Eu11Zn6Sb12 is Magnesium tetraboride-derived structured and crystallizes in the monoclinic C2/m space group. There are six inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 12-coordinate geometry to two equivalent Zn(2), two equivalent Zn(3), one Sb(1), one Sb(2), two equivalent Sb(4), and four equivalent Sb(5) atoms. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one Zn(1), one Sb(1), one Sb(2), two equivalent Sb(3), and two equivalent Sb(5) atoms. In the third Eu site, Eu(3) is bonded to one Sb(1), one Sb(2), two equivalent Sb(4), and two equivalent Sb(6) atoms to form EuSb6 octahedra that share corners with two equivalent Eu(6)Sb6 octahedra, edges with two equivalent Eu(3)Sb6 octahedra, edges with two equivalent Zn(2)Eu3Sb4 tetrahedra, and  a faceface with one Eu(6)Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. In the fourth Eu site, Eu(4) is bonded in a 6-coordinate geometry to three equivalent Zn(1), one Sb(1), two equivalent Sb(6), and three equivalent Sb(3) atoms. In the fifth Eu site, Eu(5) is bonded in a 9-coordinate geometry to one Zn(2), two equivalent Zn(1), one Sb(3), two equivalent Sb(2), and three equivalent Sb(6) atoms. In the sixth Eu site, Eu(6) is bonded to two equivalent Sb(1) and four equivalent Sb(4) atoms to form distorted EuSb6 octahedra that share corners with four equivalent Eu(3)Sb6 octahedra, corners with four equivalent Zn(2)Eu3Sb4 tetrahedra, edges with two equivalent Eu(6)Sb6 octahedra, and faces with two equivalent Eu(3)Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 10-coordinate geometry to one Eu(2), two equivalent Eu(5), three equivalent Eu(4), one Sb(2), one Sb(6), and two equivalent Sb(3) atoms. In the second Zn site, Zn(2) is bonded to one Eu(5), two equivalent Eu(1), one Sb(4), one Sb(5), and two equivalent Sb(2) atoms to form distorted ZnEu3Sb4 tetrahedra that share corners with two equivalent Eu(6)Sb6 octahedra, edges with two equivalent Eu(3)Sb6 octahedra, and edges with two equivalent Zn(2)Eu3Sb4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. In the third Zn site, Zn(3) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one Sb(4), one Sb(5), and two equivalent Sb(1) atoms. There are six inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 6-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(6), and two equivalent Zn(3) atoms. In the second Sb site, Sb(2) is bonded in a 7-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), two equivalent Eu(5), one Zn(1), and two equivalent Zn(2) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Eu(5), two equivalent Eu(2), three equivalent Eu(4), and two equivalent Zn(1) atoms. In the fourth Sb site, Sb(4) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(3), two equivalent Eu(6), one Zn(2), and one Zn(3) atom. In the fifth Sb site, Sb(5) is bonded in a 9-coordinate geometry to two equivalent Eu(2), four equivalent Eu(1), one Zn(2), one Zn(3), and one Sb(5) atom. In the sixth Sb site, Sb(6) is bonded in a 8-coordinate geometry to two equivalent Eu(3), two equivalent Eu(4), three equivalent Eu(5), and one Zn(1) atom.
Eu11Zn6Sb12 is Magnesium tetraboride-derived structured and crystallizes in the monoclinic C2/m space group. There are six inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 12-coordinate geometry to two equivalent Zn(2), two equivalent Zn(3), one Sb(1), one Sb(2), two equivalent Sb(4), and four equivalent Sb(5) atoms. Both Eu(1)-Zn(2) bond lengths are 3.38 Å. Both Eu(1)-Zn(3) bond lengths are 3.46 Å. The Eu(1)-Sb(1) bond length is 3.82 Å. The Eu(1)-Sb(2) bond length is 3.82 Å. Both Eu(1)-Sb(4) bond lengths are 3.37 Å. There are two shorter (3.40 Å) and two longer (3.49 Å) Eu(1)-Sb(5) bond lengths. In the second Eu site, Eu(2) is bonded in a 7-coordinate geometry to one Zn(1), one Sb(1), one Sb(2), two equivalent Sb(3), and two equivalent Sb(5) atoms. The Eu(2)-Zn(1) bond length is 3.18 Å. The Eu(2)-Sb(1) bond length is 3.16 Å. The Eu(2)-Sb(2) bond length is 3.13 Å. Both