The material described by Na2C4Bi2SO16 crystallizes in the orthorhombic Fddd space group. Na(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share edges with two equivalent Bi(1)O6 octahedra and  an edgeedge with one S(1)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Bi(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BiO6 octahedra that share edges with two equivalent Na(1)O6 octahedra. S(1) is bonded to four equivalent O(4) atoms to form SO4 tetrahedra that share edges with two equivalent Na(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one C(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one C(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Na(1), one C(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Na(1) and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Bi2C4SO16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.689
_cell_length_b   10.535
_cell_length_c   10.395
_cell_angle_alpha   61.418
_cell_angle_beta   59.939
_cell_angle_gamma   58.643
_symmetry_Int_Tables_number   1
_cell_volume   826.761
_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
  Na  Na0  1  0.291  0.709  0.709  1.0
  Na  Na1  1  0.709  0.291  0.291  1.0
  Na  Na2  1  0.541  0.959  0.959  1.0
  Na  Na3  1  0.959  0.541  0.541  1.0
  Bi  Bi4  1  0.125  0.125  0.625  1.0
  Bi  Bi5  1  0.125  0.125  0.125  1.0
  Bi  Bi6  1  0.625  0.125  0.125  1.0
  Bi  Bi7  1  0.125  0.625  0.125  1.0
  C  C8  1  0.279  0.900  0.909  1.0
  C  C9  1  0.900  0.279  0.912  1.0
  C  C10  1  0.909  0.912  0.279  1.0
  C  C11  1  0.912  0.909  0.900  1.0
  C  C12  1  0.338  0.341  0.350  1.0
  C  C13  1  0.341  0.338  0.971  1.0
  C  C14  1  0.350  0.971  0.338  1.0
  C  C15  1  0.971  0.350  0.341  1.0
  S  S16  1  0.500  0.500  0.500  1.0
  S  S17  1  0.750  0.750  0.750  1.0
  O  O18  1  0.274  0.913  0.781  1.0
  O  O19  1  0.273  0.777  0.025  1.0
  O  O20  1  0.913  0.274  0.032  1.0
  O  O21  1  0.777  0.273  0.925  1.0
  O  O22  1  0.240  0.957  0.472  1.0
  O  O23  1  0.025  0.925  0.273  1.0
  O  O24  1  0.957  0.240  0.330  1.0
  O  O25  1  0.920  0.778  0.293  1.0
  O  O26  1  0.781  0.032  0.274  1.0
  O  O27  1  0.560  0.553  0.327  1.0
  O  O28  1  0.472  0.330  0.240  1.0
  O  O29  1  0.923  0.689  0.690  1.0
  O  O30  1  0.925  0.025  0.777  1.0
  O  O31  1  0.032  0.781  0.913  1.0
  O  O32  1  0.553  0.560  0.561  1.0
  O  O33  1  0.561  0.327  0.553  1.0
  O  O34  1  0.689  0.923  0.697  1.0
  O  O35  1  0.697  0.690  0.689  1.0
  O  O36  1  0.218  0.469  0.337  1.0
  O  O37  1  0.325  0.225  0.473  1.0
  O  O38  1  0.327  0.561  0.560  1.0
  O  O39  1  0.778  0.920  0.010  1.0
  O  O40  1  0.690  0.697  0.923  1.0
  O  O41  1  0.469  0.218  0.976  1.0
  O  O42  1  0.330  0.472  0.957  1.0
  O  O43  1  0.293  0.010  0.920  1.0
  O  O44  1  0.225  0.325  0.977  1.0
  O  O45  1  0.010  0.293  0.778  1.0
  O  O46  1  0.473  0.977  0.325  1.0
  O  O47  1  0.337  0.976  0.218  1.0
  O  O48  1  0.977  0.473  0.225  1.0
  O  O49  1  0.976  0.337  0.469  1.0
[/CIF]
.
