Sc5(Rh2Si5)2 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 16-coordinate geometry to four equivalent Rh(1), four equivalent Si(2), and eight equivalent Si(3) atoms. In the second Sc site, Sc(2) is bonded to four equivalent Rh(1), two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms to form face-sharing ScSi8Rh4 cuboctahedra. In the third Sc site, Sc(3) is bonded in a 14-coordinate geometry to four equivalent Rh(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. Rh(1) is bonded in a 5-coordinate geometry to one Sc(1), two equivalent Sc(2), two equivalent Sc(3), one Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sc(2), four equivalent Sc(3), two equivalent Rh(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 2-coordinate geometry to one Sc(1), two equivalent Sc(2), two equivalent Sc(3), and two equivalent Rh(1) atoms. In the third Si site, Si(3) is bonded in a 2-coordinate geometry to one Sc(2), one Sc(3), two equivalent Sc(1), and two equivalent Rh(1) atoms.
Sc5(Rh2Si5)2 crystallizes in the tetragonal P4/mbm space group. There are three inequivalent Sc sites. In the first Sc site, Sc(1) is bonded in a 16-coordinate geometry to four equivalent Rh(1), four equivalent Si(2), and eight equivalent Si(3) atoms. All Sc(1)-Rh(1) bond lengths are 3.07 Å. All Sc(1)-Si(2) bond lengths are 3.22 Å. All Sc(1)-Si(3) bond lengths are 2.78 Å. In the second Sc site, Sc(2) is bonded to four equivalent Rh(1), two equivalent Si(1), two equivalent Si(3), and four equivalent Si(2) atoms to form face-sharing ScSi8Rh4 cuboctahedra. All Sc(2)-Rh(1) bond lengths are 2.96 Å. Both Sc(2)-Si(1) bond lengths are 2.80 Å. Both Sc(2)-Si(3) bond lengths are 3.02 Å. All Sc(2)-Si(2) bond lengths are 2.87 Å. In the third Sc site, Sc(3) is bonded in a 14-coordinate geometry to four equivalent Rh(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. All Sc(3)-Rh(1) bond lengths are 3.16 Å. Both Sc(3)-Si(3) bond lengths are 3.24 Å. All Sc(3)-Si(1) bond lengths are 3.07 Å. All Sc(3)-Si(2) bond lengths are 3.13 Å. Rh(1) is bonded in a 5-coordinate geometry to one Sc(1), two equivalent Sc(2), two equivalent Sc(3), one Si(1), two equivalent Si(2), and two equivalent Si(3) atoms. The Rh(1)-Si(1) bond length is 2.40 Å. There is one shorter (2.36 Å) and one longer (2.46 Å) Rh(1)-Si(2) bond length. Both Rh(1)-Si(3) bond lengths are 2.35 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to two equivalent Sc(2), four equivalent Sc(3), two equivalent Rh(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.31 Å. In the second Si site, Si(2) is bonded in a 2-coordinate geometry to one Sc(1), two equivalent Sc(2), two equivalent Sc(3), and two equivalent Rh(1) atoms. In the third Si site, Si(3) is bonded in a 2-coordinate geometry to one Sc(2), one Sc(3), two equivalent Sc(1), and two equivalent Rh(1) atoms.