Sm2Pt3Si5 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 17-coordinate geometry to two equivalent Pt(2); five Pt(1,1); two equivalent Si(3); four equivalent Si(1); and four Si(2,2) atoms. In the second Sm site, Sm(1) is bonded in a 17-coordinate geometry to two equivalent Pt(2); five Pt(1,1); two equivalent Si(3); four equivalent Si(1); and four Si(2,2) atoms. There are three inequivalent Pt sites. In the first Pt site, Pt(2) is bonded in a 6-coordinate geometry to four Sm(1,1); two equivalent Si(1); and four Si(2,2) atoms. In the second Pt site, Pt(1) is bonded in a 5-coordinate geometry to five Sm(1,1); one Si(2); two equivalent Si(1); and two equivalent Si(3) atoms. In the third Pt site, Pt(1) is bonded in a 5-coordinate geometry to five Sm(1,1); one Si(2); two equivalent Si(1); and two equivalent Si(3) atoms. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(2); two Pt(1,1); and two Si(2,2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(1); two equivalent Pt(2); and two equivalent Si(1) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(1); two equivalent Pt(2); and two equivalent Si(1) atoms. In the fourth Si site, Si(3) is bonded in a 8-coordinate geometry to four Sm(1,1) and four Pt(1,1) atoms. In the fifth Si site, Si(1) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(2); two Pt(1,1); and two Si(2,2) atoms.
Sm2Pt3Si5 crystallizes in the orthorhombic Ibam space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 17-coordinate geometry to two equivalent Pt(2); five Pt(1,1); two equivalent Si(3); four equivalent Si(1); and four Si(2,2) atoms. Both Sm(1)-Pt(2) bond lengths are 3.41 Å. There are a spread of Sm(1)-Pt(1,1) bond distances ranging from 3.12-3.41 Å. Both Sm(1)-Si(3) bond lengths are 3.13 Å. There are two shorter (3.20 Å) and two longer (3.28 Å) Sm(1)-Si(1) bond lengths. There are a spread of Sm(1)-Si(2,2) bond distances ranging from 3.02-3.26 Å. In the second Sm site, Sm(1) is bonded in a 17-coordinate geometry to two equivalent Pt(2); five Pt(1,1); two equivalent Si(3); four equivalent Si(1); and four Si(2,2) atoms. Both Sm(1)-Pt(2) bond lengths are 3.42 Å. There are a spread of Sm(1)-Pt(1,1) bond distances ranging from 3.12-3.41 Å. Both Sm(1)-Si(3) bond lengths are 3.13 Å. There are two shorter (3.20 Å) and two longer (3.28 Å) Sm(1)-Si(1) bond lengths. There are a spread of Sm(1)-Si(2,2) bond distances ranging from 3.02-3.26 Å. There are three inequivalent Pt sites. In the first Pt site, Pt(2) is bonded in a 6-coordinate geometry to four Sm(1,1); two equivalent Si(1); and four Si(2,2) atoms. Both Pt(2)-Si(1) bond lengths are 2.63 Å. All Pt(2)-Si(2,2) bond lengths are 2.49 Å. In the second Pt site, Pt(1) is bonded in a 5-coordinate geometry to five Sm(1,1); one Si(2); two equivalent Si(1); and two equivalent Si(3) atoms. The Pt(1)-Si(2) bond length is 2.40 Å. Both Pt(1)-Si(1) bond lengths are 2.43 Å. Both Pt(1)-Si(3) bond lengths are 2.44 Å. In the third Pt site, Pt(1) is bonded in a 5-coordinate geometry to five Sm(1,1); one Si(2); two equivalent Si(1); and two equivalent Si(3) atoms. The Pt(1)-Si(2) bond length is 2.40 Å. Both Pt(1)-Si(1) bond lengths are 2.43 Å. Both Pt(1)-Si(3) bond lengths are 2.44 Å. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(2); two Pt(1,1); and two Si(2,2) atoms. Both Si(1)-Si(2,2) bond lengths are 2.51 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(1); two equivalent Pt(2); and two equivalent Si(1) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(1); two equivalent Pt(2); and two equivalent Si(1) atoms. In the fourth Si site, Si(3) is bonded in a 8-coordinate geometry to four Sm(1,1) and four Pt(1,1) atoms. In the fifth Si site, Si(1) is bonded in a 9-coordinate geometry to four Sm(1,1); one Pt(2); two Pt(1,1); and two Si(2,2) atoms. There are two shorter (3.20 Å) and two longer (3.28 Å) Si(1)-Sm(1,1) bond lengths. The Si(1)-Pt(2) bond length is 2.63 Å. Both Si(1)-Pt(1,1) bond lengths are 2.43 Å. Both Si(1)-Si(2,2) bond lengths are 2.51 Å.