Poly[aqua­(μ(11)-4,6-dihy­droxy­benzene-1,3-disulfonato)­dipotassium]

In the title salt, [K(2)(C(6)H(4)O(8)S(2))(H(2)O)](n), both K(+) ions exhibit a seven-coordination with K—O bond lengths in the range 2.6600 (14) to 3.0522 (16) Å. One K(+) ion is coordinated by seven O atoms from the sulfonate and phenolic hy­droxy groups of six 4,6-dihy­droxy­benzene-1,3-disulfonate (L (2−)) anions while the other K(+) ion is coordinated by six O atoms from the sulfonate and phenolic hy­droxy groups of five L (2−) anions and one water O atom. The L (2−) anion exhibits chelating–bridging multidentate coordination to potassium, resulting in the formation of a cross-linked three-dimensional network.