(μ-5-Carboxy­benzene-1,3-dicarboxyl­ato-κ(2) O (1):O (3))bis­[bis­(2,2′-bipyridine-κ(2) N,N′)copper(II)] 5-carboxy­benzene-1,3-dicarboxyl­ate 2,2′-bipyridine solvate trideca­hydrate

The asymmetric unit of the title complex, [Cu(2)(C(9)H(4)O(6))(C(10)H(8)N(2))(4)](C(9)H(4)O(6))·C(10)H(8)N(2)·13H(2)O, comprises two formula units. The two Cu(II) centres are bridged by a 5-carb­oxy­benzene-1,3-dicarboxyl­ate (Hbtc) ligand. Each of the metal centres is bonded to four N atoms of two bidentate 2,2′-bipyridine ligands (bpy) and one O atom of the Hbtc ligand in a highly distorted square-pyramidal geometry. The secondary structure is stabilized by a variety of O—H⋯O hydrogen bonds and π–π stacking inter­actions connecting the complex cations, Hbtc anions, bpy and water mol­ecules of crystallization. Three water molecules are disordered over two positions, with site occupancy factors of ca 0.8 and 0.2.