Ce2Pt7Si4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 16-coordinate geometry to one Pt(5), one Pt(7), two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(3), three equivalent Pt(4), two equivalent Si(4), and three equivalent Si(1) atoms. In the second Ce site, Ce(2) is bonded in a 17-coordinate geometry to one Pt(2), one Pt(3), one Pt(5), two equivalent Pt(1), three equivalent Pt(6), three equivalent Pt(7), two equivalent Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. There are seven inequivalent Pt sites. In the first Pt site, Pt(6) is bonded in a 2-coordinate geometry to three equivalent Ce(2), one Si(3), and three equivalent Si(2) atoms. In the second Pt site, Pt(7) is bonded to one Ce(1), three equivalent Ce(2), one Si(3), and three equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing PtCe4Si4 tetrahedra. In the third Pt site, Pt(1) is bonded in a 2-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Si(2), and one Si(4) atom. In the fourth Pt site, Pt(2) is bonded in a 6-coordinate geometry to one Ce(2), two equivalent Ce(1), one Si(1), one Si(4), and two equivalent Si(3) atoms. In the fifth Pt site, Pt(3) is bonded in a 3-coordinate geometry to one Ce(2), two equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. In the sixth Pt site, Pt(4) is bonded in a 5-coordinate geometry to three equivalent Ce(1), one Si(3), and two equivalent Si(1) atoms. In the seventh Pt site, Pt(5) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), one Si(2), and two equivalent Si(3) atoms. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to three equivalent Ce(1), one Pt(2), one Pt(3), and two equivalent Pt(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Pt(1), one Pt(5), two equivalent Pt(3), and three equivalent Pt(6) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Pt(4), one Pt(6), one Pt(7), two equivalent Pt(2), and two equivalent Pt(5) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Pt(1), one Pt(2), and three equivalent Pt(7) atoms.
Ce2Pt7Si4 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 16-coordinate geometry to one Pt(5), one Pt(7), two equivalent Pt(1), two equivalent Pt(2), two equivalent Pt(3), three equivalent Pt(4), two equivalent Si(4), and three equivalent Si(1) atoms. The Ce(1)-Pt(5) bond length is 3.26 Å. The Ce(1)-Pt(7) bond length is 3.59 Å. Both Ce(1)-Pt(1) bond lengths are 3.48 Å. Both Ce(1)-Pt(2) bond lengths are 3.09 Å. Both Ce(1)-Pt(3) bond lengths are 3.30 Å. There are two shorter (3.11 Å) and one longer (3.71 Å) Ce(1)-Pt(4) bond length. Both Ce(1)-Si(4) bond lengths are 3.34 Å. There is one shorter (3.20 Å) and two longer (3.31 Å) Ce(1)-Si(1) bond lengths. In the second Ce site, Ce(2) is bonded in a 17-coordinate geometry to one Pt(2), one Pt(3), one Pt(5), two equivalent Pt(1), three equivalent Pt(6), three equivalent Pt(7), two equivalent Si(2), two equivalent Si(3), and two equivalent Si(4) atoms. The Ce(2)-Pt(2) bond length is 3.52 Å. The Ce(2)-Pt(3) bond length is 3.42 Å. The Ce(2)-Pt(5) bond length is 3.47 Å. Both Ce(2)-Pt(1) bond lengths are 3.12 Å. There are two shorter (3.20 Å) and one longer (3.65 Å) Ce(2)-Pt(6) bond length. There are two shorter (3.28 Å) and one longer (3.34 Å) Ce(2)-Pt(7) bond length. Both Ce(2)-Si(2) bond lengths are 3.10 Å. Both Ce(2)-Si(3) bond lengths are 3.18 Å. Both Ce(2)-Si(4) bond lengths are 3.09 Å. There are seven inequivalent Pt sites. In the first Pt site, Pt(6) is bonded in a 2-coordinate geometry to three equivalent Ce(2), one Si(3), and three equivalent Si(2) atoms. The Pt(6)-Si(3) bond length is 2.43 Å. There is one shorter (2.37 Å) and two longer (2.79 Å) Pt(6)-Si(2) bond lengths. In the second Pt site, Pt(7) is bonded to one Ce(1), three equivalent Ce(2), one Si(3), and three equivalent Si(4) atoms to form a mixture of distorted face and edge-sharing PtCe4Si4 tetrahedra. The Pt(7)-Si(3) bond length is 2.47 Å. There is one shorter (2.51 Å) and two longer (2.54 Å) Pt(7)-Si(4) bond lengths. In the third Pt site, Pt(1) is bonded in a 2-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Si(2), and one Si(4) atom. The Pt(1)-Si(2) bond length is 2.42 Å. The Pt(1)-Si(4) bond length is 2.39 Å. In the fourth Pt site, Pt(2) is bonded in a 6-coordinate geometry to one Ce(2), two equivalent Ce(1), one Si(1), one Si(4), and two equivalent Si(3) atoms. The Pt(2)-Si(1) bond length is 2.48 Å. The Pt(2)-Si(4) bond length is 2.38 Å. Both Pt(2)-Si(3) bond lengths are 2.57 Å. In the fifth Pt site, Pt(3) is bonded in a 3-coordinate geometry to one Ce(2), two equivalent Ce(1), one Si(1), and two equivalent Si(2) atoms. The Pt(3)-Si(1) bond length is 2.35 Å. Both Pt(3)-Si(2) bond lengths are 2.49 Å. In the sixth Pt site, Pt(4) is bonded in a 5-coordinate geometry to three equivalent Ce(1), one Si(3), and two equivalent Si(1) atoms. The Pt(4)-Si(3) bond length is 2.48 Å. Both Pt(4)-Si(1) bond lengths are 2.48 Å. In the seventh Pt site, Pt(5) is bonded in a 3-coordinate geometry to one Ce(1), one Ce(2), one Si(2), and two equivalent Si(3) atoms. The Pt(5)-Si(2) bond length is 2.37 Å. Both Pt(5)-Si(3) bond lengths are 2.60 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded in a 4-coordinate geometry to three equivalent Ce(1), one Pt(2), one Pt(3), and two equivalent Pt(4) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Pt(1), one Pt(5), two equivalent Pt(3), and three equivalent Pt(6) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to two equivalent Ce(2), one Pt(4), one Pt(6), one Pt(7), two equivalent Pt(2), and two equivalent Pt(5) atoms. In the fourth Si site, Si(4) is bonded in a 9-coordinate geometry to two equivalent Ce(1), two equivalent Ce(2), one Pt(1), one Pt(2), and three equivalent Pt(7) atoms.