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In the title complex, [La(C 6 H 4 NO 3 )(C 2 O 4 )(H 2 O) 2 ]  n  , the La III  ion is coordinated by eight O atoms from two 2-oxido­pyridinium-3-carboxyl­ate ligands, two oxalate ligands and two water mol­ecules in a distorted bicapped square-anti­prismatic geometry. The carboxyl­ate groups link adjacent La III  ions, forming two-dimensional layers that are further linked by N—H⋯O and O—H⋯O hydrogen bonds.

Poly[diaqua(μ-oxalato)(μ-2-oxidopyridinium-3-carboxylato)lanthanum(III)]