Polymeric di­aqua­bis­[μ4‐1,3,5‐benzenetri­carboxyl­ato(3–)](μ‐4,4′‐bi­pyridine)­trizinc(II)

The solvothermal reaction of zinc(II) acetate with 1,3,5‐benzene­tri­carboxyl­ic acid and 4,4′‐bi­pyridine in 1‐butanol and acetic acid solution gives the title complex, Zn₃(C₉H₃O₆)₂(C₁₀H₈N₂)(H₂O)₂]_n. There are two different coordination environments for the Zn atom, namely ZnNO₂(H₂O) and ZnO₄; in the latter case, the Zn atom lies on a twofold symmetry axis. Carboxyl­ate‐bridged Zn₃(O₂C)₆ clusters are connected through 1,3,5‐benzene­tri­carboxyl­ate and 4,4′‐bi­pyridine ligands (which lie about inversion centers), yielding a three‐dimensional framework.