The material described by K4Ta2S11 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one S(10), one S(11), one S(2), one S(7), one S(8), and two equivalent S(5) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one S(11), one S(3), one S(6), one S(7), and one S(8) atom. In the third K site, K(3) is bonded in a 8-coordinate geometry to one S(1), one S(10), one S(11), one S(3), one S(6), one S(8), and two equivalent S(2) atoms. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one S(1), one S(2), one S(3), two equivalent S(4), two equivalent S(9), and three equivalent S(6) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to one S(11), one S(3), one S(4), one S(5), one S(7), one S(8), and one S(9) 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(4), one S(5), one S(6), and one S(9) atom. There are eleven inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to one K(3), one K(4), one Ta(2), and one S(6) atom. In the second S site, S(2) is bonded to one K(1), one K(4), two equivalent K(3), and one Ta(2) atom to form distorted SK4Ta square pyramids that share corners with three equivalent S(4)K2Ta2S square pyramids,  a cornercorner with one S(5)K2Ta2S trigonal bipyramid,  a cornercorner with one S(7)K2TaS trigonal pyramid,  an edgeedge with one S(2)K4Ta square pyramid, and  an edgeedge with one S(5)K2Ta2S trigonal bipyramid. In the third S site, S(3) is bonded in a 1-coordinate geometry to one K(2), one K(3), one K(4), and one Ta(1) atom. In the fourth S site, S(4) is bonded to two equivalent K(4), one Ta(1), one Ta(2), and one S(7) atom to form distorted SK2Ta2S square pyramids that share corners with three equivalent S(2)K4Ta square pyramids,  a cornercorner with one S(7)K2TaS trigonal pyramid,  an edgeedge with one S(4)K2Ta2S square pyramid, and  an edgeedge with one S(5)K2Ta2S trigonal bipyramid. In the fifth S site, S(5) is bonded to two equivalent K(1), one Ta(1), one Ta(2), and one S(10) atom to form distorted SK2Ta2S trigonal bipyramids that share  a cornercorner with one S(2)K4Ta square pyramid, corners with three equivalent S(7)K2TaS trigonal pyramids,  an edgeedge with one S(4)K2Ta2S square pyramid,  an edgeedge with one S(2)K4Ta square pyramid, and  an edgeedge with one S(5)K2Ta2S trigonal bipyramid. In the sixth S site, S(6) is bonded in a 7-coordinate geometry to one K(2), one K(3), three equivalent K(4), one Ta(2), and one S(1) atom. In the seventh S site, S(7) is bonded to one K(1), one K(2), one Ta(1), and one S(4) atom to form distorted SK2TaS trigonal pyramids that share  a cornercorner with one S(4)K2Ta2S square pyramid,  a cornercorner with one S(2)K4Ta square pyramid, and corners with three equivalent S(5)K2Ta2S trigonal bipyramids. In the eighth S site, S(8) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one Ta(1), and one S(11) atom. In the ninth S site, S(9) is bonded in a 4-coordinate geometry to two equivalent K(4), one Ta(1), and one Ta(2) atom. In the tenth S site, S(10) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Ta(2), and one S(5) atom. In the eleventh S site, S(11) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one Ta(1), and one S(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4Ta2S11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.475
_cell_length_b   11.547
_cell_length_c   11.775
_cell_angle_alpha   68.689
_cell_angle_beta   86.308
_cell_angle_gamma   85.158
_symmetry_Int_Tables_number   1
_cell_volume   942.868
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  K  K0  1  0.235  0.653  0.943  1.0
  K  K1  1  0.735  0.367  0.508  1.0
  K  K2  1  0.265  0.633  0.492  1.0
  K  K3  1  0.466  0.192  0.836  1.0
  K  K4  1  0.788  0.963  0.388  1.0
  K  K5  1  0.212  0.037  0.612  1.0
  K  K6  1  0.534  0.808  0.164  1.0
  K  K7  1  0.765  0.347  0.057  1.0
  Ta  Ta8  1  0.266  0.356  0.339  1.0
  Ta  Ta9  1  0.734  0.644  0.661  1.0
  Ta  Ta10  1  0.354  0.133  0.201  1.0
  Ta  Ta11  1  0.646  0.867  0.799  1.0
  S  S12  1  0.164  0.968  0.202  1.0
  S  S13  1  0.611  0.083  0.113  1.0
  S  S14  1  0.389  0.917  0.887  1.0
  S  S15  1  0.235  0.340  0.536  1.0
  S  S16  1  0.939  0.804  0.664  1.0
  S  S17  1  0.061  0.196  0.336  1.0
  S  S18  1  0.659  0.636  0.905  1.0
  S  S19  1  0.341  0.364  0.095  1.0
  S  S20  1  0.709  0.066  0.635  1.0
  S  S21  1  0.291  0.934  0.365  1.0
  S  S22  1  0.041  0.620  0.730  1.0
  S  S23  1  0.959  0.380  0.270  1.0
  S  S24  1  0.739  0.411  0.762  1.0
  S  S25  1  0.261  0.589  0.238  1.0
  S  S26  1  0.495  0.184  0.363  1.0
  S  S27  1  0.183  0.269  0.025  1.0
  S  S28  1  0.836  0.032  0.798  1.0
  S  S29  1  0.817  0.731  0.975  1.0
  S  S30  1  0.487  0.508  0.747  1.0
  S  S31  1  0.513  0.492  0.253  1.0
  S  S32  1  0.505  0.816  0.637  1.0
  S  S33  1  0.765  0.660  0.464  1.0
[/CIF]
.
