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In the title compound, [Na(H 2 O) 4 ](C 15 H 9 N 2 O 2 ), the Na +  ion is coordinated by six water mol­ecules in an octa­hedral geometry. The NaO 6  octa­hedra are connected by sharing edges, forming a cationic chain along the  b -axis direction. O—H⋯O and O—H⋯N hydrogen bonds link the chains and the 2-(2-pyrid­yl)quinoline-4-carboxyl­ate anions into a two-dimensional network parallel to (100).

catena-Poly[[[diaquasodium]-di-μ-aqua] 2-(2-pyridyl)quinoline-4-carboxylate]