The title complex, {[Cu2(C8H4O 4)2(C3H4N2) 4(H2O)˙H2O}n, is a three-dimensional polymer formed through bridging by phthalate dianions of two different CuII cations and a network of O(N)-H&mellip;O hydrogen bonds. The Cu-O and Cu-N interaction distances are in the ranges 2.0020 (16)-2.4835 (17) and 1.968(2)-1.9855 (19) A˚, respectively. The structure is composed of alternating polymer chains parallel to the c axis, with a shortest Cu&mellip;Cu distance of 6.3000 (5) A˚. ©2006 International Union of Crystallography.
