UCe(Pt4Au)2 crystallizes in the trigonal R3m space group. U(1) is bonded in a 16-coordinate geometry to three equivalent Pt(1), three equivalent Pt(3), six equivalent Pt(2), one Au(2), and three equivalent Au(1) atoms. Ce(1) is bonded in a 16-coordinate geometry to three equivalent Pt(2), three equivalent Pt(4), six equivalent Pt(1), one Au(1), and three equivalent Au(2) atoms. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one U(1), two equivalent Ce(1), one Pt(3), one Pt(4), four equivalent Pt(1), one Au(2), and two equivalent Au(1) atoms to form PtCe2UPt6Au3 cuboctahedra that share corners with two equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, corners with two equivalent Pt(3)U3Pt6Au3 cuboctahedra, corners with four equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, corners with ten equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, edges with two equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, edges with four equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, faces with three equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, faces with three equivalent Pt(3)U3Pt6Au3 cuboctahedra, faces with four equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, and faces with eight equivalent Pt(1)Ce2UPt6Au3 cuboctahedra. In the second Pt site, Pt(2) is bonded to two equivalent U(1), one Ce(1), one Pt(3), one Pt(4), four equivalent Pt(2), one Au(1), and two equivalent Au(2) atoms to form PtCeU2Pt6Au3 cuboctahedra that share corners with two equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, corners with two equivalent Pt(3)U3Pt6Au3 cuboctahedra, corners with four equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, corners with ten equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, edges with two equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, edges with four equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, faces with three equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, faces with three equivalent Pt(3)U3Pt6Au3 cuboctahedra, faces with four equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, and faces with eight equivalent Pt(2)CeU2Pt6Au3 cuboctahedra. In the third Pt site, Pt(3) is bonded to three equivalent U(1), three equivalent Pt(1), three equivalent Pt(2), and three equivalent Au(1) atoms to form PtU3Pt6Au3 cuboctahedra that share corners with six equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, corners with six equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, corners with six equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, edges with six equivalent Pt(3)U3Pt6Au3 cuboctahedra, faces with nine equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, and faces with nine equivalent Pt(2)CeU2Pt6Au3 cuboctahedra. In the fourth Pt site, Pt(4) is bonded to three equivalent Ce(1), three equivalent Pt(1), three equivalent Pt(2), and three equivalent Au(2) atoms to form PtCe3Pt6Au3 cuboctahedra that share corners with six equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, corners with six equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, corners with six equivalent Pt(3)U3Pt6Au3 cuboctahedra, edges with six equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, faces with nine equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, and faces with nine equivalent Pt(2)CeU2Pt6Au3 cuboctahedra. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 16-coordinate geometry to three equivalent U(1), one Ce(1), three equivalent Pt(2), three equivalent Pt(3), and six equivalent Pt(1) atoms. In the second Au site, Au(2) is bonded in a 16-coordinate geometry to one U(1), three equivalent Ce(1), three equivalent Pt(1), three equivalent Pt(4), and six equivalent Pt(2) atoms.
