Pyridinium [2,6-bis-(5-phenyl-1H-pyrazol-3-yl-κN)pyridine-κN]tetra-nitrato-κO,O';κO-samarium(III) pyridine monosolvate.

In the title compound, (C(5)H(6)N)[Sm(NO(3))(4)(C(23)H(17)N(5))]·C(5)H(5)N, the Sm(III) atom is ten-coordinated by the N,N',N''-tridentate bis-(pyrazole) ligand and seven O atoms from four nitrate anions (three bidentate and one monodentate). The dihedral angles between the central pyridine ring and adjacent pyrazole rings in the ligand are 1.3 (2) and 3.2 (2)°; the dihedral angles between the pyrazole rings and their pendant phenyl rings are 42.0 (3) and 16.1 (2)°. The conformation of the anionic complex ion is supported by an intra-molecular N-H⋯O hydrogen bond. In the crystal, inversion dimers linked by pairs of N-H⋯O hydrogen bonds occur. The pyridinium cation forms an N-H⋯N hydrogen bond.