Sm2Rh3Si5 crystallizes in the orthorhombic Ibam space group. Sm(1) is bonded in a 17-coordinate geometry to two equivalent Rh(2), five equivalent Rh(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. There are two inequivalent Rh sites. In the first Rh site, Rh(2) is bonded in a 6-coordinate geometry to four equivalent Sm(1), two equivalent Si(1), and four equivalent Si(2) atoms. In the second Rh site, Rh(1) is bonded in a 5-coordinate geometry to five equivalent Sm(1), one Si(2), two equivalent Si(1), and two equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 3-coordinate geometry to four equivalent Sm(1), one Rh(2), two equivalent Rh(1), and two equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one Rh(1), two equivalent Rh(2), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 4-coordinate geometry to four equivalent Sm(1) and four equivalent Rh(1) atoms.
Sm2Rh3Si5 crystallizes in the orthorhombic Ibam space group. Sm(1) is bonded in a 17-coordinate geometry to two equivalent Rh(2), five equivalent Rh(1), two equivalent Si(3), four equivalent Si(1), and four equivalent Si(2) atoms. Both Sm(1)-Rh(2) bond lengths are 3.39 Å. There are a spread of Sm(1)-Rh(1) bond distances ranging from 3.11-3.39 Å. Both Sm(1)-Si(3) bond lengths are 3.11 Å. All Sm(1)-Si(1) bond lengths are 3.20 Å. There are a spread of Sm(1)-Si(2) bond distances ranging from 2.99-3.16 Å. There are two inequivalent Rh sites. In the first Rh site, Rh(2) is bonded in a 6-coordinate geometry to four equivalent Sm(1), two equivalent Si(1), and four equivalent Si(2) atoms. Both Rh(2)-Si(1) bond lengths are 2.60 Å. All Rh(2)-Si(2) bond lengths are 2.44 Å. In the second Rh site, Rh(1) is bonded in a 5-coordinate geometry to five equivalent Sm(1), one Si(2), two equivalent Si(1), and two equivalent Si(3) atoms. The Rh(1)-Si(2) bond length is 2.37 Å. Both Rh(1)-Si(1) bond lengths are 2.42 Å. Both Rh(1)-Si(3) bond lengths are 2.43 Å. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 3-coordinate geometry to four equivalent Sm(1), one Rh(2), two equivalent Rh(1), and two equivalent Si(2) atoms. Both Si(1)-Si(2) bond lengths are 2.51 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Sm(1), one Rh(1), two equivalent Rh(2), and two equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 4-coordinate geometry to four equivalent Sm(1) and four equivalent Rh(1) atoms.