Ce3(Pt2Al3)2 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 15-coordinate geometry to one Pt(3), two equivalent Pt(2), two equivalent Pt(4), one Al(5), two equivalent Al(3), two equivalent Al(4), two equivalent Al(6), and three equivalent Al(2) atoms. In the second Ce site, Ce(2) is bonded in a 16-coordinate geometry to two equivalent Pt(1), two equivalent Pt(3), two equivalent Pt(4), one Al(2), one Al(4), one Al(6), two equivalent Al(3), two equivalent Al(5), and three equivalent Al(1) atoms. In the third Ce site, Ce(3) is bonded in a 12-coordinate geometry to two equivalent Pt(1), two equivalent Pt(2), one Al(1), one Al(5), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(6) atoms. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(3), one Al(3), one Al(6), and three equivalent Al(1) atoms. In the second Pt site, Pt(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), one Al(2), one Al(4), one Al(6), and two equivalent Al(5) atoms. In the third Pt site, Pt(3) is bonded in a 7-coordinate geometry to one Ce(1), two equivalent Ce(2), one Al(1), one Al(5), two equivalent Al(4), and two equivalent Al(6) atoms. In the fourth Pt site, Pt(4) is bonded in a 5-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Al(3), one Al(5), and three equivalent Al(2) atoms. There are six inequivalent Al sites. In the first Al site, Al(6) is bonded to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), one Pt(1), one Pt(2), and two equivalent Pt(3) atoms to form distorted AlCe5Pt4 tetrahedra that share corners with five equivalent Al(2)Ce4Pt4 tetrahedra,  an edgeedge with one Al(1)Ce4Pt4 tetrahedra, edges with two equivalent Al(5)Ce4Pt4 tetrahedra,  a faceface with one Al(2)Ce4Pt4 tetrahedra, faces with two equivalent Al(1)Ce4Pt4 tetrahedra, faces with two equivalent Al(5)Ce4Pt4 tetrahedra, and faces with two equivalent Al(6)Ce5Pt4 tetrahedra. In the second Al site, Al(1) is bonded to one Ce(3), three equivalent Ce(2), one Pt(3), and three equivalent Pt(1) atoms to form distorted AlCe4Pt4 tetrahedra that share corners with three equivalent Al(2)Ce4Pt4 tetrahedra, corners with five equivalent Al(5)Ce4Pt4 tetrahedra,  an edgeedge with one Al(6)Ce5Pt4 tetrahedra, edges with two equivalent Al(1)Ce4Pt4 tetrahedra,  a faceface with one Al(5)Ce4Pt4 tetrahedra, faces with two equivalent Al(1)Ce4Pt4 tetrahedra, and faces with two equivalent Al(6)Ce5Pt4 tetrahedra. In the third Al site, Al(2) is bonded to one Ce(2), three equivalent Ce(1), one Pt(2), and three equivalent Pt(4) atoms to form distorted AlCe4Pt4 tetrahedra that share corners with three equivalent Al(1)Ce4Pt4 tetrahedra, corners with five equivalent Al(6)Ce5Pt4 tetrahedra,  an edgeedge with one Al(5)Ce4Pt4 tetrahedra, edges with two equivalent Al(2)Ce4Pt4 tetrahedra,  a faceface with one Al(6)Ce5Pt4 tetrahedra, faces with two equivalent Al(2)Ce4Pt4 tetrahedra, and faces with two equivalent Al(5)Ce4Pt4 tetrahedra. In the fourth Al site, Al(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(3), one Pt(1), and one Pt(4) atom. In the fifth Al site, Al(4) is bonded in a distorted trigonal non-coplanar geometry