The crystal structure described by As8S9 crystallizes in the triclinic P1 space group. There are twenty-four inequivalent As sites. In the first As site, As(1) is bonded in a distorted T-shaped geometry to one S(14), one S(2), and one S(26) atom. In the second As site, As(2) is bonded in a distorted L-shaped geometry to one S(23) and one S(25) atom. In the third As site, As(3) is bonded in a distorted L-shaped geometry to one As(23), one S(13), and one S(4) atom. In the fourth As site, As(4) is bonded in a single-bond geometry to one As(16) atom. In the fifth As site, As(5) is bonded in a distorted water-like geometry to one S(5) and one S(6) atom. In the sixth As site, As(6) is bonded in an L-shaped geometry to one As(14) and one As(22) atom. In the seventh As site, As(7) is bonded in a distorted water-like geometry to one As(23), one S(13), and one S(20) atom. In the eighth As site, As(8) is bonded in a distorted L-shaped geometry to one S(2) and one S(9) atom. In the ninth As site, As(9) is bonded in a distorted water-like geometry to one As(21), one S(11), one S(12), and one S(3) atom. In the tenth As site, As(10) is bonded in a distorted water-like geometry to one As(23), one S(27), and one S(7) atom. In the eleventh As site, As(11) is bonded in a distorted single-bond geometry to one As(18), one As(20), and one S(15) atom. In the twelfth As site, As(12) is bonded in a water-like geometry to one S(19) and one S(6) atom. In the thirteenth As site, As(13) is bonded in a distorted L-shaped geometry to one As(15), one S(17), and one S(24) atom. In the fourteenth As site, As(14) is bonded in a 2-coordinate geometry to one As(6), one S(18), and one S(5) atom. In the fifteenth As site, As(15) is bonded in a distorted single-bond geometry to one As(13), one As(22), one S(12), and one S(23) atom. In the sixteenth As site, As(16) is bonded in a distorted water-like geometry to one As(4) and one S(16) atom. In the seventeenth As site, As(17) is bonded in a distorted single-bond geometry to one As(21), one As(23), and one S(22) atom. In the eighteenth As site, As(18) is bonded in a distorted see-saw-like geometry to one As(11), one S(14), one S(16), and one S(9) atom. In the nineteenth As site, As(19) is bonded in a trigonal non-coplanar geometry to one S(1), one S(22), and one S(8) atom. In the twentieth As site, As(20) is bonded in a 3-coordinate geometry to one As(11), one S(16), and one S(8) atom. In the twenty-first As site, As(21) is bonded in a 3-coordinate geometry to one As(17), one As(9), and one S(3) atom. In the twenty-second As site, As(22) is bonded in a distorted single-bond geometry to one As(15), one As(6), and one S(10) atom. In the twenty-third As site, As(23) is bonded in a distorted see-saw-like geometry to one As(10), one As(17), one As(3), and one As(7) atom. In the twenty-fourth As site, As(24) is bonded in a distorted single-bond geometry to one S(25) atom. There are twenty-seven inequivalent S sites. In the first S site, S(1) is bonded in a single-bond geometry to one As(19) atom. In the second S site, S(2) is bonded in a 3-coordinate geometry to one As(1), one As(8), and one S(26) atom. In the third S site, S(3) is bonded in a 2-coordinate geometry to one As(21) and one As(9) atom. In the fourth S site, S(4) is bonded in a distorted water-like geometry to one As(3) and one S(21) atom. In the fifth S site, S(5) is bonded in a bent 120 degrees geometry to one As(14) and one As(5) atom. In the sixth S site, S(6) is bonded in a 2-coordinate geometry to one As(12) and one As(5) atom. In the seventh S site, S(7) is bonded in an L-shaped geometry to one As(10) and one S(8) atom. In the eighth S site, S(8) is bonded in a trigonal non-coplanar geometry to one As(19), one As(20), and one S(7) atom. In the ninth S site, S(9) is bonded in a water-like geometry to one As(18) and one As(8) atom. In the tenth S site, S(10) is bonded in a water-like geometry to one As(22) and one S(12) atom. In the eleventh S site, S(11) is bonded in a distorted L-shaped geometry to one