Poly[di­methyl­ammonium [(μ(2)-benzene-1,2-di­carboxyl­ato-κ(2) O (1):O (3))[μ(2)-3-(pyri­din-4-yl)-1H-pyrazol-1-ido-κ(2) N (1):N (3)]cuprate(II)]]

In the title complex, {(C(2)H(8)N)[Cu(C(8)H(4)O(4))(C(8)H(6)N(3))]}(n), there are two Cu(II) cations (each located on a centre of inversion), one benzene-1,2-di­carboxyl­ate dianion, one 3-(pyridin-4-yl)-1H-pyrazol-1-ide anion and one di­methyl­ammonium cation in the asymmetric unit. The di­methyl­ammonium cation was highly disordered and was treated with the SQUEEZE routine in PLATON [Spek (2009 ▶). Acta Cryst. D65, 148–155]; the crystallographic data takes into account the presence of the cation. Each Cu(II) cation exhibits a square-planar coordination geometry. A benzene-1,2-di­carboxyl­ate dianion bridges two Cu(II) cations, building a linear chain along [001]. The chains are connected by 3-(pyridin-4-yl)-1H-pyrazol-1-ide anions, constructing a layer parallel to (101). The layers are assembled into a three-dimensional supra­molecular network through C—H⋯π inter­actions.