Sc5Pt9Si7 crystallizes in the hexagonal P-6 space group. There are three inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 15-coordinate geometry to three equivalent Pt(3), six equivalent Pt(1), and six equivalent Si(1) atoms. In the second Sc site, Sc(2) is bonded to six equivalent Pt(2) and six equivalent Si(2) atoms to form distorted face-sharing ScSi6Pt6 cuboctahedra. In the third Sc site, Sc(3) is bonded in a 12-coordinate geometry to one Pt(1), two equivalent Pt(2), four equivalent Pt(3), one Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 4-coordinate geometry to one Sc(3), two equivalent Sc(1), two equivalent Pt(3), two equivalent Si(1), and two equivalent Si(2) atoms. In the second Pt site, Pt(2) is bonded in a 2-coordinate geometry to two equivalent Sc(2), two equivalent Sc(3), one Pt(3), two equivalent Si(1), and two equivalent Si(2) atoms. In the third Pt site, Pt(3) is bonded in a 12-coordinate geometry to one Sc(1), four equivalent Sc(3), one Pt(2), two equivalent Pt(1), one Si(2), one Si(3), and two equivalent Si(1) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Sc(3), two equivalent Sc(1), two equivalent Pt(1), two equivalent Pt(2), and two equivalent Pt(3) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Sc(2), two equivalent Sc(3), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to six equivalent Sc(3) and three equivalent Pt(3) atoms.
Sc5Pt9Si7 crystallizes in the hexagonal P-6 space group. There are three inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 15-coordinate geometry to three equivalent Pt(3), six equivalent Pt(1), and six equivalent Si(1) atoms. All Sc(1)-Pt(3) bond lengths are 3.31 Å. All Sc(1)-Pt(1) bond lengths are 3.20 Å. All Sc(1)-Si(1) bond lengths are 2.93 Å. In the second Sc site, Sc(2) is bonded to six equivalent Pt(2) and six equivalent Si(2) atoms to form distorted face-sharing ScSi6Pt6 cuboctahedra. All Sc(2)-Pt(2) bond lengths are 3.10 Å. All Sc(2)-Si(2) bond lengths are 3.02 Å. In the third Sc site, Sc(3) is bonded in a 12-coordinate geometry to one Pt(1), two equivalent Pt(2), four equivalent Pt(3), one Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. The Sc(3)-Pt(1) bond length is 2.98 Å. Both Sc(3)-Pt(2) bond lengths are 2.90 Å. There are two shorter (2.95 Å) and two longer (3.02 Å) Sc(3)-Pt(3) bond lengths. The Sc(3)-Si(1) bond length is 2.78 Å. Both Sc(3)-Si(2) bond lengths are 2.82 Å. Both Sc(3)-Si(3) bond lengths are 2.79 Å. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 4-coordinate geometry to one Sc(3), two equivalent Sc(1), two equivalent Pt(3), two equivalent Si(1), and two equivalent Si(2) atoms. Both Pt(1)-Pt(3) bond lengths are 2.86 Å. There is one shorter (2.34 Å) and one longer (2.42 Å) Pt(1)-Si(1) bond length. Both Pt(1)-Si(2) bond lengths are 2.47 Å. In the second Pt site, Pt(2) is bonded in a 2-coordinate geometry to two equivalent Sc(2), two equivalent Sc(3), one Pt(3), two equivalent Si(1), and two equivalent Si(2) atoms. The Pt(2)-Pt(3) bond length is 2.83 Å. Both Pt(2)-Si(1) bond lengths are 2.79 Å. There is one shorter (2.35 Å) and one longer (2.37 Å) Pt(2)-Si(2) bond length. In the third Pt site, Pt(3) is bonded in a 12-coordinate geometry to one Sc(1), four equivalent Sc(3), one Pt(2), two equivalent Pt(1), one Si(2), one Si(3), and two equivalent Si(1) atoms. The Pt(3)-Si(2) bond length is 2.51 Å. The Pt(3)-Si(3) bond length is 2.46 Å. Both Pt(3)-Si(1) bond lengths are 2.47 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to one Sc(3), two equivalent Sc(1), two equivalent Pt(1), two equivalent Pt(2), and two equivalent Pt(3) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Sc(2), two equivalent Sc(3), one Pt(3), two equivalent Pt(1), and two equivalent Pt(2) atoms. In the third Si site, Si(3) is bonded in a 9-coordinate geometry to six equivalent Sc(3) and three equivalent Pt(3) atoms.