As(9) and one S(17) atom. In the twelfth S site, S(12) is bonded in a 3-coordinate geometry to one As(15), one As(9), and one S(10) atom. In the thirteenth S site, S(13) is bonded in a water-like geometry to one As(3) and one As(7) atom. In the fourteenth S site, S(14) is bonded in a distorted water-like geometry to one As(1) and one As(18) atom. In the fifteenth S site, S(15) is bonded in a distorted water-like geometry to one As(11) and one S(18) atom. In the sixteenth S site, S(16) is bonded in a distorted L-shaped geometry to one As(16), one As(18), and one As(20) atom. In the seventeenth S site, S(17) is bonded in a water-like geometry to one As(13) and one S(11) atom. In the eighteenth S site, S(18) is bonded in a water-like geometry to one As(14) and one S(15) atom. In the nineteenth S site, S(19) is bonded in a water-like geometry to one As(12) and one S(24) atom. In the twentieth S site, S(20) is bonded in a water-like geometry to one As(7) and one S(21) atom. In the twenty-first S site, S(21) is bonded in a water-like geometry to one S(20) and one S(4) atom. In the twenty-second S site, S(22) is bonded in a water-like geometry to one As(17) and one As(19) atom. In the twenty-third S site, S(23) is bonded in an L-shaped geometry to one As(15) and one As(2) atom. In the twenty-fourth S site, S(24) is bonded in a water-like geometry to one As(13) and one S(19) atom. In the twenty-fifth S site, S(25) is bonded in a 2-coordinate geometry to one As(2) and one As(24) atom. In the twenty-sixth S site, S(26) is bonded in a 2-coordinate geometry to one As(1) and one S(2) atom. In the twenty-seventh S site, S(27) is bonded in a single-bond geometry to one As(10) atom. is represented by the CIF file [CIF]
data_As8S9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.604
_cell_length_b   9.907
_cell_length_c   22.225
_cell_angle_alpha   95.257
_cell_angle_beta   95.230
_cell_angle_gamma   99.798
_symmetry_Int_Tables_number   1
_cell_volume   1847.975
_cell_formula_units_Z   3
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
  As  As0  1  0.124  0.378  0.038  1.0
  As  As1  1  0.989  0.506  0.353  1.0
  As  As2  1  0.390  0.206  0.686  1.0
  As  As3  1  0.926  0.263  0.848  1.0
  As  As4  1  0.088  0.869  0.169  1.0
  As  As5  1  0.394  0.168  0.343  1.0
  As  As6  1  0.640  0.990  0.629  1.0
  As  As7  1  0.402  0.650  0.988  1.0
  As  As8  1  0.332  0.727  0.565  1.0
  As  As9  1  0.689  0.839  0.772  1.0
  As  As10  1  0.354  0.157  0.033  1.0
  As  As11  1  0.914  0.753  0.243  1.0
  As  As12  1  0.598  0.750  0.387  1.0
  As  As13  1  0.274  0.236  0.252  1.0
  As  As14  1  0.661  0.524  0.419  1.0
  As  As15  1  0.952  0.127  0.917  1.0
  As  As16  1  0.232  0.799  0.715  1.0
  As  As17  1  0.552  0.380  0.055  1.0
  As  As18  1  0.191  0.923  0.871  1.0
  As  As19  1  0.578  0.030  0.005  1.0
  As  As20  1  0.102  0.814  0.609  1.0
  As  As21  1  0.381  0.403  0.379  1.0
  As  As22  1  0.476  0.978  0.717  1.0
  As  As23  1  0.019  0.356  0.259  1.0
  S  S24  1  0.103  0.707  0.863  1.0
  S  S25  1  0.155  0.512  0.951  1.0
  S  S26  1  0.104  0.586  0.575  1.0
  S  S27  1  0.160  0.144  0.619  1.0
  S  S28  1  0.082  0.100  0.186  1.0
  S  S29  1  0.186  0.798  0.255  1.0
  S  S30  1  0.526  0.752  0.848  1.0
  S  S31  1  0.492  0.940  0.884  1.0
  S  S32  1  0.544  0.488  0.966  1.0
  S  S33  1  0.332  0.359  0.477  1.0
  S  S34  1  0.304  0.806  0.470  1.0
  S  S35  1  0.500  0.495  0.528  1.0
  S  S36  1  0.527  0.176  0.604  1.0
  S  S37  1  0.342  0.497  0.094  1.0
  S  S38  1  0.441  0.091  0.128  1.0
  S  S39  1  0.745  0.222  0.007  1.0
  S  S40  1  0.540  0.886  0.469  1.0
  S  S41  1  0.495  0.253  0.192  1.0
  S  S42  1  0.843  0.933  0.301  1.0
  S  S43  1  0.845  0.106  0.702  1.0
  S  S44  1  0.988  0.239  0.655  1.0
  S  S45  1  0.153  0.976  0.771  1.0
  S  S46  1  0.733  0.520  0.319  1.0
  S  S47  1  0.852  0.872  0.388  1.0
  S  S48  1  0.951  0.269  0.343  1.0
  S  S49  1  0.001  0.560  0.012  1.0
  S  S50  1  0.631  0.692  0.695  1.0
[/CIF]
.
