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PrOs2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Pr3+ is bonded in a 12-coordinate geometry to twelve equivalent Os+1.50- atoms. All Pr–Os bond lengths are 3.21 Å. Os+1.50- is bonded to six equivalent Pr3+ and six equivalent Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsPr6Os6 cuboctahedra. All Os–Os bond lengths are 2.74 Å.
PrOs2 is Hexagonal Laves structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Pr3+ is bonded in a 12-coordinate geometry to twelve Os+1.50- atoms. There are a spread of Pr–Os bond distances ranging from 3.17–3.26 Å. There are two inequivalent Os+1.50- sites. In the first Os+1.50- site, Os+1.50- is bonded to six equivalent Pr3+ and six equivalent Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsPr6Os6 cuboctahedra. All Os–Os bond lengths are 2.79 Å. In the second Os+1.50- site, Os+1.50- is bonded to six equivalent Pr3+ and six Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsPr6Os6 cuboctahedra. There are two shorter (2.64 Å) and two longer (2.76 Å) Os–Os bond lengths.