Abstract

The six-membered ring of the 3,5-dinitropyridin-4-olate anion in the title dihydrated sodium derivative, Na+·C5H2N3O5−·2H2O, exists in the pyridone form with C=C and C=O double bonds, and the negative charge formally residing on the N atom. The anions link the Na+ ions, each of which is coordinated by four water mol­ecules, into a linear chain that runs along the c axis of the unit cell. The chains are bridged by the water mol­ecules into a sheet structure. The anion and the Na+ ion lie on a mirror plane.

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