Ba2As6O11 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one As(5), one O(1), one O(10), one O(11), one O(5), one O(6), one O(7), and one O(9) atom. In the second Ba site, Ba(2) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(4), one O(7), and one O(8) atom. There are six inequivalent As sites. In the first As site, As(1) is bonded in a 3-coordinate geometry to one O(5), one O(6), and one O(9) atom. In the second As site, As(2) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(7) atom. In the third As site, As(3) is bonded in a water-like geometry to one O(10) and one O(3) atom. In the fourth As site, As(4) is bonded in a water-like geometry to one O(2) and one O(8) atom. In the fifth As site, As(5) is bonded in a 3-coordinate geometry to one Ba(1), one O(4), one O(6), and one O(8) atom. In the sixth As site, As(6) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(9) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one As(6), and one O(11) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Ba(2), one As(4), and one As(6) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ba(2) and one As(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one As(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ba(1), one As(1), and one As(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(2), and one As(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ba(2), one As(4), and one As(5) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one As(1), and one As(6) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ba(1), one Ba(2), and one As(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Ba(1) and one O(1) atom.
Ba2As6O11 crystallizes in the triclinic P1 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one As(5), one O(1), one O(10), one O(11), one O(5), one O(6), one O(7), and one O(9) atom. The Ba(1)-As(5) bond length is 3.64 Å. The Ba(1)-O(1) bond length is 2.68 Å. The Ba(1)-O(10) bond length is 2.65 Å. The Ba(1)-O(11) bond length is 2.72 Å. The Ba(1)-O(5) bond length is 3.18 Å. The Ba(1)-O(6) bond length is 2.73 Å. The Ba(1)-O(7) bond length is 2.67 Å. The Ba(1)-O(9) bond length is 3.00 Å. In the second Ba site, Ba(2) is bonded in a 5-coordinate geometry to one O(10), one O(2), one O(4), one O(7), and one O(8) atom. The Ba(2)-O(10) bond length is 2.67 Å. The Ba(2)-O(2) bond length is 2.75 Å. The Ba(2)-O(4) bond length is 2.74 Å. The Ba(2)-O(7) bond length is 2.54 Å. The Ba(2)-O(8) bond length is 2.83 Å. There are six inequivalent As sites. In the first As site, As(1) is bonded in a 3-coordinate geometry to one O(5), one O(6), and one O(9) atom. The As(1)-O(5) bond length is 1.77 Å. The As(1)-O(6) bond length is 1.87 Å. The As(1)-O(9) bond length is 1.95 Å. In the second As site, As(2) is bonded in a 3-coordinate geometry to one O(3), one O(5), and one O(7) atom. The As(2)-O(3) bond length is 1.85 Å. The As(2)-O(5) bond length is 2.00 Å. The As(2)-O(7) bond length is 1.76 Å. In the third As site, As(3) is bonded in a water-like geometry to one O(10) and one O(3) atom. The As(3)-O(10) bond length is 1.79 Å. The As(3)-O(3) bond length is 1.83 Å. In the fourth As site, As(4) is bonded in a water-like geometry to one O(2) and one O(8) atom. The As(4)-O(2) bond length is 1.87 Å. The As(4)-O(8) bond length is 1.84 Å. In the fifth As site, As(5) is bonded in a 3-coordinate geometry to one Ba(1), one O(4), one O(6), and one O(8) atom. The As(5)-O(4) bond length is 1.73 Å. The As(5)-O(6) bond length is 1.84 Å. The As(5)-O(8) bond length is 1.90 Å. In the sixth As site, As(6) is bonded in a distorted T-shaped geometry to one O(1), one O(2), and one O(9) atom. The As(6)-O(1) bond length is 1.89 Å. The As(6)-O(2) bond length is 1.87 Å. The As(6)-O(9) bond length is 1.84 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one As(6), and one O(11) atom. The O(1)-O(11) bond length is 1.48 Å. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Ba(2), one As(4), and one As(6) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one As(2) and one As(3) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Ba(2) and one As(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one As(1), and one As(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Ba(1), one As(1), and one As(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(2), and one As(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ba(2), one As(4), and one As(5) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one As(1), and one As(6) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Ba(1), one Ba(2), and one As(3) atom. In the eleventh O site, O(11) is bonded in a 2-coordinate geometry to one Ba(1) and one O(1) atom.