Ta11O2 crystallizes in the triclinic P1 space group. There are twenty-two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a single-bond geometry to one Ta(20) and one O(4) atom. In the second Ta site, Ta(2) is bonded in a 1-coordinate geometry to one Ta(10), one Ta(16), and one Ta(21) atom. In the third Ta site, Ta(3) is bonded in a 4-coordinate geometry to one Ta(22), one Ta(6), one O(2), and one O(4) atom. In the fourth Ta site, Ta(4) is bonded in a distorted single-bond geometry to one Ta(10), one Ta(15), one Ta(5), and one O(1) atom. In the fifth Ta site, Ta(5) is bonded in a 3-coordinate geometry to one Ta(19), one Ta(4), one Ta(8), and one O(1) atom. In the sixth Ta site, Ta(6) is bonded in a 2-coordinate geometry to one Ta(16), one Ta(3), and one O(1) atom. In the seventh Ta site, Ta(7) is bonded in a 2-coordinate geometry to one Ta(10), one Ta(15), one Ta(17), and one Ta(21) atom. In the eighth Ta site, Ta(8) is bonded in a distorted single-bond geometry to one Ta(5), one Ta(9), and one O(4) atom. In the ninth Ta site, Ta(9) is bonded in a 3-coordinate geometry to one Ta(19), one Ta(20), and one Ta(8) atom. In the tenth Ta site, Ta(10) is bonded in a 4-coordinate geometry to one Ta(19), one Ta(2), one Ta(4), and one Ta(7) atom. In the eleventh Ta site, Ta(11) is bonded in a single-bond geometry to one O(1) and one O(3) atom. In the twelfth Ta site, Ta(12) is bonded in a distorted single-bond geometry to one Ta(21) and one O(3) atom. In the thirteenth Ta site, Ta(13) is bonded in a distorted single-bond geometry to one O(3) atom. In the fourteenth Ta site, Ta(14) is bonded in a distorted single-bond geometry to one Ta(20) and one O(3) atom. In the fifteenth Ta site, Ta(15) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(20), one Ta(4), one Ta(7), and one O(2) atom. In the sixteenth Ta site, Ta(16) is bonded in a distorted rectangular see-saw-like geometry to one Ta(18), one Ta(19), one Ta(2), and one Ta(6) atom. In the seventeenth Ta site, Ta(17) is bonded in a distorted water-like geometry to one Ta(7) and one O(1) atom. In the eighteenth Ta site, Ta(18) is bonded in a 3-coordinate geometry to one Ta(15), one Ta(16), and one O(2) atom. In the nineteenth Ta site, Ta(19) is bonded in a 4-coordinate geometry to one Ta(10), one Ta(16), one Ta(5), and one Ta(9) atom. In the twentieth Ta site, Ta(20) is bonded in a 5-coordinate geometry to one Ta(1), one Ta(14), one Ta(15), one Ta(9), and one O(2) atom. In the twenty-first Ta site, Ta(21) is bonded in a 4-coordinate geometry to one Ta(12), one Ta(2), one Ta(22), and one Ta(7) atom. In the twenty-second Ta site, Ta(22) is bonded in a single-bond geometry to one Ta(21), one Ta(3), one O(2), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ta(11), one Ta(17), one Ta(4), one Ta(5), and one Ta(6) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ta(15), one Ta(18), one Ta(20), one Ta(22), and one Ta(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ta(11), one Ta(12), one Ta(13), and one Ta(14) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ta(1), one Ta(22), one Ta(3), and one Ta(8) atom.
