The material described by RbErS2O9 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. Er(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(2), one O(6), one O(7), and one O(8) atom. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and one Er(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Rb(1), one Er(1), and one S(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), one Er(1), and one S(1) atom. In the fourth O site, O(8) is bonded in a 2-coordinate geometry to one Rb(1), one Er(1), and one S(1) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1) and one S(2) atom. In the sixth O site, O(9) is bonded in a 3-coordinate geometry to one Rb(1), one Er(1), and one S(2) atom. In the seventh O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), one Er(1), and one S(1) atom. In the eighth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Er(1), and one S(2) atom. In the ninth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(1), one Er(1), and one S(2) atom. is represented by the CIF file [CIF]
data_RbErS2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.557
_cell_length_b   10.594
_cell_length_c   10.154
_cell_angle_alpha   120.176
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   795.754
_cell_formula_units_Z   4
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
  Rb  Rb0  1  0.332  0.683  0.964  1.0
  Rb  Rb1  1  0.668  0.317  0.036  1.0
  Rb  Rb2  1  0.832  0.817  0.536  1.0
  Rb  Rb3  1  0.168  0.183  0.464  1.0
  Er  Er4  1  0.369  0.968  0.718  1.0
  Er  Er5  1  0.631  0.032  0.282  1.0
  Er  Er6  1  0.869  0.532  0.782  1.0
  Er  Er7  1  0.131  0.468  0.218  1.0
  S  S8  1  0.132  0.316  0.876  1.0
  S  S9  1  0.868  0.684  0.124  1.0
  S  S10  1  0.632  0.184  0.624  1.0
  S  S11  1  0.368  0.816  0.376  1.0
  S  S12  1  0.197  0.609  0.598  1.0
  S  S13  1  0.803  0.391  0.402  1.0
  S  S14  1  0.697  0.891  0.902  1.0
  S  S15  1  0.303  0.109  0.098  1.0
  O  O16  1  0.791  0.026  0.971  1.0
  O  O17  1  0.209  0.974  0.029  1.0
  O  O18  1  0.291  0.474  0.529  1.0
  O  O19  1  0.709  0.526  0.471  1.0
  O  O20  1  0.206  0.176  0.764  1.0
  O  O21  1  0.794  0.824  0.236  1.0
  O  O22  1  0.706  0.324  0.736  1.0
  O  O23  1  0.294  0.676  0.264  1.0
  O  O24  1  0.301  0.740  0.680  1.0
  O  O25  1  0.699  0.260  0.320  1.0
  O  O26  1  0.801  0.760  0.820  1.0
  O  O27  1  0.199  0.240  0.180  1.0
  O  O28  1  0.392  0.120  0.978  1.0
  O  O29  1  0.608  0.880  0.022  1.0
  O  O30  1  0.892  0.380  0.522  1.0
  O  O31  1  0.108  0.620  0.478  1.0
  O  O32  1  0.116  0.939  0.778  1.0
  O  O33  1  0.884  0.061  0.222  1.0
  O  O34  1  0.616  0.561  0.722  1.0
  O  O35  1  0.384  0.439  0.278  1.0
  O  O36  1  0.252  0.420  0.986  1.0
  O  O37  1  0.748  0.580  0.014  1.0
  O  O38  1  0.752  0.080  0.514  1.0
  O  O39  1  0.248  0.920  0.486  1.0
  O  O40  1  0.013  0.300  0.973  1.0
  O  O41  1  0.987  0.700  0.027  1.0
  O  O42  1  0.513  0.200  0.527  1.0
  O  O43  1  0.487  0.800  0.473  1.0
  O  O44  1  0.060  0.381  0.789  1.0
  O  O45  1  0.940  0.619  0.211  1.0
  O  O46  1  0.560  0.119  0.711  1.0
  O  O47  1  0.440  0.881  0.289  1.0
  O  O48  1  0.590  0.888  0.786  1.0
  O  O49  1  0.410  0.112  0.214  1.0
  O  O50  1  0.090  0.612  0.714  1.0
  O  O51  1  0.910  0.388  0.286  1.0
[/CIF]
.
