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In the title lanthanum complex, {[La(C4H4O5)(H2O)3]NO3}n, the lanthanum cation is immersed in a nine-coordinate environment provided by a tridentate oxydiacetate (oda) ligand (through two carboxyl­ate and one ether O atoms), three carboxyl­ate O atoms from neighbouring oda ligands and three aqua ligands. The LaO9 polyhedra are inter­linked into a tight three-dimensional framework, which leaves holes where the nitrate anions lodge. The links to the polymeric framework are by an extensive hydrogen-bonding scheme utilizing all the water H atoms. Thermogravimetric analysis shows that the three coordinated water mol­ecules leave the structure in two well differentiated steps.

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This new hydrate of barium acetate presents six independent barium centres, 12 independent acetate ligands and three complete and one disordered aqua molecule to generate a tight three-dimensional structure in which extensive hydrogen bonding is present.
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