dimensional network which is consolidated by O-H⋯O hydrogen bonds. The Sr(II) cation exists in an undefined eight-coordinate environment.