K6As8O19 crystallizes in the triclinic P1 space group. There are six inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(19), one O(8), and two equivalent O(9) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(10), one O(15), one O(16), one O(7), and two equivalent O(8) atoms. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(3), one O(4), one O(5), one O(6), and two equivalent O(11) atoms. In the fourth K site, K(4) is bonded in a 9-coordinate geometry to one O(11), one O(19), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(12) atoms. In the fifth K site, K(5) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(14), one O(17), and two equivalent O(1) atoms. In the sixth K site, K(6) is bonded in a 7-coordinate geometry to one O(12), one O(15), one O(16), one O(17), one O(18), and two equivalent O(2) atoms. There are eight inequivalent As sites. In the first As site, As(1) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(9) atom. In the second As site, As(2) is bonded in a distorted T-shaped geometry to one O(10), one O(5), and one O(6) atom. In the third As site, As(3) is bonded in a distorted T-shaped geometry to one O(1), one O(13), and one O(14) atom. In the fourth As site, As(4) is bonded in a distorted T-shaped geometry to one O(15), one O(16), and one O(2) atom. In the fifth As site, As(5) is bonded in a distorted T-shaped geometry to one O(11), one O(3), and one O(4) atom. In the sixth As site, As(6) is bonded in a distorted T-shaped geometry to one O(12), one O(5), and one O(6) atom. In the seventh As site, As(7) is bonded in a distorted trigonal non-coplanar geometry to one O(13), one O(14), and one O(7) atom. In the eighth As site, As(8) is bonded in a distorted T-shaped geometry to one O(15), one O(16), and one O(8) atom. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(5), and one As(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(4), two equivalent K(6), and one As(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(1), and one As(5) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(1), and one As(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(2), and one As(6) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(2), and one As(6) atom. In the seventh O site, O(7) is bonded in a linear geometry to one K(2) and one As(7) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), and one As(8) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to two equivalent K(1) and one As(1) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one K(2), one As(2), and one O(18) atom. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one K(4), one K(5), two equivalent K(3), and one As(5) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(3), one K(6), two equivalent K(4), and one As(6) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one K(1), one K(5), one As(3), and one As(7) atom. In the fourteenth O site, O(14) is bonded in a distorted tetrahedral geometry to one K(1), one K(5), one As(3), and one As(7) atom. In the fifteenth O site, O(15) is bonded to one K(2), one K(6), one As(4), and one As(8) atom to form distorted edge-sharing OK2As2 tetrahedra. In the sixteenth O site, O(16) is bonded to one K(2), one K(6), one As(4), and one As(8) atom to form distorted edge-sharing OK2As2 tetrahedra. In the seventeenth O site, O(17) is bonded in a distorted trigonal non-coplanar geometry to one K(5), one K(6), and one O(19) atom. In the eighteenth O site, O(18) is bonded in a water-like geometry to one K(6) and one O(10) atom. In the nineteenth O site, O(19) is bonded in a 2-coordinate geometry to one K(1), one K(4), and one O(17) atom.
K6As8O19 crystallizes in the triclinic P1 space group. There are six inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(13), one O(14), one O(19), one O(8), and two equivalent O(9) atoms. The K(1)-O(13) bond length is 2.89 Å. The K(1)-O(14) bond length is 2.87 Å. The K(1)-O(19) bond length is 3.22 Å. The K(1)-O(8) bond length is 2.64 Å. There is one shorter (2.93 Å) and one longer (2.95 Å) K(1)-O(9) bond length. In the second K site, K(2) is bonded in a 6-coordinate geometry to one O(10), one O(15), one O(16), one O(7), and two equivalent O(8) atoms. The K(2)-O(10) bond length is 3.25 Å. The K(2)-O(15) bond length is 2.79 Å. The K(2)-O(16) bond length is 2.81 Å. The K(2)-O(7) bond length is 2.59 Å. There is one shorter (3.07 Å) and one longer (3.11 Å) K(2)-O(8) bond length. In the third K site, K(3) is bonded in a 8-coordinate geometry to one O(1), one O(12), one O(3), one O(4), one O(5), one O(6), and two equivalent O(11) atoms. The K(3)-O(1) bond length is 2.75 Å. The K(3)-O(12) bond length is 2.91 Å. The K(3)-O(3) bond length is 3.03 Å. The K(3)-O(4) bond length is 3.09 Å. The K(3)-O(5) bond length is 3.15 Å. The K(3)-O(6) bond length is 3.18 Å. There is one shorter (2.81 Å) and one longer (2.83 Å) K(3)-O(11) bond length. In the fourth K site, K(4) is bonded in a 9-coordinate geometry to one O(11), one O(19), one O(2), one O(3), one O(4), one O(5), one O(6), and two equivalent