UCe(Pt4Au)2 crystallizes in the trigonal R3m space group. U(1) is bonded in a 16-coordinate geometry to three equivalent Pt(1), three equivalent Pt(3), six equivalent Pt(2), one Au(2), and three equivalent Au(1) atoms. All U(1)-Pt(1) bond lengths are 3.12 Å. All U(1)-Pt(3) bond lengths are 3.14 Å. All U(1)-Pt(2) bond lengths are 3.13 Å. The U(1)-Au(2) bond length is 3.27 Å. All U(1)-Au(1) bond lengths are 3.28 Å. Ce(1) is bonded in a 16-coordinate geometry to three equivalent Pt(2), three equivalent Pt(4), six equivalent Pt(1), one Au(1), and three equivalent Au(2) atoms. All Ce(1)-Pt(2) bond lengths are 3.16 Å. All Ce(1)-Pt(4) bond lengths are 3.14 Å. All Ce(1)-Pt(1) bond lengths are 3.15 Å. The Ce(1)-Au(1) bond length is 3.28 Å. All Ce(1)-Au(2) bond lengths are 3.28 Å. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded to one U(1), two equivalent Ce(1), one Pt(3), one Pt(4), four equivalent Pt(1), one Au(2), and two equivalent Au(1) atoms to form PtCe2UPt6Au3 cuboctahedra that share corners with two equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, corners with two equivalent Pt(3)U3Pt6Au3 cuboctahedra, corners with four equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, corners with ten equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, edges with two equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, edges with four equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, faces with three equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, faces with three equivalent Pt(3)U3Pt6Au3 cuboctahedra, faces with four equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, and faces with eight equivalent Pt(1)Ce2UPt6Au3 cuboctahedra. The Pt(1)-Pt(3) bond length is 2.66 Å. The Pt(1)-Pt(4) bond length is 2.69 Å. All Pt(1)-Pt(1) bond lengths are 2.68 Å. The Pt(1)-Au(2) bond length is 3.16 Å. Both Pt(1)-Au(1) bond lengths are 3.13 Å. In the second Pt site, Pt(2) is bonded to two equivalent U(1), one Ce(1), one Pt(3), one Pt(4), four equivalent Pt(2), one Au(1), and two equivalent Au(2) atoms to form PtCeU2Pt6Au3 cuboctahedra that share corners with two equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, corners with two equivalent Pt(3)U3Pt6Au3 cuboctahedra, corners with four equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, corners with ten equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, edges with two equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, edges with four equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, faces with three equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, faces with three equivalent Pt(3)U3Pt6Au3 cuboctahedra, faces with four equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, and faces with eight equivalent Pt(2)CeU2Pt6Au3 cuboctahedra. The Pt(2)-Pt(3) bond length is 2.67 Å. The Pt(2)-Pt(4) bond length is 2.68 Å. There are two shorter (2.66 Å) and two longer (2.70 Å) Pt(2)-Pt(2) bond lengths. The Pt(2)-Au(1) bond length is 3.11 Å. Both Pt(2)-Au(2) bond lengths are 3.14 Å. In the third Pt site, Pt(3) is bonded to three equivalent U(1), three equivalent Pt(1), three equivalent Pt(2), and three equivalent Au(1) atoms to form PtU3Pt6Au3 cuboctahedra that share corners with six equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, corners with six equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, corners with six equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, edges with six equivalent Pt(3)U3Pt6Au3 cuboctahedra, faces with nine equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, and faces with nine equivalent Pt(2)CeU2Pt6Au3 cuboctahedra. All Pt(3)-Au(1) bond lengths are 3.14 Å. In the fourth Pt site, Pt(4) is bonded to three equivalent Ce(1), three equivalent Pt(1), three equivalent Pt(2), and three equivalent Au(2) atoms to form PtCe3Pt6Au3 cuboctahedra that share corners with six equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, corners with six equivalent Pt(2)CeU2Pt6Au3 cuboctahedra, corners with six equivalent Pt(3)U3Pt6Au3 cuboctahedra, edges with six equivalent Pt(4)Ce3Pt6Au3 cuboctahedra, faces with nine equivalent Pt(1)Ce2UPt6Au3 cuboctahedra, and faces with nine equivalent Pt(2)CeU2Pt6Au3 cuboctahedra. All Pt(4)-Au(2) bond lengths are 3.14 Å. There are two inequivalent Au sites. In the first Au site, Au(1) is bonded in a 16-coordinate geometry to three equivalent U(1), one Ce(1), three equivalent Pt(2), three equivalent Pt(3), and six equivalent Pt(1) atoms. In the second Au site, Au(2) is bonded in a 16-coordinate geometry to one U(1), three equivalent Ce(1), three equivalent Pt(1), three equivalent Pt(4), and six equivalent Pt(2) atoms.