Bis[μ-2,5-bis­(pyridin-2-yl)-1,3,4-thia­diazole-κ(4) N (2),N (3):N (4),N (5)]bis­[(nitrato-κO)silver(I)] tetra­hydrate

The self-assembly of an angular 2,5-bis­(pyridin-2-yl)-1,3,4-thia­diazole ligand (L) with silver nitrate (AgNO(3)) produced a new dinuclear silver(I) coordination complex, [Ag(2)(C(12)H(8)N(4)S)(2)(NO(3))(2)]·4H(2)O, which crystallizes with two Ag atoms bridged by two L ligands. The Ag atom is surrounded by four N atoms of L and by one O from the nitrate anion defining a distorted square pyramid. The atoms comprising the dication are nearly coplanar, with an r.m.s. deviation of 0.1997 Å. Mol­ecules are linked by C—H⋯O and O—H⋯O hydrogen bonds through nitrate anions and water mol­ecules, forming a two-dimensional porous network. The overall structure involves stacking of Ag complex layers along the b axis. The cohesion in the three-dimensional architecture is ensured by O⋯Ag inter­actions.