Ta9(CoS3)2 crystallizes in the hexagonal P-62m space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent Co(1), one S(2), and two equivalent S(1) atoms to form a mixture of distorted corner and edge-sharing TaCo2S3 trigonal bipyramids. In the second Ta site, Ta(2) is bonded in a 5-coordinate geometry to two equivalent Co(1), one S(3), and two equivalent S(1) atoms. In the third Ta site, Ta(3) is bonded in a 3-coordinate geometry to one S(1), one S(2), and one S(3) atom. Co(1) is bonded in a 6-coordinate geometry to three equivalent Ta(1) and three equivalent Ta(2) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a distorted pentagonal planar geometry to one Ta(3), two equivalent Ta(1), and two equivalent Ta(2) atoms. In the second S site, S(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ta(1) and two equivalent Ta(3) atoms. In the third S site, S(3) is bonded in a 4-coordinate geometry to two equivalent Ta(2) and two equivalent Ta(3) atoms.
Ta9(CoS3)2 crystallizes in the hexagonal P-62m space group. There are three inequivalent Ta sites. In the first Ta site, Ta(1) is bonded to two equivalent Co(1), one S(2), and two equivalent S(1) atoms to form a mixture of distorted corner and edge-sharing TaCo2S3 trigonal bipyramids. Both Ta(1)-Co(1) bond lengths are 2.42 Å. The Ta(1)-S(2) bond length is 2.38 Å. Both Ta(1)-S(1) bond lengths are 2.51 Å. In the second Ta site, Ta(2) is bonded in a 5-coordinate geometry to two equivalent Co(1), one S(3), and two equivalent S(1) atoms. Both Ta(2)-Co(1) bond lengths are 2.54 Å. The Ta(2)-S(3) bond length is 2.42 Å. Both Ta(2)-S(1) bond lengths are 2.56 Å. In the third Ta site, Ta(3) is bonded in a 3-coordinate geometry to one S(1), one S(2), and one S(3) atom. The Ta(3)-S(1) bond length is 2.54 Å. The Ta(3)-S(2) bond length is 2.51 Å. The Ta(3)-S(3) bond length is 2.49 Å. Co(1) is bonded in a 6-coordinate geometry to three equivalent Ta(1) and three equivalent Ta(2) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a distorted pentagonal planar geometry to one Ta(3), two equivalent Ta(1), and two equivalent Ta(2) atoms. In the second S site, S(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Ta(1) and two equivalent Ta(3) atoms. In the third S site, S(3) is bonded in a 4-coordinate geometry to two equivalent Ta(2) and two equivalent Ta(3) atoms.