Yb11Sb10 crystallizes in the monoclinic C2/m space group. There are seven inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 7-coordinate geometry to one Sb(2), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and two equivalent Sb(8) atoms. In the second Yb site, Yb(2) is bonded in a 7-coordinate geometry to one Sb(1), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and two equivalent Sb(8) atoms. In the third Yb site, Yb(3) is bonded in a 9-coordinate geometry to one Sb(1), one Sb(2), one Sb(7), two equivalent Sb(3), two equivalent Sb(5), and two equivalent Sb(6) atoms. In the fourth Yb site, Yb(4) is bonded in a 7-coordinate geometry to one Sb(1), one Sb(2), one Sb(5), two equivalent Sb(7), and two equivalent Sb(8) atoms. In the fifth Yb site, Yb(5) is bonded in a 7-coordinate geometry to one Sb(6), two equivalent Sb(3), two equivalent Sb(7), and two equivalent Sb(8) atoms. In the sixth Yb site, Yb(6) is bonded to one Sb(4), one Sb(7), one Sb(8), two equivalent Sb(1), and two equivalent Sb(3) atoms to form a mixture of distorted edge, face, and corner-sharing YbSb7 pentagonal bipyramids. In the seventh Yb site, Yb(7) is bonded to one Sb(4), one Sb(7), one Sb(8), two equivalent Sb(2), and two equivalent Sb(3) atoms to form a mixture of distorted edge, face, and corner-sharing YbSb7 pentagonal bipyramids. There are eight inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 10-coordinate geometry to one Yb(3), one Yb(4), two equivalent Yb(2), four equivalent Yb(6), one Sb(1), and one Sb(5) atom. In the second Sb site, Sb(2) is bonded in a 10-coordinate geometry to one Yb(3), one Yb(4), two equivalent Yb(1), four equivalent Yb(7), one Sb(2), and one Sb(5) atom. In the third Sb site, Sb(3) is bonded in a 10-coordinate geometry to one Yb(1), one Yb(2), one Yb(3), one Yb(5), two equivalent Yb(6), two equivalent Yb(7), one Sb(3), and one Sb(6) atom. In the fourth Sb site, Sb(4) is bonded in a 8-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), two equivalent Yb(6), and two equivalent Yb(7) atoms. In the fifth Sb site, Sb(5) is bonded in a 11-coordinate geometry to one Yb(4), two equivalent Yb(1), two equivalent Yb(2), two equivalent Yb(3), one Sb(1), one Sb(2), and two equivalent Sb(6) atoms. In the sixth Sb site, Sb(6) is bonded in a 11-coordinate geometry to one Yb(5), two equivalent Yb(1), two equivalent Yb(2), two equivalent Yb(3), two equivalent Sb(3), and two equivalent Sb(5) atoms. In the seventh Sb site, Sb(7) is bonded in a 9-coordinate geometry to one Yb(3), two equivalent Yb(4), two equivalent Yb(5), two equivalent Yb(6), and two equivalent Yb(7) atoms. In the eighth Sb site, Sb(8) is bonded in a 8-coordinate geometry to one Yb(4), one Yb(5), one Yb(6), one Yb(7), two equivalent Yb(1), and two equivalent Yb(2) atoms.
Yb11Sb10 crystallizes in the monoclinic C2/m space group. There are seven inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 7-coordinate geometry to one Sb(2), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and two equivalent Sb(8) atoms. The Yb(1)-Sb(2) bond length is 3.17 Å. The Yb(1)-Sb(3) bond length is 3.17 Å. The Yb(1)-Sb(4) bond length is 3.17 Å. The Yb(1)-Sb(5) bond length is 3.42 Å. The Yb(1)-Sb(6) bond length is 3.42 Å. There is one shorter (3.16 Å) and one longer (3.17 Å) Yb(1)-Sb(8) bond length. In the second Yb site, Yb(2) is bonded in a 7-coordinate geometry to one Sb(1), one Sb(3), one Sb(4), one Sb(5), one Sb(6), and two equivalent Sb(8) atoms. The Yb(2)-Sb(1) bond length is 3.17 Å. The Yb(2)-Sb(3) bond length is 3.17 Å. The Yb(2)-Sb(4) bond length is 3.16 Å. The Yb(2)-Sb(5) bond length is 3.42 Å. The Yb(2)-Sb(6) bond length is 3.42 Å. There is one shorter (3.16 Å) and one longer (3.17 Å) Yb(2)-Sb(8) bond length. In the third Yb site, Yb(3) is bonded in a 9-coordinate