The crystal structure described by As8S9 crystallizes in the triclinic P1 space group. There are twenty-four inequivalent As sites. In the first As site, As(1) is bonded in a distorted T-shaped geometry to one S(14), one S(2), and one S(26) atom. In the second As site, As(2) is bonded in a distorted L-shaped geometry to one S(23) and one S(25) atom. In the third As site, As(3) is bonded in a distorted L-shaped geometry to one As(23), one S(13), and one S(4) atom. In the fourth As site, As(4) is bonded in a single-bond geometry to one As(16) atom. In the fifth As site, As(5) is bonded in a distorted water-like geometry to one S(5) and one S(6) atom. In the sixth As site, As(6) is bonded in an L-shaped geometry to one As(14) and one As(22) atom. In the seventh As site, As(7) is bonded in a distorted water-like geometry to one As(23), one S(13), and one S(20) atom. In the eighth As site, As(8) is bonded in a distorted L-shaped geometry to one S(2) and one S(9) atom. In the ninth As site, As(9) is bonded in a distorted water-like geometry to one As(21), one S(11), one S(12), and one S(3) atom. In the tenth As site, As(10) is bonded in a distorted water-like geometry to one As(23), one S(27), and one S(7) atom. In the eleventh As site, As(11) is bonded in a distorted single-bond geometry to one As(18), one As(20), and one S(15) atom. In the twelfth As site, As(12) is bonded in a water-like geometry to one S(19) and one S(6) atom. In the thirteenth As site, As(13) is bonded in a distorted L-shaped geometry to one As(15), one S(17), and one S(24) atom. In the fourteenth As site, As(14) is bonded in a 2-coordinate geometry to one As(6), one S(18), and one S(5) atom. In the fifteenth As site, As(15) is bonded in a distorted single-bond geometry to one As(13), one As(22), one S(12), and one S(23) atom. In the sixteenth As site, As(16) is bonded in a distorted water-like geometry to one As(4) and one S(16) atom. In the seventeenth As site, As(17) is bonded in a distorted single-bond geometry to one As(21), one As(23), and one S(22) atom. In the eighteenth As site, As(18) is bonded in a distorted see-saw-like geometry to one As(11), one S(14), one S(16), and one S(9) atom. In the nineteenth As site, As(19) is bonded in a trigonal non-coplanar geometry to one S(1), one S(22), and one S(8) atom. In the twentieth As site, As(20) is bonded in a 3-coordinate geometry to one As(11), one S(16), and one S(8) atom. In the twenty-first As site, As(21) is bonded in a 3-coordinate geometry to one As(17), one As(9), and one S(3) atom. In the twenty-second As site, As(22) is bonded in a distorted single-bond geometry to one As(15), one As(6), and one S(10) atom. In the twenty-third As site, As(23) is bonded in a distorted see-saw-like geometry to one As(10), one As(17), one As(3), and one As(7) atom. In the twenty-fourth As site, As(24) is bonded in a distorted single-bond geometry to one S(25) atom. There are twenty-seven inequivalent S sites. In the first S site, S(1) is bonded in a single-bond geometry to one As(19) atom. In the second S site, S(2) is bonded in a 3-coordinate geometry to one As(1), one As(8), and one S(26) atom. In the third S site, S(3) is bonded in a 2-coordinate geometry to one As(21) and one As(9) atom. In the fourth S site, S(4) is bonded in a distorted water-like geometry to one As(3) and one S(21) atom. In the fifth S site, S(5) is bonded in a bent 120 degrees geometry to one As(14) and one As(5) atom. In the sixth S site, S(6) is bonded in a 2-coordinate geometry to one As(12) and one As(5) atom. In the seventh S site, S(7) is bonded in an L-shaped geometry to one As(10) and one S(8) atom. In the eighth S site, S(8) is bonded in a trigonal non-coplanar geometry to one As(19), one As(20), and one S(7) atom. In the ninth S site, S(9) is bonded in a water-like geometry to one As(18) and one As(8) atom. In the tenth S site, S(10) is bonded in a water-like geometry to one As(22) and one S(12) atom. In the eleventh S site, S(11) is bonded in a distorted L-shaped geometry to one