Sodium 2-oxo-3-semicarbazono-2,3-dihydro-1H-indole-5-sulfonate dihydrate

Poly[diaqua(μ3-2,3-dioxoindoline-5-sulfonato)sodium]

The title compound, [Na(C8H4NO5S)(H2O)2] n , is a one-dimensional coordination polymer extending along the c axis. It consist of isatin sulfonate molecules linking pairs of sodium cations with Na—O bonds to both carbonyl and sulfonate oxygen atoms whereby two oxygen atoms of symmetry-related carbonyl groups bridge two sodium cations. The sodium cation possesses an octahedral coordination environment, including one sulfonate and three carbonyl oxygen atoms bound in the equatorial plane, and two water molecules bound axially. The isatin moiety of the organic ligand is nearly planar, with a mean deviation from planarity of 0.038 Å. The chains of the coordination polymer are further linked into a three-dimensional network with eight distinct interactions, including one N—H...O and four O—H...O hydrogen bonds, two C—H...O interactions and one π–π interaction.