Y4W13Si2Sb2O28 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(14), one O(5), one O(8), one O(9), and two equivalent O(2) atoms. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(9), and two equivalent O(14) atoms. There are seven inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(12), one O(2), one O(7), and one O(8) atom to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra and  an edgeedge with one W(3)O5 square pyramid. In the second W site, W(2) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(3), and one O(7) atom. In the third W site, W(3) is bonded to one O(1), one O(11), one O(13), one O(14), and one O(8) atom to form distorted WO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra and  an edgeedge with one W(1)O5 trigonal bipyramid. In the fourth W site, W(4) is bonded in a 6-coordinate geometry to one O(12), one O(13), two equivalent O(5), and two equivalent O(9) atoms. In the fifth W site, W(5) is bonded in a 4-coordinate geometry to one O(11), one O(3), one O(6), and one O(8) atom. In the sixth W site, W(6) is bonded to two equivalent O(10), two equivalent O(4), and two equivalent O(6) atoms to form distorted WO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra. In the seventh W site, W(7) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(13), one O(6), and two equivalent O(4) atoms. Si(1) is bonded to one O(11), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(3)O5 square pyramid, and  a cornercorner with one W(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 66°. Sb(1) is bonded in a single-bond geometry to one O(6) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Y(2), one W(1), one W(2), and one W(3) atom to form OYW3 tetrahedra that share  a cornercorner with one O(5)Y2W2 tetrahedra,  a cornercorner with one O(14)Y3W tetrahedra, corners with two equivalent O(2)Y3W tetrahedra,  an edgeedge with one O(14)Y3W tetrahedra, and  an edgeedge with one O(8)YW3 tetrahedra. In the second O site, O(2) is bonded to one Y(2), two equivalent Y(1), and one W(1) atom to form OY3W tetrahedra that share  a cornercorner with one O(8)YW3 tetrahedra, corners with two equivalent O(14)Y3W tetrahedra, corners with two equivalent O(1)YW3 tetrahedra, corners with three equivalent O(5)Y2W2 tetrahedra,  an edgeedge with one O(14)Y3W tetrahedra,  an edgeedge with one O(2)Y3W tetrahedra, and  an edgeedge with one O(8)YW3 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one W(2), one W(5), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one W(6), two equivalent W(7), and one Si(1) atom. In the fifth O site, O(5) is bonded to one Y(1), one Y(2), and two equivalent W(4) atoms to form OY2W2 tetrahedra that share  a cornercorner with one O(14)Y3W tetrahedra,  a cornercorner with one O(1)YW3 tetrahedra,  a cornercorner with one O(8)YW3 tetrahedra, corners with three equivalent O(2)Y3W tetrahedra,  an edgeedge with one O(5)Y2W2 tetrahedra, and  an edgeedge with one O(14)Y3W tetrahedra. In the sixth O site, O(6) is bonded to one W(5), one W(6), one W(7), and one Sb(1) atom to form OSbW3 tetrahedra that share  a cornercorner with one O(6)SbW3 tetrahedra and  a cornercorner with one O(8)YW3 tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Si(1) atom. In the eighth O site, O(8) is bonded to one Y(1), one W(1), one W(3), and one W(5) atom to form OYW3 tetrahedra that share  a cornercorner with one O(6)SbW3 tetrahedra,  a cornercorner with one O(5)Y2W2 tetrahedra,  a cornercorner with one O(2)Y3W tetrahedra, corners with two equivalent O(14)Y3W tetrahedra,  an edgeedge with one O(2)Y3W tetrahedra, and  an edgeedge with one O(1)YW3 tetrahedra. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Y(1), one Y(2), and two equivalent W(4) atoms. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one W(2), one W(6), and one W(7) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one W(3), one W(5), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one W(1), one W(4), and one W(7) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one W(3), one W(4), and one W(7) atom. In the fourteenth O site, O(14) is bonded to one Y(1), two equivalent Y(2), and one W(3) atom to form OY3W tetrahedra that share  a cornercorner with one O(5)Y2W2 tetrahedra,  a cornercorner with one O(1)YW3 tetrahedra, corners with two equivalent O(2)Y3W tetrahedra, corners with two equivalent O(8)YW3 tetrahedra,  an edgeedge with one O(5)Y2W2 tetrahedra,  an edgeedge with one O(14)Y3W tetrahedra,  an edgeedge with one O(2)Y3W tetrahedra, and  an edgeedge with one O(1)YW3 tetrahedra.
Y4W13Si2Sb2O28 crystallizes in the triclinic P-1 space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded in a 6-coordinate geometry to one O(14), one O(5), one O(8), one O(9), and two equivalent O(2) atoms. The Y(1)-O(14) bond length is 2.26 Å. The Y(1)-O(5) bond length is 2.37 Å. The Y(1)-O(8) bond length is 2.26 Å. The Y(1)-O(9) bond length is 2.57 Å. There is one shorter (2.18 Å) and one longer (2.49 Å) Y(1)-O(2) bond length. In the second Y site, Y(2) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(9), and two equivalent O(14) atoms. The Y(2)-O(1) bond length is 2.34 Å. The Y(2)-O(2) bond length is 2.22 Å. The Y(2)-O(5) bond length is 2.48 Å. The Y(2)-O(9) bond length is 2.41 Å. There is one shorter (2.23 Å) and one longer (2.47 Å) Y(2)-O(14) bond length. There are seven inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(12), one O(2), one O(7), and one O(8) atom to form distorted WO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra and  an edgeedge with one W(3)O5 square pyramid. The W(1)-O(1) bond length is 2.16 Å. The W(1)-O(12) bond length is 2.14 Å. The W(1)-O(2) bond length is 2.11 Å. The W(1)-O(7) bond length is 2.21 Å. The W(1)-O(8) bond length is 2.15 Å. In the second W site, W(2) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(3), and one O(7) atom. The W(2)-O(1) bond length is 2.10 Å. The W(2)-O(10) bond length is 2.10 Å. The W(2)-O(3) bond length is 2.23 Å. The W(2)-O(7) bond length is 2.27 Å. In the third W site, W(3) is bonded to one O(1), one O(11), one O(13), one O(14), and one O(8) atom to form distorted WO5 square pyramids that share  a cornercorner with one Si(1)O4 tetrahedra and  an edgeedge with one W(1)O5 trigonal bipyramid. The W(3)-O(1) bond length is 2.26 Å. The W(3)-O(11) bond length is 2.17 Å. The W(3)-O(13) bond length is 2.14 Å. The W(3)-O(14) bond length is 2.15 Å. The W(3)-O(8) bond length is 2.17 Å. In the fourth W site, W(4) is bonded in a 6-coordinate geometry to one O(12), one O(13), two equivalent O(5), and two equivalent O(9) atoms. The W(4)-O(12) bond length is 2.12 Å. The W(4)-O(13) bond length is 2.09 Å. There is one shorter (2.17 Å) and one longer (2.26 Å) W(4)-O(5) bond length. There is one shorter (2.21 Å) and one longer (2.24 Å) W(4)-O(9) bond length. In the fifth W site, W(5) is bonded in a 4-coordinate geometry to one O(11), one O(3), one O(6), and one O(8) atom. The W(5)-O(11) bond length is 2.38 Å. The W(5)-O(3) bond length is 2.17 Å. The W(5)-O(6) bond length is 2.38 Å. The W(5)-O(8) bond length is 2.05 Å. In the sixth W site, W(6) is bonded to two equivalent O(10), two equivalent O(4), and two equivalent O(6) atoms to form distorted WO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra. Both W(6)-O(10) bond lengths are 2.16 Å. Both W(6)-O(4) bond lengths are 2.24 Å. Both W(6)-O(6) bond lengths are 2.20 Å. In the seventh W site, W(7) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(13), one O(6), and two equivalent O(4) atoms. The W(7)-O(10) bond