The material described by RbErS2O9 crystallizes in the monoclinic P2_1/c space group. Rb(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. Er(1) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(2), one O(6), one O(7), and one O(8) atom. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(4), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Rb(1) and one Er(1) atom. In the second O site, O(6) is bonded in a 3-coordinate geometry to one Rb(1), one Er(1), and one S(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Rb(1), one Er(1), and one S(1) atom. In the fourth O site, O(8) is bonded in a 2-coordinate geometry to one Rb(1), one Er(1), and one S(1) atom. In the fifth O site, O(1) is bonded in a distorted single-bond geometry to one Rb(1) and one S(2) atom. In the sixth O site, O(9) is bonded in a 3-coordinate geometry to one Rb(1), one Er(1), and one S(2) atom. In the seventh O site, O(2) is bonded in a distorted single-bond geometry to one Rb(1), one Er(1), and one S(1) atom. In the eighth O site, O(3) is bonded in a 2-coordinate geometry to one Rb(1), one Er(1), and one S(2) atom. In the ninth O site, O(4) is bonded in a 3-coordinate geometry to one Rb(1), one Er(1), and one S(2) atom. is represented by the CIF file [CIF]
data_RbErS2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.557
_cell_length_b   10.594
_cell_length_c   10.154
_cell_angle_alpha   120.176
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   795.754
_cell_formula_units_Z   4
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
  Rb  Rb0  1  0.332  0.683  0.964  1.0
  Rb  Rb1  1  0.668  0.317  0.036  1.0
  Rb  Rb2  1  0.832  0.817  0.536  1.0
  Rb  Rb3  1  0.168  0.183  0.464  1.0
  Er  Er4  1  0.369  0.968  0.718  1.0
  Er  Er5  1  0.631  0.032  0.282  1.0
  Er  Er6  1  0.869  0.532  0.782  1.0
  Er  Er7  1  0.131  0.468  0.218  1.0
  S  S8  1  0.132  0.316  0.876  1.0
  S  S9  1  0.868  0.684  0.124  1.0
  S  S10  1  0.632  0.184  0.624  1.0
  S  S11  1  0.368  0.816  0.376  1.0
  S  S12  1  0.197  0.609  0.598  1.0
  S  S13  1  0.803  0.391  0.402  1.0
  S  S14  1  0.697  0.891  0.902  1.0
  S  S15  1  0.303  0.109  0.098  1.0
  O  O16  1  0.791  0.026  0.971  1.0
  O  O17  1  0.209  0.974  0.029  1.0
  O  O18  1  0.291  0.474  0.529  1.0
  O  O19  1  0.709  0.526  0.471  1.0
  O  O20  1  0.206  0.176  0.764  1.0
  O  O21  1  0.794  0.824  0.236  1.0
  O  O22  1  0.706  0.324  0.736  1.0
  O  O23  1  0.294  0.676  0.264  1.0
  O  O24  1  0.301  0.740  0.680  1.0
  O  O25  1  0.699  0.260  0.320  1.0
  O  O26  1  0.801  0.760  0.820  1.0
  O  O27  1  0.199  0.240  0.180  1.0
  O  O28  1  0.392  0.120  0.978  1.0
  O  O29  1  0.608  0.880  0.022  1.0
  O  O30  1  0.892  0.380  0.522  1.0
  O  O31  1  0.108  0.620  0.478  1.0
  O  O32  1  0.116  0.939  0.778  1.0
  O  O33  1  0.884  0.061  0.222  1.0
  O  O34  1  0.616  0.561  0.722  1.0
  O  O35  1  0.384  0.439  0.278  1.0
  O  O36  1  0.252  0.420  0.986  1.0
  O  O37  1  0.748  0.580  0.014  1.0
  O  O38  1  0.752  0.080  0.514  1.0
  O  O39  1  0.248  0.920  0.486  1.0
  O  O40  1  0.013  0.300  0.973  1.0
  O  O41  1  0.987  0.700  0.027  1.0
  O  O42  1  0.513  0.200  0.527  1.0
  O  O43  1  0.487  0.800  0.473  1.0
  O  O44  1  0.060  0.381  0.789  1.0
  O  O45  1  0.940  0.619  0.211  1.0
  O  O46  1  0.560  0.119  0.711  1.0
  O  O47  1  0.440  0.881  0.289  1.0
  O  O48  1  0.590  0.888  0.786  1.0
  O  O49  1  0.410  0.112  0.214  1.0
  O  O50  1  0.090  0.612  0.714  1.0
  O  O51  1  0.910  0.388  0.286  1.0
[/CIF]
.