Eu(2)-Sb(3) bond lengths are 3.36 Å. Both Eu(2)-Sb(5) bond lengths are 3.22 Å. In the third Eu site, Eu(3) is bonded to one Sb(1), one Sb(2), two equivalent Sb(4), and two equivalent Sb(6) atoms to form EuSb6 octahedra that share corners with two equivalent Eu(6)Sb6 octahedra, edges with two equivalent Eu(3)Sb6 octahedra, edges with two equivalent Zn(2)Eu3Sb4 tetrahedra, and  a faceface with one Eu(6)Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. The Eu(3)-Sb(1) bond length is 3.25 Å. The Eu(3)-Sb(2) bond length is 3.15 Å. Both Eu(3)-Sb(4) bond lengths are 3.46 Å. Both Eu(3)-Sb(6) bond lengths are 3.41 Å. In the fourth Eu site, Eu(4) is bonded in a 6-coordinate geometry to three equivalent Zn(1), one Sb(1), two equivalent Sb(6), and three equivalent Sb(3) atoms. There are two shorter (3.59 Å) and one longer (3.81 Å) Eu(4)-Zn(1) bond length. The Eu(4)-Sb(1) bond length is 3.37 Å. Both Eu(4)-Sb(6) bond lengths are 3.51 Å. There is one shorter (3.20 Å) and two longer (3.43 Å) Eu(4)-Sb(3) bond lengths. In the fifth Eu site, Eu(5) is bonded in a 9-coordinate geometry to one Zn(2), two equivalent Zn(1), one Sb(3), two equivalent Sb(2), and three equivalent Sb(6) atoms. The Eu(5)-Zn(2) bond length is 3.58 Å. Both Eu(5)-Zn(1) bond lengths are 3.31 Å. The Eu(5)-Sb(3) bond length is 3.70 Å. Both Eu(5)-Sb(2) bond lengths are 3.22 Å. There are two shorter (3.39 Å) and one longer (3.56 Å) Eu(5)-Sb(6) bond length. In the sixth Eu site, Eu(6) is bonded to two equivalent Sb(1) and four equivalent Sb(4) atoms to form distorted EuSb6 octahedra that share corners with four equivalent Eu(3)Sb6 octahedra, corners with four equivalent Zn(2)Eu3Sb4 tetrahedra, edges with two equivalent Eu(6)Sb6 octahedra, and faces with two equivalent Eu(3)Sb6 octahedra. The corner-sharing octahedral tilt angles are 50°. Both Eu(6)-Sb(1) bond lengths are 3.23 Å. All Eu(6)-Sb(4) bond lengths are 3.37 Å. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 10-coordinate geometry to one Eu(2), two equivalent Eu(5), three equivalent Eu(4), one Sb(2), one Sb(6), and two equivalent Sb(3) atoms. The Zn(1)-Sb(2) bond length is 2.97 Å. The Zn(1)-Sb(6) bond length is 2.72 Å. Both Zn(1)-Sb(3) bond lengths are 2.85 Å. In the second Zn site, Zn(2) is bonded to one Eu(5), two equivalent Eu(1), one Sb(4), one Sb(5), and two equivalent Sb(2) atoms to form distorted ZnEu3Sb4 tetrahedra that share corners with two equivalent Eu(6)Sb6 octahedra, edges with two equivalent Eu(3)Sb6 octahedra, and edges with two equivalent Zn(2)Eu3Sb4 tetrahedra. The corner-sharing octahedral tilt angles are 45°. The Zn(2)-Sb(4) bond length is 2.73 Å. The Zn(2)-Sb(5) bond length is 2.84 Å. Both Zn(2)-Sb(2) bond lengths are 2.79 Å. In the third Zn site, Zn(3) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one Sb(4), one Sb(5), and two equivalent Sb(1) atoms. The Zn(3)-Sb(4) bond length is 2.79 Å. The Zn(3)-Sb(5) bond length is 3.13 Å. Both Zn(3)-Sb(1) bond lengths are 2.76 Å. There are six inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 6-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), one Eu(4), one Eu(6), and two equivalent Zn(3) atoms. In the second Sb site, Sb(2) is bonded in a 7-coordinate geometry to one Eu(1), one Eu(2), one Eu(3), two equivalent Eu(5), one Zn(1), and two equivalent Zn(2) atoms. In the third Sb site, Sb(3) is bonded in a 8-coordinate geometry to one Eu(5), two equivalent Eu(2), three equivalent Eu(4), and two equivalent Zn(1) atoms. In the fourth Sb site, Sb(4) is bonded in a 8-coordinate geometry to two equivalent Eu(1), two equivalent Eu(3), two equivalent Eu(6), one Zn(2), and one Zn(3) atom. In the fifth Sb site, Sb(5) is bonded in a 9-coordinate geometry to two equivalent Eu(2), four equivalent Eu(1), one Zn(2), one Zn(3), and one Sb(5) atom. The Sb(5)-Sb(5) bond length is 2.86 Å. In the sixth Sb site, Sb(6) is bonded in a 8-coordinate geometry to two equivalent Eu(3), two equivalent Eu(4), three equivalent Eu(5), and one Zn(1) atom.