length is 2.06 Å. The W(7)-O(12) bond length is 2.12 Å. The W(7)-O(13) bond length is 2.17 Å. The W(7)-O(6) bond length is 2.24 Å. There is one shorter (2.39 Å) and one longer (2.46 Å) W(7)-O(4) bond length. Si(1) is bonded to one O(11), one O(3), one O(4), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one W(6)O6 octahedra,  a cornercorner with one W(3)O5 square pyramid, and  a cornercorner with one W(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 66°. The Si(1)-O(11) bond length is 1.62 Å. The Si(1)-O(3) bond length is 1.67 Å. The Si(1)-O(4) bond length is 1.67 Å. The Si(1)-O(7) bond length is 1.61 Å. Sb(1) is bonded in a single-bond geometry to one O(6) atom. The Sb(1)-O(6) bond length is 2.21 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Y(2), one W(1), one W(2), and one W(3) atom to form OYW3 tetrahedra that share  a cornercorner with one O(5)Y2W2 tetrahedra,  a cornercorner with one O(14)Y3W tetrahedra, corners with two equivalent O(2)Y3W tetrahedra,  an edgeedge with one O(14)Y3W tetrahedra, and  an edgeedge with one O(8)YW3 tetrahedra. In the second O site, O(2) is bonded to one Y(2), two equivalent Y(1), and one W(1) atom to form OY3W tetrahedra that share  a cornercorner with one O(8)YW3 tetrahedra, corners with two equivalent O(14)Y3W tetrahedra, corners with two equivalent O(1)YW3 tetrahedra, corners with three equivalent O(5)Y2W2 tetrahedra,  an edgeedge with one O(14)Y3W tetrahedra,  an edgeedge with one O(2)Y3W tetrahedra, and  an edgeedge with one O(8)YW3 tetrahedra. In the third O site, O(3) is bonded in a 3-coordinate geometry to one W(2), one W(5), and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one W(6), two equivalent W(7), and one Si(1) atom. In the fifth O site, O(5) is bonded to one Y(1), one Y(2), and two equivalent W(4) atoms to form OY2W2 tetrahedra that share  a cornercorner with one O(14)Y3W tetrahedra,  a cornercorner with one O(1)YW3 tetrahedra,  a cornercorner with one O(8)YW3 tetrahedra, corners with three equivalent O(2)Y3W tetrahedra,  an edgeedge with one O(5)Y2W2 tetrahedra, and  an edgeedge with one O(14)Y3W tetrahedra. In the sixth O site, O(6) is bonded to one W(5), one W(6), one W(7), and one Sb(1) atom to form OSbW3 tetrahedra that share  a cornercorner with one O(6)SbW3 tetrahedra and  a cornercorner with one O(8)YW3 tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Si(1) atom. In the eighth O site, O(8) is bonded to one Y(1), one W(1), one W(3), and one W(5) atom to form OYW3 tetrahedra that share  a cornercorner with one O(6)SbW3 tetrahedra,  a cornercorner with one O(5)Y2W2 tetrahedra,  a cornercorner with one O(2)Y3W tetrahedra, corners with two equivalent O(14)Y3W tetrahedra,  an edgeedge with one O(2)Y3W tetrahedra, and  an edgeedge with one O(1)YW3 tetrahedra. In the ninth O site, O(9) is bonded in a distorted see-saw-like geometry to one Y(1), one Y(2), and two equivalent W(4) atoms. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one W(2), one W(6), and one W(7) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one W(3), one W(5), and one Si(1) atom. In the twelfth O site, O(12) is bonded in a trigonal planar geometry to one W(1), one W(4), and one W(7) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one W(3), one W(4), and one W(7) atom. In the fourteenth O site, O(14) is bonded to one Y(1), two equivalent Y(2), and one W(3) atom to form OY3W tetrahedra that share  a cornercorner with one O(5)Y2W2 tetrahedra,  a cornercorner with one O(1)YW3 tetrahedra, corners with two equivalent O(2)Y3W tetrahedra, corners with two equivalent O(8)YW3 tetrahedra,  an edgeedge with one O(5)Y2W2 tetrahedra,  an edgeedge with one O(14)Y3W tetrahedra,  an edgeedge with one O(2)Y3W tetrahedra, and  an edgeedge with one O(1)YW3 tetrahedra.