Poly[tetra­kis­(dimethyl­formamide)tris(μ4-terephthalato)trimagnesium]

The title framework compound, [Mg 3 (C 8 H 4 O 4 ) 3 (C 3 H 7 NO) 4 ] n or [Mg 3 (bdc) 3 (DMF) 4 ] n , was obtained as a side product of the solvothermal reaction of magnesium nitrate, terephthalic acid (bdcH 2 ), and 1,3-bis­(4-pyrid­yl)propane in a 1:2:1 ratio in dimethyl­formamide (DMF). The asymmetric unit consists of three Mg II cations, three terephthalate anions, and four coordinating DMF mol­ecules. One of the four DMF mol­ecules was refined as disordered over two mutually exclusive positions, with an occupancy rate for the major moiety of 0.923 (4). The three Mg II cations possess distorted octa­hedral coordination geometries that form linear Mg trimers. Of the three Mg II cations, the central Mg II is octa­hedrally coordinated by six different carboxyl­ate O atoms. The terminal Mg II cations are bonded to four O atoms of three bdc linkers and to two O atoms of coordinating DMF mol­ecules. The compound has a two-dimensional 3 6 -network structure parallel to (001) that is formed by connection of the Mg trimers as distorted octa­hedral nodes to the bdc ligands as linkers.