ThPt2 crystallizes in the tetragonal I4/mmm space group. Th(1) is bonded in a 9-coordinate geometry to four equivalent Pt(1) and five equivalent Pt(2) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Th(1), four equivalent Pt(1), and four equivalent Pt(2) atoms to form distorted PtTh4Pt8 cuboctahedra that share corners with four equivalent Pt(1)Th4Pt8 cuboctahedra, corners with four equivalent Pt(2)Th5Pt4 square pyramids, edges with eight equivalent Pt(2)Th5Pt4 square pyramids, faces with eight equivalent Pt(1)Th4Pt8 cuboctahedra, and faces with four equivalent Pt(2)Th5Pt4 square pyramids. In the second Pt site, Pt(2) is bonded to five equivalent Th(1) and four equivalent Pt(1) atoms to form distorted PtTh5Pt4 square pyramids that share corners with four equivalent Pt(1)Th4Pt8 cuboctahedra, corners with eight equivalent Pt(2)Th5Pt4 square pyramids, edges with eight equivalent Pt(1)Th4Pt8 cuboctahedra, edges with four equivalent Pt(2)Th5Pt4 square pyramids, faces with four equivalent Pt(1)Th4Pt8 cuboctahedra, and faces with five equivalent Pt(2)Th5Pt4 square pyramids.
ThPt2 crystallizes in the tetragonal I4/mmm space group. Th(1) is bonded in a 9-coordinate geometry to four equivalent Pt(1) and five equivalent Pt(2) atoms. All Th(1)-Pt(1) bond lengths are 3.08 Å. There are four shorter (2.98 Å) and one longer (3.00 Å) Th(1)-Pt(2) bond length. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to four equivalent Th(1), four equivalent Pt(1), and four equivalent Pt(2) atoms to form distorted PtTh4Pt8 cuboctahedra that share corners with four equivalent Pt(1)Th4Pt8 cuboctahedra, corners with four equivalent Pt(2)Th5Pt4 square pyramids, edges with eight equivalent Pt(2)Th5Pt4 square pyramids, faces with eight equivalent Pt(1)Th4Pt8 cuboctahedra, and faces with four equivalent Pt(2)Th5Pt4 square pyramids. All Pt(1)-Pt(1) bond lengths are 2.96 Å. All Pt(1)-Pt(2) bond lengths are 2.87 Å. In the second Pt site, Pt(2) is bonded to five equivalent Th(1) and four equivalent Pt(1) atoms to form distorted PtTh5Pt4 square pyramids that share corners with four equivalent Pt(1)Th4Pt8 cuboctahedra, corners with eight equivalent Pt(2)Th5Pt4 square pyramids, edges with eight equivalent Pt(1)Th4Pt8 cuboctahedra, edges with four equivalent Pt(2)Th5Pt4 square pyramids, faces with four equivalent Pt(1)Th4Pt8 cuboctahedra, and faces with five equivalent Pt(2)Th5Pt4 square pyramids.