Poly[[di-μ(3)-nicotinato-μ(3)-oxalato-samarium(III)silver(I)] dihydrate]

In the title three-dimensional heterometallic complex, {[AgSm(C(6)H(4)NO(2))(2)(C(2)O(4))]·2H(2)O}(n), the Sm(III) ion is eight-coordinated by four O atoms from four different nicotinate ligands and four O atoms from two different oxalate ligands. The three-coordinate Ag(I) ion is bonded to two N atoms from two different nicotinate anions and one O atom from an oxalate anion. These metal coordination units are connected by bridging nicotinate and oxalate ligands, generating a three-dimensional network. The uncoordinated water mol­ecules link the carboxyl­ate groups via O—H⋯O hydrogen bonding. The crystal structure is further stabilized by hydrogen bonds between the water mol­ecules.