to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), one Pt(2), and two equivalent Pt(3) atoms. In the sixth Al site, Al(5) is bonded to one Ce(1), one Ce(3), two equivalent Ce(2), one Pt(3), one Pt(4), and two equivalent Pt(2) atoms to form distorted AlCe4Pt4 tetrahedra that share corners with five equivalent Al(1)Ce4Pt4 tetrahedra,  an edgeedge with one Al(2)Ce4Pt4 tetrahedra, edges with two equivalent Al(5)Ce4Pt4 tetrahedra, edges with two equivalent Al(6)Ce5Pt4 tetrahedra,  a faceface with one Al(1)Ce4Pt4 tetrahedra, faces with two equivalent Al(2)Ce4Pt4 tetrahedra, and faces with two equivalent Al(6)Ce5Pt4 tetrahedra.
Ce3(Pt2Al3)2 crystallizes in the orthorhombic Pnma space group. There are three inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 15-coordinate geometry to one Pt(3), two equivalent Pt(2), two equivalent Pt(4), one Al(5), two equivalent Al(3), two equivalent Al(4), two equivalent Al(6), and three equivalent Al(2) atoms. The Ce(1)-Pt(3) bond length is 3.15 Å. Both Ce(1)-Pt(2) bond lengths are 3.17 Å. Both Ce(1)-Pt(4) bond lengths are 3.39 Å. The Ce(1)-Al(5) bond length is 3.45 Å. Both Ce(1)-Al(3) bond lengths are 3.34 Å. Both Ce(1)-Al(4) bond lengths are 3.69 Å. Both Ce(1)-Al(6) bond lengths are 3.50 Å. There are two shorter (3.37 Å) and one longer (3.45 Å) Ce(1)-Al(2) bond length. In the second Ce site, Ce(2) is bonded in a 16-coordinate geometry to two equivalent Pt(1), two equivalent Pt(3), two equivalent Pt(4), one Al(2), one Al(4), one Al(6), two equivalent Al(3), two equivalent Al(5), and three equivalent Al(1) atoms. Both Ce(2)-Pt(1) bond lengths are 3.29 Å. Both Ce(2)-Pt(3) bond lengths are 3.43 Å. Both Ce(2)-Pt(4) bond lengths are 3.36 Å. The Ce(2)-Al(2) bond length is 3.45 Å. The Ce(2)-Al(4) bond length is 3.50 Å. The Ce(2)-Al(6) bond length is 3.57 Å. Both Ce(2)-Al(3) bond lengths are 3.30 Å. Both Ce(2)-Al(5) bond lengths are 3.32 Å. There are two shorter (3.27 Å) and one longer (3.56 Å) Ce(2)-Al(1) bond length. In the third Ce site, Ce(3) is bonded in a 12-coordinate geometry to two equivalent Pt(1), two equivalent Pt(2), one Al(1), one Al(5), two equivalent Al(3), two equivalent Al(4), and two equivalent Al(6) atoms. Both Ce(3)-Pt(1) bond lengths are 3.12 Å. Both Ce(3)-Pt(2) bond lengths are 3.03 Å. The Ce(3)-Al(1) bond length is 3.13 Å. The Ce(3)-Al(5) bond length is 3.11 Å. Both Ce(3)-Al(3) bond lengths are 3.12 Å. Both Ce(3)-Al(4) bond lengths are 3.19 Å. Both Ce(3)-Al(6) bond lengths are 3.22 Å. There are four inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 9-coordinate geometry to two equivalent Ce(2), two equivalent Ce(3), one Al(3), one Al(6), and three equivalent Al(1) atoms. The Pt(1)-Al(3) bond length is 2.54 Å. The Pt(1)-Al(6) bond length is 2.63 Å. There is one shorter (2.53 Å) and two longer (2.57 Å) Pt(1)-Al(1) bond lengths. In the second Pt site, Pt(2) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(3), one Al(2), one Al(4), one Al(6), and two equivalent Al(5) atoms. The Pt(2)-Al(2) bond length is 2.57 Å. The Pt(2)-Al(4) bond length is 2.65 Å. The Pt(2)-Al(6) bond length is 2.73 Å. Both Pt(2)-Al(5) bond lengths are 2.66 Å. In the third Pt site, Pt(3) is