K2Ta3Cl9 crystallizes in the monoclinic C2/m space group. K(1) is bonded in a 6-coordinate geometry to one Cl(1), one Cl(3), one Cl(4), and three equivalent Cl(2) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one Cl(3), two equivalent Cl(4), and two equivalent Cl(6) atoms to form distorted corner-sharing TaCl5 square pyramids. In the second Ta site, Ta(2) is bonded to one Cl(1), one Cl(2), one Cl(4), one Cl(5), and one Cl(6) atom to form distorted corner-sharing TaCl5 square pyramids. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Ta(2) atoms. In the second Cl site, Cl(2) is bonded to three equivalent K(1) and one Ta(2) atom to form a mixture of corner and edge-sharing ClK3Ta tetrahedra. In the third Cl site, Cl(3) is bonded in a trigonal planar geometry to two equivalent K(1) and one Ta(1) atom. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one K(1), one Ta(1), and one Ta(2) atom. In the fifth Cl site, Cl(5) is bonded in a 2-coordinate geometry to two equivalent Ta(2) atoms. In the sixth Cl site, Cl(6) is bonded in a 2-coordinate geometry to one Ta(1) and one Ta(2) atom.
K2Ta3Cl9 crystallizes in the monoclinic C2/m space group. K(1) is bonded in a 6-coordinate geometry to one Cl(1), one Cl(3), one Cl(4), and three equivalent Cl(2) atoms. The K(1)-Cl(1) bond length is 3.59 Å. The K(1)-Cl(3) bond length is 3.03 Å. The K(1)-Cl(4) bond length is 3.38 Å. There are a spread of K(1)-Cl(2) bond distances ranging from 3.10-3.15 Å. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to one Cl(3), two equivalent Cl(4), and two equivalent Cl(6) atoms to form distorted corner-sharing TaCl5 square pyramids. The Ta(1)-Cl(3) bond length is 2.58 Å. Both Ta(1)-Cl(4) bond lengths are 2.48 Å. Both Ta(1)-Cl(6) bond lengths are 2.47 Å. In the second Ta site, Ta(2) is bonded to one Cl(1), one Cl(2), one Cl(4), one Cl(5), and one Cl(6) atom to form distorted corner-sharing TaCl5 square pyramids. The Ta(2)-Cl(1) bond length is 2.48 Å. The Ta(2)-Cl(2) bond length is 2.63 Å. The Ta(2)-Cl(4) bond length is 2.48 Å. The Ta(2)-Cl(5) bond length is 2.48 Å. The Ta(2)-Cl(6) bond length is 2.46 Å. There are six inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a 2-coordinate geometry to two equivalent K(1) and two equivalent Ta(2) atoms. In the second Cl site, Cl(2) is bonded to three equivalent K(1) and one Ta(2) atom to form a mixture of corner and edge-sharing ClK3Ta tetrahedra. In the third Cl site, Cl(3) is bonded in a trigonal planar geometry to two equivalent K(1) and one Ta(1) atom. In the fourth Cl site, Cl(4) is bonded in a 3-coordinate geometry to one K(1), one Ta(1), and one Ta(2) atom. In the fifth Cl site, Cl(5) is bonded in a 2-coordinate geometry to two equivalent Ta(2) atoms. In the sixth Cl site, Cl(6) is bonded in a 2-coordinate geometry to one Ta(1) and one Ta(2) atom.