The material described by Na2C4Bi2SO16 crystallizes in the orthorhombic Fddd space group. Na(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form distorted NaO6 octahedra that share edges with two equivalent Bi(1)O6 octahedra and  an edgeedge with one S(1)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Bi(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form BiO6 octahedra that share edges with two equivalent Na(1)O6 octahedra. S(1) is bonded to four equivalent O(4) atoms to form SO4 tetrahedra that share edges with two equivalent Na(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one C(1), and one Bi(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one C(1) and one Bi(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Na(1), one C(1), and one Bi(1) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Na(1) and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Bi2C4SO16
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.689
_cell_length_b   10.535
_cell_length_c   10.395
_cell_angle_alpha   61.418
_cell_angle_beta   59.939
_cell_angle_gamma   58.643
_symmetry_Int_Tables_number   1
_cell_volume   826.761
_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
  Na  Na0  1  0.291  0.709  0.709  1.0
  Na  Na1  1  0.709  0.291  0.291  1.0
  Na  Na2  1  0.541  0.959  0.959  1.0
  Na  Na3  1  0.959  0.541  0.541  1.0
  Bi  Bi4  1  0.125  0.125  0.625  1.0
  Bi  Bi5  1  0.125  0.125  0.125  1.0
  Bi  Bi6  1  0.625  0.125  0.125  1.0
  Bi  Bi7  1  0.125  0.625  0.125  1.0
  C  C8  1  0.279  0.900  0.909  1.0
  C  C9  1  0.900  0.279  0.912  1.0
  C  C10  1  0.909  0.912  0.279  1.0
  C  C11  1  0.912  0.909  0.900  1.0
  C  C12  1  0.338  0.341  0.350  1.0
  C  C13  1  0.341  0.338  0.971  1.0
  C  C14  1  0.350  0.971  0.338  1.0
  C  C15  1  0.971  0.350  0.341  1.0
  S  S16  1  0.500  0.500  0.500  1.0
  S  S17  1  0.750  0.750  0.750  1.0
  O  O18  1  0.274  0.913  0.781  1.0
  O  O19  1  0.273  0.777  0.025  1.0
  O  O20  1  0.913  0.274  0.032  1.0
  O  O21  1  0.777  0.273  0.925  1.0
  O  O22  1  0.240  0.957  0.472  1.0
  O  O23  1  0.025  0.925  0.273  1.0
  O  O24  1  0.957  0.240  0.330  1.0
  O  O25  1  0.920  0.778  0.293  1.0
  O  O26  1  0.781  0.032  0.274  1.0
  O  O27  1  0.560  0.553  0.327  1.0
  O  O28  1  0.472  0.330  0.240  1.0
  O  O29  1  0.923  0.689  0.690  1.0
  O  O30  1  0.925  0.025  0.777  1.0
  O  O31  1  0.032  0.781  0.913  1.0
  O  O32  1  0.553  0.560  0.561  1.0
  O  O33  1  0.561  0.327  0.553  1.0
  O  O34  1  0.689  0.923  0.697  1.0
  O  O35  1  0.697  0.690  0.689  1.0
  O  O36  1  0.218  0.469  0.337  1.0
  O  O37  1  0.325  0.225  0.473  1.0
  O  O38  1  0.327  0.561  0.560  1.0
  O  O39  1  0.778  0.920  0.010  1.0
  O  O40  1  0.690  0.697  0.923  1.0
  O  O41  1  0.469  0.218  0.976  1.0
  O  O42  1  0.330  0.472  0.957  1.0
  O  O43  1  0.293  0.010  0.920  1.0
  O  O44  1  0.225  0.325  0.977  1.0
  O  O45  1  0.010  0.293  0.778  1.0
  O  O46  1  0.473  0.977  0.325  1.0
  O  O47  1  0.337  0.976  0.218  1.0
  O  O48  1  0.977  0.473  0.225  1.0
  O  O49  1  0.976  0.337  0.469  1.0
[/CIF]
.