O(12) atoms. The K(4)-O(11) bond length is 2.97 Å. The K(4)-O(19) bond length is 3.36 Å. The K(4)-O(2) bond length is 2.69 Å. The K(4)-O(3) bond length is 2.99 Å. The K(4)-O(4) bond length is 3.01 Å. The K(4)-O(5) bond length is 3.22 Å. The K(4)-O(6) bond length is 3.25 Å. There is one shorter (2.85 Å) and one longer (2.86 Å) K(4)-O(12) bond length. In the fifth K site, K(5) is bonded in a 6-coordinate geometry to one O(11), one O(13), one O(14), one O(17), and two equivalent O(1) atoms. The K(5)-O(11) bond length is 2.75 Å. The K(5)-O(13) bond length is 2.90 Å. The K(5)-O(14) bond length is 2.88 Å. The K(5)-O(17) bond length is 3.01 Å. There is one shorter (2.81 Å) and one longer (2.83 Å) K(5)-O(1) bond length. In the sixth K site, K(6) is bonded in a 7-coordinate geometry to one O(12), one O(15), one O(16), one O(17), one O(18), and two equivalent O(2) atoms. The K(6)-O(12) bond length is 2.87 Å. The K(6)-O(15) bond length is 2.81 Å. The K(6)-O(16) bond length is 2.79 Å. The K(6)-O(17) bond length is 2.95 Å. The K(6)-O(18) bond length is 3.32 Å. There is one shorter (2.83 Å) and one longer (2.90 Å) K(6)-O(2) bond length. There are eight inequivalent As sites. In the first As site, As(1) is bonded in a trigonal non-coplanar geometry to one O(3), one O(4), and one O(9) atom. The As(1)-O(3) bond length is 1.84 Å. The As(1)-O(4) bond length is 1.84 Å. The As(1)-O(9) bond length is 1.70 Å. In the second As site, As(2) is bonded in a distorted T-shaped geometry to one O(10), one O(5), and one O(6) atom. The As(2)-O(10) bond length is 2.06 Å. The As(2)-O(5) bond length is 1.78 Å. The As(2)-O(6) bond length is 1.79 Å. In the third As site, As(3) is bonded in a distorted T-shaped geometry to one O(1), one O(13), and one O(14) atom. The As(3)-O(1) bond length is 1.72 Å. The As(3)-O(13) bond length is 1.87 Å. The As(3)-O(14) bond length is 1.87 Å. In the fourth As site, As(4) is bonded in a distorted T-shaped geometry to one O(15), one O(16), and one O(2) atom. The As(4)-O(15) bond length is 1.87 Å. The As(4)-O(16) bond length is 1.87 Å. The As(4)-O(2) bond length is 1.71 Å. In the fifth As site, As(5) is bonded in a distorted T-shaped geometry to one O(11), one O(3), and one O(4) atom. The As(5)-O(11) bond length is 1.72 Å. The As(5)-O(3) bond length is 1.88 Å. The As(5)-O(4) bond length is 1.88 Å. In the sixth As site, As(6) is bonded in a distorted T-shaped geometry to one O(12), one O(5), and one O(6) atom. The As(6)-O(12) bond length is 1.70 Å. The As(6)-O(5) bond length is 1.91 Å. The As(6)-O(6) bond length is 1.90 Å. In the seventh As site, As(7) is bonded in a distorted trigonal non-coplanar geometry to one O(13), one O(14), and one O(7) atom. The As(7)-O(13) bond length is 1.87 Å. The As(7)-O(14) bond length is 1.87 Å. The As(7)-O(7) bond length is 1.70 Å. In the eighth As site, As(8) is bonded in a distorted T-shaped geometry to one O(15), one O(16), and one O(8) atom. The As(8)-O(15) bond length is 1.86 Å. The As(8)-O(16) bond length is 1.86 Å. The As(8)-O(8) bond length is 1.71 Å. There are nineteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(5), and one As(3) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(4), two equivalent K(6), and one As(4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(1), and one As(5) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(1), and one As(5) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(2), and one As(6) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(3), one K(4), one As(2), and one As(6) atom. In the seventh O site, O(7) is bonded in a linear geometry to one K(2) and one As(7) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(2), and one As(8) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to two equivalent K(1) and one As(1) atom. In the tenth O site, O(10) is bonded in a 1-coordinate geometry to one K(2), one As(2), and one O(18) atom. The O(10)-O(18) bond length is 1.32 Å. In the eleventh O site, O(11) is bonded in a 5-coordinate geometry to one K(4), one K(5), two equivalent K(3), and one As(5) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one K(3), one K(6), two equivalent K(4), and one As(6) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one K(1), one K(5), one As(3), and one As(7) atom. In the fourteenth O site, O(14) is bonded in a distorted tetrahedral geometry to one K(1), one K(5), one As(3), and one As(7) atom. In the fifteenth O site, O(15) is bonded to one K(2), one K(6), one As(4), and one As(8) atom to form distorted edge-sharing OK2As2 tetrahedra. In the sixteenth O site, O(16) is bonded to one K(2), one K(6), one As(4), and one As(8) atom to form distorted edge-sharing OK2As2 tetrahedra. In the seventeenth O site, O(17) is bonded in a distorted trigonal non-coplanar geometry to one K(5), one K(6), and one O(19) atom. The O(17)-O(19) bond length is 1.26 Å. In the eighteenth O site, O(18) is bonded in a water-like geometry to one K(6) and one O(10) atom. In the nineteenth O site, O(19) is bonded in a 2-coordinate geometry to one K(1), one K(4), and one O(17) atom.