Nonaaqua­praseodymium triiodide-thio­urea (1/2)

The title compound, [Pr(H₂O)₉]I₃·2CS(NH₂)₂, an adduct of nona­aqua­praseodymium triiodide with two thio­urea mol­ecules, is composed from [Pr(H₂O)₉]³⁺ cations (polyhedron: monocapped tetra­gonal anti­prism), noncoordinated thio­urea mol­ecules and iodide anions. The components are evidently connected by hydrogen bonds but in the presence of heavy atoms water H atoms have not been located. The complex cation and one of the two independent iodide anions are located on a twofold axis.