Sn10Y11 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted edge, corner, and face-sharing YSn7 pentagonal bipyramids. In the second Y site, Y(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(5) atoms. In the third Y site, Y(3) is bonded in a 9-coordinate geometry to one Sn(2), four equivalent Sn(3), and four equivalent Sn(5) atoms. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one Sn(4), two equivalent Sn(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Y(1), two equivalent Y(2), and four equivalent Y(4) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Y(3), four equivalent Y(1), and four equivalent Y(2) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Y(2), two equivalent Y(3), four equivalent Y(4), two equivalent Sn(3), and two equivalent Sn(5) atoms. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Y(1) and four equivalent Y(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to one Y(2), one Y(3), two equivalent Y(4), four equivalent Y(1), one Sn(3), and one Sn(5) atom.
Sn10Y11 crystallizes in the tetragonal I4/mmm space group. There are four inequivalent Y sites. In the first Y site, Y(1) is bonded to one Sn(1), one Sn(2), one Sn(4), and four equivalent Sn(5) atoms to form a mixture of distorted edge, corner, and face-sharing YSn7 pentagonal bipyramids. The Y(1)-Sn(1) bond length is 3.46 Å. The Y(1)-Sn(2) bond length is 3.19 Å. The Y(1)-Sn(4) bond length is 3.07 Å. There are two shorter (3.36 Å) and two longer (3.46 Å) Y(1)-Sn(5) bond lengths. In the second Y site, Y(2) is bonded in a 7-coordinate geometry to one Sn(3), two equivalent Sn(1), two equivalent Sn(2), and two equivalent Sn(5) atoms. The Y(2)-Sn(3) bond length is 3.24 Å. Both Y(2)-Sn(1) bond lengths are 2.92 Å. Both Y(2)-Sn(2) bond lengths are 3.49 Å. Both Y(2)-Sn(5) bond lengths are 3.61 Å. In the third Y site, Y(3) is bonded in a 9-coordinate geometry to one Sn(2), four equivalent Sn(3), and four equivalent Sn(5) atoms. The Y(3)-Sn(2) bond length is 3.81 Å. All Y(3)-Sn(3) bond lengths are 3.50 Å. All Y(3)-Sn(5) bond lengths are 3.40 Å. In the fourth Y site, Y(4) is bonded in a 7-coordinate geometry to one Sn(4), two equivalent Sn(1), two equivalent Sn(3), and two equivalent Sn(5) atoms. The Y(4)-Sn(4) bond length is 3.23 Å. Both Y(4)-Sn(1) bond lengths are 3.13 Å. Both Y(4)-Sn(3) bond lengths are 3.28 Å. Both Y(4)-Sn(5) bond lengths are 3.08 Å. There are five inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 8-coordinate geometry to two equivalent Y(1), two equivalent Y(2), and four equivalent Y(4) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to one Y(3), four equivalent Y(1), and four equivalent Y(2) atoms. In the third Sn site, Sn(3) is bonded in a 11-coordinate geometry to one Y(2), two equivalent Y(3), four equivalent Y(4), two equivalent Sn(3), and two equivalent Sn(5) atoms. Both Sn(3)-Sn(3) bond lengths are 2.97 Å. Both Sn(3)-Sn(5) bond lengths are 3.30 Å. In the fourth Sn site, Sn(4) is bonded in a 8-coordinate geometry to four equivalent Y(1) and four equivalent Y(4) atoms. In the fifth Sn site, Sn(5) is bonded in a 10-coordinate geometry to one Y(2), one Y(3), two equivalent Y(4), four equivalent Y(1), one Sn(3), and one Sn(5) atom. The Sn(5)-Sn(5) bond length is 2.89 Å.