Poly[bis­(N,N-dimethyl­formamide)(μ-formato)(μ(5)-4-oxidoisophthalato)dizinc(II)]

The title compound, [Zn(2)(CHO(2))(C(8)H(3)O(5))(C(3)H(7)NO)(2)](n), is a three-dimensional metal–organic framework, of which two independent Zn(II) atoms (denoted Zn1 and Zn2) are linked by both 4-oxidoisophthalate and formate bridging ligands. The 4-oxidoisophthalate ligands link two Zn1-type and three Zn2-type atoms, forming a corrugated sheet roughly parallel to the ac plane. The formate ions join two neighboring sheets along the b axis, forming a three-dimensional network. Two independent dimethylformamide ligands are coordinated to separate Zn(II) atoms and fill the voids provided by the framework. Both types of Zn(II) atoms have a distorted trigonal-bipyramidal coordination geometry.