Ta11O2 crystallizes in the triclinic P1 space group. There are twenty-two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a single-bond geometry to one Ta(20) and one O(4) atom. The Ta(1)-Ta(20) bond length is 2.24 Å. The Ta(1)-O(4) bond length is 1.51 Å. In the second Ta site, Ta(2) is bonded in a 1-coordinate geometry to one Ta(10), one Ta(16), and one Ta(21) atom. The Ta(2)-Ta(10) bond length is 2.31 Å. The Ta(2)-Ta(16) bond length is 2.27 Å. The Ta(2)-Ta(21) bond length is 1.60 Å. In the third Ta site, Ta(3) is bonded in a 4-coordinate geometry to one Ta(22), one Ta(6), one O(2), and one O(4) atom. The Ta(3)-Ta(22) bond length is 1.89 Å. The Ta(3)-Ta(6) bond length is 1.59 Å. The Ta(3)-O(2) bond length is 2.20 Å. The Ta(3)-O(4) bond length is 2.12 Å. In the fourth Ta site, Ta(4) is bonded in a distorted single-bond geometry to one Ta(10), one Ta(15), one Ta(5), and one O(1) atom. The Ta(4)-Ta(10) bond length is 2.60 Å. The Ta(4)-Ta(15) bond length is 1.91 Å. The Ta(4)-Ta(5) bond length is 1.72 Å. The Ta(4)-O(1) bond length is 2.18 Å. In the fifth Ta site, Ta(5) is bonded in a 3-coordinate geometry to one Ta(19), one Ta(4), one Ta(8), and one O(1) atom. The Ta(5)-Ta(19) bond length is 2.63 Å. The Ta(5)-Ta(8) bond length is 1.89 Å. The Ta(5)-O(1) bond length is 2.34 Å. In the sixth Ta site, Ta(6) is bonded in a 2-coordinate geometry to one Ta(16), one Ta(3), and one O(1) atom. The Ta(6)-Ta(16) bond length is 2.41 Å. The Ta(6)-O(1) bond length is 2.31 Å. In the seventh Ta site, Ta(7) is bonded in a 2-coordinate geometry to one Ta(10), one Ta(15), one Ta(17), and one Ta(21) atom. The Ta(7)-Ta(10) bond length is 1.89 Å. The Ta(7)-Ta(15) bond length is 2.50 Å. The Ta(7)-Ta(17) bond length is 1.56 Å. The Ta(7)-Ta(21) bond length is 2.63 Å. In the eighth Ta site, Ta(8) is bonded in a distorted single-bond geometry to one Ta(5), one Ta(9), and one O(4) atom. The Ta(8)-Ta(9) bond length is 2.28 Å. The Ta(8)-O(4) bond length is 1.97 Å. In the ninth Ta site, Ta(9) is bonded in a 3-coordinate geometry to one Ta(19), one Ta(20), and one Ta(8) atom. The Ta(9)-Ta(19) bond length is 1.58 Å. The Ta(9)-Ta(20) bond length is 1.99 Å. In the tenth Ta site, Ta(10) is bonded in a 4-coordinate geometry to one Ta(19), one Ta(2), one Ta(4), and one Ta(7) atom. The Ta(10)-Ta(19) bond length is 2.06 Å. In the eleventh Ta site, Ta(11) is bonded in a single-bond geometry to one O(1) and one O(3) atom. The Ta(11)-O(1) bond length is 2.82 Å. The Ta(11)-O(3) bond length is 1.57 Å. In the twelfth Ta site, Ta(12) is bonded in a distorted single-bond geometry to one Ta(21) and one O(3) atom. The Ta(12)-Ta(21) bond length is 1.77 Å. The Ta(12)-O(3) bond length is 1.92 Å. In the thirteenth Ta site, Ta(13) is bonded in a distorted single-bond geometry to one O(3) atom. The Ta(13)-O(3) bond length is 2.10 Å. In the fourteenth Ta site, Ta(14) is bonded in a distorted single-bond geometry to one Ta(20) and one O(3) atom. The Ta(14)-Ta(20) bond length is 1.76 Å. The Ta(14)-O(3) bond length is 1.98 Å. In the fifteenth Ta site, Ta(15) is bonded in a 5-coordinate geometry to one Ta(18), one Ta(20), one Ta(4), one Ta(7), and one O(2) atom. The Ta(15)-Ta(18) bond length is 1.73 Å. The Ta(15)-Ta(20) bond length is 2.48 Å. The Ta(15)-O(2) bond length is 2.49 Å. In the sixteenth Ta site, Ta(16) is bonded in a distorted rectangular see-saw-like geometry to one Ta(18), one Ta(19), one Ta(2), and one Ta(6) atom. The Ta(16)-Ta(18) bond length is 1.73 Å. The Ta(16)-Ta(19) bond length is 2.43 Å. In the seventeenth Ta site, Ta(17) is bonded in a distorted water-like geometry to one Ta(7) and one O(1) atom. The Ta(17)-O(1) bond length is 2.63 Å. In the eighteenth Ta site, Ta(18) is bonded in a 3-coordinate geometry to one Ta(15), one Ta(16), and one O(2) atom. The Ta(18)-O(2) bond length is 2.41 Å. In the nineteenth Ta site, Ta(19) is bonded in a 4-coordinate geometry to one Ta(10), one Ta(16), one Ta(5), and one Ta(9) atom. In the twentieth Ta site, Ta(20) is bonded in a 5-coordinate geometry to one Ta(1), one Ta(14), one Ta(15), one Ta(9), and one O(2) atom. The Ta(20)-O(2) bond length is 3.10 Å. In the twenty-first Ta site, Ta(21) is bonded in a 4-coordinate geometry to one Ta(12), one Ta(2), one Ta(22), and one Ta(7) atom. The Ta(21)-Ta(22) bond length is 2.30 Å. In the twenty-second Ta site, Ta(22) is bonded in a single-bond geometry to one Ta(21), one Ta(3), one O(2), and one O(4) atom. The Ta(22)-O(2) bond length is 2.34 Å. The Ta(22)-O(4) bond length is 1.55 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Ta(11), one Ta(17), one Ta(4), one Ta(5), and one Ta(6) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ta(15), one Ta(18), one Ta(20), one Ta(22), and one Ta(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Ta(11), one Ta(12), one Ta(13), and one Ta(14) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Ta(1), one Ta(22), one Ta(3), and one Ta(8) atom.