bonded in a 7-coordinate geometry to one Ce(1), two equivalent Ce(2), one Al(1), one Al(5), two equivalent Al(4), and two equivalent Al(6) atoms. The Pt(3)-Al(1) bond length is 2.57 Å. The Pt(3)-Al(5) bond length is 2.62 Å. Both Pt(3)-Al(4) bond lengths are 2.59 Å. Both Pt(3)-Al(6) bond lengths are 2.64 Å. In the fourth Pt site, Pt(4) is bonded in a 5-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Al(3), one Al(5), and three equivalent Al(2) atoms. The Pt(4)-Al(3) bond length is 2.44 Å. The Pt(4)-Al(5) bond length is 2.52 Å. There are two shorter (2.52 Å) and one longer (2.58 Å) Pt(4)-Al(2) bond length. There are six inequivalent Al sites. In the first Al site, Al(6) is bonded to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), one Pt(1), one Pt(2), and two equivalent Pt(3) atoms to form distorted AlCe5Pt4 tetrahedra that share corners with five equivalent Al(2)Ce4Pt4 tetrahedra,  an edgeedge with one Al(1)Ce4Pt4 tetrahedra, edges with two equivalent Al(5)Ce4Pt4 tetrahedra,  a faceface with one Al(2)Ce4Pt4 tetrahedra, faces with two equivalent Al(1)Ce4Pt4 tetrahedra, faces with two equivalent Al(5)Ce4Pt4 tetrahedra, and faces with two equivalent Al(6)Ce5Pt4 tetrahedra. In the second Al site, Al(1) is bonded to one Ce(3), three equivalent Ce(2), one Pt(3), and three equivalent Pt(1) atoms to form distorted AlCe4Pt4 tetrahedra that share corners with three equivalent Al(2)Ce4Pt4 tetrahedra, corners with five equivalent Al(5)Ce4Pt4 tetrahedra,  an edgeedge with one Al(6)Ce5Pt4 tetrahedra, edges with two equivalent Al(1)Ce4Pt4 tetrahedra,  a faceface with one Al(5)Ce4Pt4 tetrahedra, faces with two equivalent Al(1)Ce4Pt4 tetrahedra, and faces with two equivalent Al(6)Ce5Pt4 tetrahedra. In the third Al site, Al(2) is bonded to one Ce(2), three equivalent Ce(1), one Pt(2), and three equivalent Pt(4) atoms to form distorted AlCe4Pt4 tetrahedra that share corners with three equivalent Al(1)Ce4Pt4 tetrahedra, corners with five equivalent Al(6)Ce5Pt4 tetrahedra,  an edgeedge with one Al(5)Ce4Pt4 tetrahedra, edges with two equivalent Al(2)Ce4Pt4 tetrahedra,  a faceface with one Al(6)Ce5Pt4 tetrahedra, faces with two equivalent Al(2)Ce4Pt4 tetrahedra, and faces with two equivalent Al(5)Ce4Pt4 tetrahedra. In the fourth Al site, Al(3) is bonded in a distorted bent 120 degrees geometry to two equivalent Ce(1), two equivalent Ce(2), two equivalent Ce(3), one Pt(1), and one Pt(4) atom. In the fifth Al site, Al(4) is bonded in a distorted trigonal non-coplanar geometry to one Ce(2), two equivalent Ce(1), two equivalent Ce(3), one Pt(2), and two equivalent Pt(3) atoms. In the sixth Al site, Al(5) is bonded to one Ce(1), one Ce(3), two equivalent Ce(2), one Pt(3), one Pt(4), and two equivalent Pt(2) atoms to form distorted AlCe4Pt4 tetrahedra that share corners with five equivalent Al(1)Ce4Pt4 tetrahedra,  an edgeedge with one Al(2)Ce4Pt4 tetrahedra, edges with two equivalent Al(5)Ce4Pt4 tetrahedra, edges with two equivalent Al(6)Ce5Pt4 tetrahedra,  a faceface with one Al(1)Ce4Pt4 tetrahedra, faces with two equivalent Al(2)Ce4Pt4 tetrahedra, and faces with two equivalent Al(6)Ce5Pt4 tetrahedra.