Poly[bis­(μ(6)-benzene-1,3,5-tricarboxyl­ato-κ(7) O (1),O (1′):O (1′):O (3):O (3′):O (5):O (5′))tetra­kis­(dimethyl­formamide-κO)trimagnesium(II)]

The asymmetric unit of the polymeric title compound, [Mg(3)(C(9)H(3)O(6))(2)(C(3)H(7)NO)(4)](n), contains three Mg(II) ions bridged by carboxyl­ate O atoms from two fully deprotonated benzene-1,3,5-tricarboxyl­ate (BTC) trianions and four metal-coordinated dimethyl­formamide (DMF) mol­ecules. One Mg(II) ion is octa­hedrally coordinated by six carboxyl­ate O atoms. The other two cations are each octa­hedrally coordinated by four carboxyl­ate O atoms and two O atoms donated by two DMF mol­ecules: in one, the DMF mol­ecules are cis and in the other they are trans. The three Mg(II) octa­hedra form clusters, which are bridged by the BTC trianions, generating a three-dimensional structure.