The material described by K4Ta2S11 crystallizes in the triclinic P-1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one S(10), one S(11), one S(2), one S(7), one S(8), and two equivalent S(5) atoms. In the second K site, K(2) is bonded in a 5-coordinate geometry to one S(11), one S(3), one S(6), one S(7), and one S(8) atom. In the third K site, K(3) is bonded in a 8-coordinate geometry to one S(1), one S(10), one S(11), one S(3), one S(6), one S(8), and two equivalent S(2) atoms. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one S(1), one S(2), one S(3), two equivalent S(4), two equivalent S(9), and three equivalent S(6) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 7-coordinate geometry to one S(11), one S(3), one S(4), one S(5), one S(7), one S(8), and one S(9) 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(4), one S(5), one S(6), and one S(9) atom. There are eleven inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to one K(3), one K(4), one Ta(2), and one S(6) atom. In the second S site, S(2) is bonded to one K(1), one K(4), two equivalent K(3), and one Ta(2) atom to form distorted SK4Ta square pyramids that share corners with three equivalent S(4)K2Ta2S square pyramids,  a cornercorner with one S(5)K2Ta2S trigonal bipyramid,  a cornercorner with one S(7)K2TaS trigonal pyramid,  an edgeedge with one S(2)K4Ta square pyramid, and  an edgeedge with one S(5)K2Ta2S trigonal bipyramid. In the third S site, S(3) is bonded in a 1-coordinate geometry to one K(2), one K(3), one K(4), and one Ta(1) atom. In the fourth S site, S(4) is bonded to two equivalent K(4), one Ta(1), one Ta(2), and one S(7) atom to form distorted SK2Ta2S square pyramids that share corners with three equivalent S(2)K4Ta square pyramids,  a cornercorner with one S(7)K2TaS trigonal pyramid,  an edgeedge with one S(4)K2Ta2S square pyramid, and  an edgeedge with one S(5)K2Ta2S trigonal bipyramid. In the fifth S site, S(5) is bonded to two equivalent K(1), one Ta(1), one Ta(2), and one S(10) atom to form distorted SK2Ta2S trigonal bipyramids that share  a cornercorner with one S(2)K4Ta square pyramid, corners with three equivalent S(7)K2TaS trigonal pyramids,  an edgeedge with one S(4)K2Ta2S square pyramid,  an edgeedge with one S(2)K4Ta square pyramid, and  an edgeedge with one S(5)K2Ta2S trigonal bipyramid. In the sixth S site, S(6) is bonded in a 7-coordinate geometry to one K(2), one K(3), three equivalent K(4), one Ta(2), and one S(1) atom. In the seventh S site, S(7) is bonded to one K(1), one K(2), one Ta(1), and one S(4) atom to form distorted SK2TaS trigonal pyramids that share  a cornercorner with one S(4)K2Ta2S square pyramid,  a cornercorner with one S(2)K4Ta square pyramid, and corners with three equivalent S(5)K2Ta2S trigonal bipyramids. In the eighth S site, S(8) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one Ta(1), and one S(11) atom. In the ninth S site, S(9) is bonded in a 4-coordinate geometry to two equivalent K(4), one Ta(1), and one Ta(2) atom. In the tenth S site, S(10) is bonded in a 4-coordinate geometry to one K(1), one K(3), one Ta(2), and one S(5) atom. In the eleventh S site, S(11) is bonded in a 5-coordinate geometry to one K(1), one K(2), one K(3), one Ta(1), and one S(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K4Ta2S11
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.475
_cell_length_b   11.547
_cell_length_c   11.775
_cell_angle_alpha   68.689
_cell_angle_beta   86.308
_cell_angle_gamma   85.158
_symmetry_Int_Tables_number   1
_cell_volume   942.868
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  K  K0  1  0.235  0.653  0.943  1.0
  K  K1  1  0.735  0.367  0.508  1.0
  K  K2  1  0.265  0.633  0.492  1.0
  K  K3  1  0.466  0.192  0.836  1.0
  K  K4  1  0.788  0.963  0.388  1.0
  K  K5  1  0.212  0.037  0.612  1.0
  K  K6  1  0.534  0.808  0.164  1.0
  K  K7  1  0.765  0.347  0.057  1.0
  Ta  Ta8  1  0.266  0.356  0.339  1.0
  Ta  Ta9  1  0.734  0.644  0.661  1.0
  Ta  Ta10  1  0.354  0.133  0.201  1.0
  Ta  Ta11  1  0.646  0.867  0.799  1.0
  S  S12  1  0.164  0.968  0.202  1.0
  S  S13  1  0.611  0.083  0.113  1.0
  S  S14  1  0.389  0.917  0.887  1.0
  S  S15  1  0.235  0.340  0.536  1.0
  S  S16  1  0.939  0.804  0.664  1.0
  S  S17  1  0.061  0.196  0.336  1.0
  S  S18  1  0.659  0.636  0.905  1.0
  S  S19  1  0.341  0.364  0.095  1.0
  S  S20  1  0.709  0.066  0.635  1.0
  S  S21  1  0.291  0.934  0.365  1.0
  S  S22  1  0.041  0.620  0.730  1.0
  S  S23  1  0.959  0.380  0.270  1.0
  S  S24  1  0.739  0.411  0.762  1.0
  S  S25  1  0.261  0.589  0.238  1.0
  S  S26  1  0.495  0.184  0.363  1.0
  S  S27  1  0.183  0.269  0.025  1.0
  S  S28  1  0.836  0.032  0.798  1.0
  S  S29  1  0.817  0.731  0.975  1.0
  S  S30  1  0.487  0.508  0.747  1.0
  S  S31  1  0.513  0.492  0.253  1.0
  S  S32  1  0.505  0.816  0.637  1.0
  S  S33  1  0.765  0.660  0.464  1.0
[/CIF]
.