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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 mol­ecules, 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 mol­ecule 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.

Poly[μ2-aqua-aqua-μ5-naphthalene-2,7-disulfonato-strontium]

Poly[μ₂-aqua-aqua-μ₅-naphthalene-2,7-disulfonato-strontium]