geometry to one Sb(1), one Sb(2), one Sb(7), two equivalent Sb(3), two equivalent Sb(5), and two equivalent Sb(6) atoms. The Yb(3)-Sb(1) bond length is 3.46 Å. The Yb(3)-Sb(2) bond length is 3.47 Å. The Yb(3)-Sb(7) bond length is 3.56 Å. Both Yb(3)-Sb(3) bond lengths are 3.48 Å. There is one shorter (3.53 Å) and one longer (3.54 Å) Yb(3)-Sb(5) bond length. Both Yb(3)-Sb(6) bond lengths are 3.52 Å. In the fourth Yb site, Yb(4) is bonded in a 7-coordinate geometry to one Sb(1), one Sb(2), one Sb(5), two equivalent Sb(7), and two equivalent Sb(8) atoms. The Yb(4)-Sb(1) bond length is 3.70 Å. The Yb(4)-Sb(2) bond length is 3.69 Å. The Yb(4)-Sb(5) bond length is 3.48 Å. Both Yb(4)-Sb(7) bond lengths are 3.53 Å. Both Yb(4)-Sb(8) bond lengths are 2.93 Å. In the fifth Yb site, Yb(5) is bonded in a 7-coordinate geometry to one Sb(6), two equivalent Sb(3), two equivalent Sb(7), and two equivalent Sb(8) atoms. The Yb(5)-Sb(6) bond length is 3.50 Å. Both Yb(5)-Sb(3) bond lengths are 3.69 Å. Both Yb(5)-Sb(7) bond lengths are 3.54 Å. Both Yb(5)-Sb(8) bond lengths are 2.93 Å. In the sixth Yb site, Yb(6) is bonded to one Sb(4), one Sb(7), one Sb(8), two equivalent Sb(1), and two equivalent Sb(3) atoms to form a mixture of distorted edge, face, and corner-sharing YbSb7 pentagonal bipyramids. The Yb(6)-Sb(4) bond length is 3.13 Å. The Yb(6)-Sb(7) bond length is 3.17 Å. The Yb(6)-Sb(8) bond length is 3.43 Å. There is one shorter (3.42 Å) and one longer (3.54 Å) Yb(6)-Sb(1) bond length. There is one shorter (3.41 Å) and one longer (3.53 Å) Yb(6)-Sb(3) bond length. In the seventh Yb site, Yb(7) is bonded to one Sb(4), one Sb(7), one Sb(8), two equivalent Sb(2), and two equivalent Sb(3) atoms to form a mixture of distorted edge, face, and corner-sharing YbSb7 pentagonal bipyramids. The Yb(7)-Sb(4) bond length is 3.13 Å. The Yb(7)-Sb(7) bond length is 3.17 Å. The Yb(7)-Sb(8) bond length is 3.43 Å. There is one shorter (3.42 Å) and one longer (3.53 Å) Yb(7)-Sb(2) bond length. There is one shorter (3.42 Å) and one longer (3.53 Å) Yb(7)-Sb(3) bond length. There are eight inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 10-coordinate geometry to one Yb(3), one Yb(4), two equivalent Yb(2), four equivalent Yb(6), one Sb(1), and one Sb(5) atom. The Sb(1)-Sb(1) bond length is 2.94 Å. The Sb(1)-Sb(5) bond length is 3.28 Å. In the second Sb site, Sb(2) is bonded in a 10-coordinate geometry to one Yb(3), one Yb(4), two equivalent Yb(1), four equivalent Yb(7), one Sb(2), and one Sb(5) atom. The Sb(2)-Sb(2) bond length is 2.94 Å. The Sb(2)-Sb(5) bond length is 3.29 Å. In the third Sb site, Sb(3) is bonded in a 10-coordinate geometry to one Yb(1), one Yb(2), one Yb(3), one Yb(5), two equivalent Yb(6), two equivalent Yb(7), one Sb(3), and one Sb(6) atom. The Sb(3)-Sb(3) bond length is 2.93 Å. The Sb(3)-Sb(6) bond length is 3.30 Å. In the fourth Sb site, Sb(4) is bonded in a 8-coordinate geometry to two equivalent Yb(1), two equivalent Yb(2), two equivalent Yb(6), and two equivalent Yb(7) atoms. In the fifth Sb site, Sb(5) is bonded in a 11-coordinate geometry to one Yb(4), two equivalent Yb(1), two equivalent Yb(2), two equivalent Yb(3), one Sb(1), one Sb(2), and two equivalent Sb(6) atoms. Both Sb(5)-Sb(6) bond lengths are 3.01 Å. In the sixth Sb site, Sb(6) is bonded in a 11-coordinate geometry to one Yb(5), two equivalent Yb(1), two equivalent Yb(2), two equivalent Yb(3), two equivalent Sb(3), and two equivalent Sb(5) atoms. In the seventh Sb site, Sb(7) is bonded in a 9-coordinate geometry to one Yb(3), two equivalent Yb(4), two equivalent Yb(5), two equivalent Yb(6), and two equivalent Yb(7) atoms. In the eighth Sb site, Sb(8) is bonded in a 8-coordinate geometry to one Yb(4), one Yb(5), one Yb(6), one Yb(7), two equivalent Yb(1), and two equivalent Yb(2) atoms.