BaW6O19 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to one O(10), one O(9), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(7), and two equivalent O(6) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-31°. In the second W site, W(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(9), two equivalent O(4), and two equivalent O(8) atoms. In the third W site, W(3) is bonded to one O(1), one O(2), one O(4), one O(8), and two equivalent O(5) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-32°. In the fourth W site, W(4) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(9), two equivalent O(3), and two equivalent O(7) atoms. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one W(3) atom. In the second O site, O(2) is bonded in a linear geometry to one W(1) and one W(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(1) and one W(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one W(2), and one W(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and two equivalent W(3) atoms. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one W(1) and one W(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one W(2), and one W(3) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one W(2), one W(4), and one O(10) atom. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one W(2), one W(4), and one O(9) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one W(2) and one W(4) atom.
BaW6O19 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 8-coordinate geometry to one O(10), one O(9), two equivalent O(4), two equivalent O(5), and two equivalent O(8) atoms. The Ba(1)-O(10) bond length is 3.00 Å. The Ba(1)-O(9) bond length is 3.19 Å. Both Ba(1)-O(4) bond lengths are 3.03 Å. Both Ba(1)-O(5) bond lengths are 3.00 Å. Both Ba(1)-O(8) bond lengths are 2.94 Å. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(7), and two equivalent O(6) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-31°. The W(1)-O(1) bond length is 1.98 Å. The W(1)-O(2) bond length is 1.95 Å. The W(1)-O(3) bond length is 1.93 Å. The W(1)-O(7) bond length is 1.92 Å. Both W(1)-O(6) bond lengths are 1.95 Å. In the second W site, W(2) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(9), two equivalent O(4), and two equivalent O(8) atoms. The W(2)-O(10) bond length is 2.17 Å. The W(2)-O(11) bond length is 1.96 Å. The W(2)-O(9) bond length is 2.13 Å. Both W(2)-O(4) bond lengths are 2.00 Å. Both W(2)-O(8) bond lengths are 2.00 Å. In the third W site, W(3) is bonded to one O(1), one O(2), one O(4), one O(8), and two equivalent O(5) atoms to form corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-32°. The W(3)-O(1) bond length is 1.91 Å. The W(3)-O(2) bond length is 2.00 Å. The W(3)-O(4) bond length is 1.93 Å. The W(3)-O(8) bond length is 1.94 Å. Both W(3)-O(5) bond lengths are 1.95 Å. In the fourth W site, W(4) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(9), two equivalent O(3), and two equivalent O(7) atoms. The W(4)-O(10) bond length is 2.17 Å. The W(4)-O(11) bond length is 1.83 Å. The W(4)-O(9) bond length is 2.15 Å. Both W(4)-O(3) bond lengths are 1.96 Å. Both W(4)-O(7) bond lengths are 1.97 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one W(3) atom. In the second O site, O(2) is bonded in a linear geometry to one W(1) and one W(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(1) and one W(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one W(2), and one W(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ba(1) and two equivalent W(3) atoms. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one W(1) and one W(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one W(2), and one W(3) atom. In the ninth O site, O(9) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one W(2), one W(4), and one O(10) atom. The O(9)-O(10) bond length is 1.51 Å. In the tenth O site, O(10) is bonded in a distorted rectangular see-saw-like geometry to one Ba(1), one W(2), one W(4), and one O(9) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one W(2) and one W(4) atom.