Poly[(μ-benzene-1,2,4,5-tetracarboxylato)tetrasilver(I)]

In the centrosymmetric title compound, [Ag4(C10H2O8)]n, the benzene ring has irregular bond lengths but remains planar (r.m.s. deviation 0.0002 Å). The Ag—O bond lengths are in the range 2.153 (3)–2.615 (4) Å. The carboxylate groups are oriented at dihedral angles of 26.4 (5) and 74.9 (4)° to the benzene ring. The coordination behaviour of each carboxylate O atom is different: in one carboxylate, the O atoms are coordinated to a single and two Ag atoms; in the other carboxylate, the O atoms are coordinated to two and three Ag atoms. Non-classical intermolecular C—H...O hydrogen bonding is present in the crystal structure. The title compound forms a three-dimensional polymeric network due to the coordination of the Ag atoms.