Poly[[[μ-1,4-bis-(pyridin-4-ylmeth-yl)piperazine][μ-4-(2-carboxyl-atoeth-yl)benzoato]copper(II)] monohydrate], a coordination polymer with twofold inter-penetrated cds topology networks.

The title compound, {[Cu(C(10)H(8)O(4))(C(16)H(20)N(4))]·H(2)O}(n), contains square-planar coordinated Cu(II) ions linked by 4-(carboxyl-atoeth-yl)benzoato (ceb) and 1,4-bis-(pyridin-4-ylmeth-yl)piperazine (bpmp) ligands into a tri-periodic coordination polymer with twofold inter-penetrating 6(5)8 cds topology. Positional crystallographic disorder among the copper atoms, the ethyl-carb-oxy group of the ceb ligands, and the water mol-ecules of crystallization exists in a refined 0.655†(6)/0.345†(6) ratio.