Poly[propane-1,3-diammonium [cuprate(II)-bis-(μ2-pyridine-2, 3-dicarboxylato)] trihydrate]

Abstract

The title polymeric compound {(C3H12N2)[Cu(C7H3NO4)2]·3H2O} n or {(pnH2)[Cu(py-2,3-dc)2]·3H2O} n (pn is propane-1,3-diamine and py-2,3-dcH2 is pyridine-2,3-dicarboxylic acid), was synthesized by reaction of copper(II) chloride dihydrate with a proton-transfer compound, propane-1,3-diammonium pyridine-2,3-dicarboxyl-ate or (pnH2)(py-2,3-dc), in aqueous solution. The anion is a six-coordinate complex (site symmetry ), with a distorted octa-hedral geometry around CuII, consisting of two bidentate pyridine-2,3-dicarboxyl-ate groups and two O atoms of bridging ligands from (py-2,3-dc)2- fragments, which are located in trans positions. The (pnH2)2+ cation is disordered over two sites by the center of inversion. Inter-molecular hydrogen bonds, π-π [centroid-centroid distances of 3.539 (3) Å] and C - O⋯π stacking inter-actions [O⋯Cg = 3.240 (5) Å; Cg is the center of the pyridine ring], connect the various components into a supra-molecular structure. © 2008 International Union of Crystallography.