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The structure of tetra­aqua­[2,6-di­acetyl­pyridine bis­(semicarbazone)]samarium(III) trinitrate, [Sm(C11H15N7O2)(H2O)4](NO3)3, has monoclinic (P21/c) symmetry. The 2,6-di­acetyl­pyridine (DAPSC) ligand is penta­dentate. The coordination of the DAPSC ligand and four coordinated water mol­ecules around the metal cation is best described as a distorted tricapped trigonal prism. The structure displays inter­molecular hydrogen bonding. The structure is isomorphous with many other published lanthanide(III) nitrate salts with the DAPSC ligand, 2,6-di­acetyl­pyridine­bis­(semicarbazone). One of the three nitrate counter-anions is disordered, which is consistent with the structures of other +3 lanthanide nitrate salts with DAPSC. Refinement of occupancies for the disordered nitrate group gave major and minor occupancies of 54.9 (14) and 45.1 (14)%, respectively.

Tetraaqua[2,6-diacetylpyridine bis(semicarbazone)]samarium(III) trinitrate