catena-Poly[[cis-diaqua­(1,10-phenanthroline-κ²N,N′)cobalt(II)]-μ₂-5-sulfonatosalicylato-κ²O:O′]

In the title one-dimensional chain complex, [Co(C₇H₄O₆S)(C₁₂H₈N₂)(H₂O)₂]_n, each Co^II atom displays an octa­hedral geometry. Hydrogen-bonding inter­actions between chains generate a two-dimensional architecture.