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In the centrosymmetric title compound, [Ag 4 (C 10 H 2 O 8 )]  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.

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