K3Ta2AsS11 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one S(10), one S(2), one S(5), one S(7), one S(9), and two equivalent S(11) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one As(1), one S(2), one S(3), one S(4), one S(9), and two equivalent S(8) atoms. In the third K site, K(3) is bonded in a 9-coordinate geometry to one S(1), one S(10), one S(4), one S(5), one S(7), two equivalent S(8), and two equivalent S(9) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(11), one S(3), one S(4), one S(7), and one S(8) atom. In the second Ta site, Ta(2) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(2), one S(3), one S(5), one S(6), and one S(9) atom. As(1) is bonded in a 3-coordinate geometry to one K(2), one S(11), one S(2), and one S(6) atom. There are eleven inequivalent S sites. In the first S site, S(5) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Ta(2), and one S(10) atom. In the second S site, S(6) is bonded in an L-shaped geometry to one Ta(2) and one As(1) atom. In the third S site, S(7) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Ta(1), and one S(1) atom. In the fourth S site, S(8) is bonded in a 5-coordinate geometry to two equivalent K(2), two equivalent K(3), and one Ta(1) atom. In the fifth S site, S(9) is bonded in a distorted single-bond geometry to one K(1), one K(2), two equivalent K(3), and one Ta(2) atom. In the sixth S site, S(10) is bonded in a 5-coordinate geometry to one K(1), one K(3), one Ta(1), one Ta(2), and one S(5) atom. In the seventh S site, S(11) is bonded in a 4-coordinate geometry to two equivalent K(1), one Ta(1), and one As(1) atom. In the eighth S site, S(1) is bonded in a 4-coordinate geometry to one K(3), one Ta(1), one Ta(2), and one S(7) atom. In the ninth S site, S(2) is bonded in a distorted L-shaped geometry to one K(1), one K(2), one Ta(2), and one As(1) atom. In the tenth S site, S(3) is bonded in a 4-coordinate geometry to one K(2), one Ta(1), one Ta(2), and one S(4) atom. In the eleventh S site, S(4) is bonded in a 4-coordinate geometry to one K(2), one K(3), one Ta(1), and one S(3) atom.
K3Ta2AsS11 crystallizes in the monoclinic Cc space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one S(10), one S(2), one S(5), one S(7), one S(9), and two equivalent S(11) atoms. The K(1)-S(10) bond length is 3.59 Å. The K(1)-S(2) bond length is 3.57 Å. The K(1)-S(5) bond length is 3.50 Å. The K(1)-S(7) bond length is 3.46 Å. The K(1)-S(9) bond length is 3.46 Å. There is one shorter (3.31 Å) and one longer (3.45 Å) K(1)-S(11) bond length. In the second K site, K(2) is bonded in a 7-coordinate geometry to one As(1), one S(2), one S(3), one S(4), one S(9), and two equivalent S(8) atoms. The K(2)-As(1) bond length is 3.48 Å. The K(2)-S(2) bond length is 3.64 Å. The K(2)-S(3) bond length is 3.69 Å. The K(2)-S(4) bond length is 3.27 Å. The K(2)-S(9) bond length is 3.35 Å. There is one shorter (3.19 Å) and one longer (3.38 Å) K(2)-S(8) bond length. In the third K site, K(3) is bonded in a 9-coordinate geometry to one S(1), one S(10), one S(4), one S(5), one S(7), two equivalent S(8), and two equivalent S(9) atoms. The K(3)-S(1) bond length is 3.47 Å. The K(3)-S(10) bond length is 3.44 Å. The K(3)-S(4) bond length is 3.39 Å. The K(3)-S(5) bond length is 3.28 Å. The K(3)-S(7) bond length is 3.39 Å. There is one shorter (3.34 Å) and one longer (3.47 Å) K(3)-S(8) bond length. There is one shorter (3.46 Å) and one longer (3.50 Å) K(3)-S(9) bond length. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(11), one S(3), one S(4), one S(7), and one S(8) atom. The Ta(1)-S(1) bond length is 2.48 Å. The Ta(1)-S(10) bond length is 2.80 Å. The Ta(1)-S(11) bond length is 2.51 Å. The Ta(1)-S(3) bond length is 2.52 Å. The Ta(1)-S(4) bond length is 2.49 Å. The Ta(1)-S(7) bond length is 2.46 Å. The Ta(1)-S(8) bond length is 2.24 Å. In the second Ta site, Ta(2) is bonded in a 7-coordinate geometry to one S(1), one S(10), one S(2), one S(3), one S(5), one S(6), and one S(9) atom. The Ta(2)-S(1) bond length is 2.87 Å. The Ta(2)-S(10) bond length is 2.47 Å. The Ta(2)-S(2) bond length is 2.55 Å. The Ta(2)-S(3) bond length is 2.65 Å. The Ta(2)-S(5) bond length is 2.46 Å. The Ta(2)-S(6) bond length is 2.49 Å. The Ta(2)-S(9) bond length is 2.24 Å. As(1) is bonded in a 3-coordinate geometry to one K(2), one S(11), one S(2), and one S(6) atom. The As(1)-S(11) bond length is 2.29 Å. The As(1)-S(2) bond length is 2.31 Å. The As(1)-S(6) bond length is 2.26 Å. There are eleven inequivalent S sites. In the first S site, S(5) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Ta(2), and one S(10) atom. The S(5)-S(10) bond length is 2.07 Å. In the second S site, S(6) is bonded in an L-shaped geometry to one Ta(2) and one As(1) atom. In the third S site, S(7) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Ta(1), and one S(1) atom. The S(7)-S(1) bond length is 2.09 Å. In the fourth S site, S(8) is bonded in a 5-coordinate geometry to two equivalent K(2), two equivalent K(3), and one Ta(1) atom. In the fifth S site, S(9) is bonded in a distorted single-bond geometry to one K(1), one K(2), two equivalent K(3), and one Ta(2) atom. In the sixth S site, S(10) is bonded in a 5-coordinate geometry to one K(1), one K(3), one Ta(1), one Ta(2), and one S(5) atom. In the seventh S site, S(11) is bonded in a 4-coordinate geometry to two equivalent K(1), one Ta(1), and one As(1) atom. In the eighth S site, S(1) is bonded in a 4-coordinate geometry to one K(3), one Ta(1), one Ta(2), and one S(7) atom. In the ninth S site, S(2) is bonded in a distorted L-shaped geometry to one K(1), one K(2), one Ta(2), and one As(1) atom. In the tenth S site, S(3) is bonded in a 4-coordinate geometry to one K(2), one Ta(1), one Ta(2), and one S(4) atom. The S(3)-S(4) bond length is 2.09 Å. In the eleventh S site, S(4) is bonded in a 4-coordinate geometry to one K(2), one K(3), one Ta(1), and one S(3) atom.