As(9) and one S(17) atom. In the twelfth S site, S(12) is bonded in a 3-coordinate geometry to one As(15), one As(9), and one S(10) atom. In the thirteenth S site, S(13) is bonded in a water-like geometry to one As(3) and one As(7) atom. In the fourteenth S site, S(14) is bonded in a distorted water-like geometry to one As(1) and one As(18) atom. In the fifteenth S site, S(15) is bonded in a distorted water-like geometry to one As(11) and one S(18) atom. In the sixteenth S site, S(16) is bonded in a distorted L-shaped geometry to one As(16), one As(18), and one As(20) atom. In the seventeenth S site, S(17) is bonded in a water-like geometry to one As(13) and one S(11) atom. In the eighteenth S site, S(18) is bonded in a water-like geometry to one As(14) and one S(15) atom. In the nineteenth S site, S(19) is bonded in a water-like geometry to one As(12) and one S(24) atom. In the twentieth S site, S(20) is bonded in a water-like geometry to one As(7) and one S(21) atom. In the twenty-first S site, S(21) is bonded in a water-like geometry to one S(20) and one S(4) atom. In the twenty-second S site, S(22) is bonded in a water-like geometry to one As(17) and one As(19) atom. In the twenty-third S site, S(23) is bonded in an L-shaped geometry to one As(15) and one As(2) atom. In the twenty-fourth S site, S(24) is bonded in a water-like geometry to one As(13) and one S(19) atom. In the twenty-fifth S site, S(25) is bonded in a 2-coordinate geometry to one As(2) and one As(24) atom. In the twenty-sixth S site, S(26) is bonded in a 2-coordinate geometry to one As(1) and one S(2) atom. In the twenty-seventh S site, S(27) is bonded in a single-bond geometry to one As(10) atom. is represented by the CIF file [CIF]
data_As8S9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.604
_cell_length_b   9.907
_cell_length_c   22.225
_cell_angle_alpha   95.257
_cell_angle_beta   95.230
_cell_angle_gamma   99.798
_symmetry_Int_Tables_number   1
_cell_volume   1847.975
_cell_formula_units_Z   3
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
  As  As0  1  0.124  0.378  0.038  1.0
  As  As1  1  0.989  0.506  0.353  1.0
  As  As2  1  0.390  0.206  0.686  1.0
  As  As3  1  0.926  0.263  0.848  1.0
  As  As4  1  0.088  0.869  0.169  1.0
  As  As5  1  0.394  0.168  0.343  1.0
  As  As6  1  0.640  0.990  0.629  1.0
  As  As7  1  0.402  0.650  0.988  1.0
  As  As8  1  0.332  0.727  0.565  1.0
  As  As9  1  0.689  0.839  0.772  1.0
  As  As10  1  0.354  0.157  0.033  1.0
  As  As11  1  0.914  0.753  0.243  1.0
  As  As12  1  0.598  0.750  0.387  1.0
  As  As13  1  0.274  0.236  0.252  1.0
  As  As14  1  0.661  0.524  0.419  1.0
  As  As15  1  0.952  0.127  0.917  1.0
  As  As16  1  0.232  0.799  0.715  1.0
  As  As17  1  0.552  0.380  0.055  1.0
  As  As18  1  0.191  0.923  0.871  1.0
  As  As19  1  0.578  0.030  0.005  1.0
  As  As20  1  0.102  0.814  0.609  1.0
  As  As21  1  0.381  0.403  0.379  1.0
  As  As22  1  0.476  0.978  0.717  1.0
  As  As23  1  0.019  0.356  0.259  1.0
  S  S24  1  0.103  0.707  0.863  1.0
  S  S25  1  0.155  0.512  0.951  1.0
  S  S26  1  0.104  0.586  0.575  1.0
  S  S27  1  0.160  0.144  0.619  1.0
  S  S28  1  0.082  0.100  0.186  1.0
  S  S29  1  0.186  0.798  0.255  1.0
  S  S30  1  0.526  0.752  0.848  1.0
  S  S31  1  0.492  0.940  0.884  1.0
  S  S32  1  0.544  0.488  0.966  1.0
  S  S33  1  0.332  0.359  0.477  1.0
  S  S34  1  0.304  0.806  0.470  1.0
  S  S35  1  0.500  0.495  0.528  1.0
  S  S36  1  0.527  0.176  0.604  1.0
  S  S37  1  0.342  0.497  0.094  1.0
  S  S38  1  0.441  0.091  0.128  1.0
  S  S39  1  0.745  0.222  0.007  1.0
  S  S40  1  0.540  0.886  0.469  1.0
  S  S41  1  0.495  0.253  0.192  1.0
  S  S42  1  0.843  0.933  0.301  1.0
  S  S43  1  0.845  0.106  0.702  1.0
  S  S44  1  0.988  0.239  0.655  1.0
  S  S45  1  0.153  0.976  0.771  1.0
  S  S46  1  0.733  0.520  0.319  1.0
  S  S47  1  0.852  0.872  0.388  1.0
  S  S48  1  0.951  0.269  0.343  1.0
  S  S49  1  0.001  0.560  0.012  1.0
  S  S50  1  0.631  0.692  0.695  1.0
[/CIF]
.