catena-Poly[[[aqua­copper(II)]-bis­[μ-N,N′-bis­(pyridin-4-yl)isophthalamide]-[aqua­copper(II)]-di-μ-sulfato] dimethyl­formamide disolvate]

In the title coordination polymer, {[Cu(SO(4))(C(18)H(14)N(4)O(2))(H(2)O)]·C(3)H(7)NO}(n), the Cu(II) ion is coordinated by two N atoms of two briding N,N′-bis­(pyridin-4-yl)isophthalamide ligands, two O atoms of two bridging SO(4) (2−) anions and a water mol­ecule, giving a distorted CuN(2)O(3) square-pyramidal geometry. The whole repeating mol­ecular unit is generated by inversion symmetry. This leads to the formation of a looped-chain one-dimensional coordination polymer propagating along [110]. The dimethyl­formamide (DMF) mol­ecules are linked to the chains via O—H⋯O hydrogen bonds. The chains are linked via N—H⋯O hydrogen bonds, forming two-dimensional networks parallel to (001). There are also a number of C—H⋯O inter­actions present and a parallel slipped π–π inter­action. The latter involves inversion-related pyridine rings with a centroid–centroid distance of 3.594 (2) Å [normal distance = 3.3338 (13) and slippage = 1.341 Å]. These inter­actions lead to the formation of a three-dimensional structure.