Sm11Sn10 crystallizes in the monoclinic C2/m space group. There are seven inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. In the second Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. In the third Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(6) atoms. In the fourth Sm site, Sm(3) is bonded in a 7-coordinate geometry to one Sn(4); two equivalent Sn(1); two equivalent Sn(2); and two Sn(7,7) atoms. In the fifth Sm site, Sm(4) is bonded in a 9-coordinate geometry to one Sn(2); two equivalent Sn(3); two equivalent Sn(4); two equivalent Sn(6); and two Sn(7,7) atoms. In the sixth Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. In the seventh Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to one Sm(2); one Sm(3); two Sm(1,1); and four Sm(5,5) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Sm(4); two equivalent Sm(2); two equivalent Sm(3); and four Sm(1,1) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Sm(2); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(4); and two equivalent Sn(6) atoms. In the fourth Sn site, Sn(4) is bonded in a 11-coordinate geometry to one Sm(3); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(3); and two Sn(7,7) atoms. In the fifth Sn site, Sn(5) is bonded in a 8-coordinate geometry to four Sm(1,1) and four Sm(5,5) atoms. In the sixth Sn site, Sn(6) is bonded in a 9-coordinate geometry to one Sm(2); one Sm(4); two Sm(5,5); four Sm(1,1); one Sn(3); and one Sn(6) atom. In the seventh Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. In the eighth Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom.
Sm11Sn10 crystallizes in the monoclinic C2/m space group. There are seven inequivalent Sm sites. In the first Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. The Sm(1)-Sn(1) bond length is 3.55 Å. The Sm(1)-Sn(2) bond length is 3.27 Å. The Sm(1)-Sn(5) bond length is 3.12 Å. There is one shorter (3.42 Å) and one longer (3.51 Å) Sm(1)-Sn(6) bond length. There is one shorter (3.41 Å) and one longer (3.51 Å) Sm(1)-Sn(7) bond length. In the second Sm site, Sm(1) is bonded to one Sn(1), one Sn(2), one Sn(5), two equivalent Sn(6), and two equivalent Sn(7) atoms to form a mixture of distorted edge, corner, and face-sharing SmSn7 pentagonal bipyramids. The Sm(1)-Sn(1) bond length is 3.55 Å. The Sm(1)-Sn(2) bond length is 3.27 Å. The Sm(1)-Sn(5) bond length is 3.12 Å. There is one shorter (3.42 Å) and one longer (3.51 Å) Sm(1)-Sn(6) bond length. There is one shorter (3.41 Å) and one longer (3.50 Å) Sm(1)-Sn(7) bond length. In the third Sm site, Sm(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(6) atoms. The Sm(2)-Sn(3) bond length is 3.34 Å. Both Sm(2)-Sn(1) bond lengths are 2.98 Å. Both Sm(2)-Sn(2) bond lengths are 3.53 Å. Both Sm(2)-Sn(6) bond lengths are 3.69 Å. In the fourth Sm site, Sm(3) is bonded in a 7-coordinate geometry to one Sn(4); two equivalent Sn(1); two equivalent Sn(2); and two Sn(7,7) atoms. The Sm(3)-Sn(4) bond length is 3.33 Å. Both Sm(3)-Sn(1) bond lengths are 2.98 Å. Both Sm(3)-Sn(2) bond lengths are 3.53 Å. Both Sm(3)-Sn(7,7) bond lengths are 3.69 Å. In the fifth Sm site, Sm(4) is bonded in a 9-coordinate geometry to one Sn(2); two equivalent Sn(3); two equivalent Sn(4); two equivalent Sn(6); and two Sn(7,7) atoms. The Sm(4)-Sn(2) bond length is 3.93 Å. Both Sm(4)-Sn(3) bond lengths are 3.55 Å. Both Sm(4)-Sn(4) bond lengths are 3.55 Å. Both Sm(4)-Sn(6) bond lengths are 3.47 Å. Both Sm(4)-Sn(7,7) bond lengths are 3.47 Å. In the sixth Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. The Sm(5)-Sn(3) bond length is 3.33 Å. The Sm(5)-Sn(4) bond length is 3.33 Å. The Sm(5)-Sn(5) bond length is 3.30 Å. The Sm(5)-Sn(6) bond length is 3.14 Å. The Sm(5)-Sn(7) bond length is 3.14 Å. Both Sm(5)-Sn(1) bond lengths are 3.19 Å. In the seventh Sm site, Sm(5) is bonded in a 7-coordinate geometry to one Sn(3), one Sn(4), one Sn(5), one Sn(6), one Sn(7), and two equivalent Sn(1) atoms. The Sm(5)-Sn(3) bond length is 3.33 Å. The Sm(5)-Sn(4) bond length is 3.33 Å. The Sm(5)-Sn(5) bond length is 3.30 Å. The Sm(5)-Sn(6) bond length is 3.14 Å. The Sm(5)-Sn(7) bond length is 3.14 Å. Both Sm(5)-Sn(1) bond lengths are 3.19 Å. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to one Sm(2); one Sm(3); two Sm(1,1); and four Sm(5,5) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Sm(4); two equivalent Sm(2); two equivalent Sm(3); and four Sm(1,1) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Sm(2); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(4); and two equivalent Sn(6) atoms. Both Sn(3)-Sn(4) bond lengths are 2.98 Å. Both Sn(3)-Sn(6) bond lengths are 3.40 Å. In the fourth Sn site, Sn(4) is bonded in a 11-coordinate geometry to one Sm(3); two equivalent Sm(4); four Sm(5,5); two equivalent Sn(3); and two Sn(7,7) atoms. There is one shorter (3.39 Å) and one longer (3.40 Å) Sn(4)-Sn(7,7) bond length. In the fifth Sn site, Sn(5) is bonded in a 8-coordinate geometry to four Sm(1,1) and four Sm(5,5) atoms. In the sixth Sn site, Sn(6) is bonded in a 9-coordinate geometry to one Sm(2); one Sm(4); two Sm(5,5); four Sm(1,1); one Sn(3); and one Sn(6) atom. The Sn(6)-Sn(6) bond length is 2.91 Å. In the seventh Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. The Sn(7)-Sn(7) bond length is 2.91 Å. In the eighth Sn site, Sn(7) is bonded in a 9-coordinate geometry to one Sm(3), one Sm(4), two equivalent Sm(5), four equivalent Sm(1), one Sn(4), and one Sn(7) atom. The Sn(7)-Sn(7) bond length is 2.91 Å.