A novel alkaline earth strontium(II) coordination polymer: poly[hexa­aqua­tetra­kis­([mu]₅-pyridine-2,6-di­carboxyl­ato)bis­([mu]₄-pyridine-2,6-di­carboxyl­ato)([mu]₇-sulfato)­hepta­strontium(II)]

The title compound has been synthesized by an ionothermal method. The compound not only exhibits a three-dimensional structure with a unique coordination mode of the sulfate anion, but also features the first example of a hepta­nuclear strontium(II) coordination polymer.