The crystal structure described by K2Bi(O3I)5 crystallizes in the orthorhombic Aem2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. In the second K site, K(2) is bonded to two equivalent O(6), two equivalent O(7), and four equivalent O(5) atoms to form distorted edge-sharing KO8 hexagonal bipyramids. Bi(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent K(1) and one I(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Bi(1) and one I(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Bi(1), and one I(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Bi(1), and one I(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent K(2) and one I(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one I(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(2), one I(1), and one I(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one I(3) atom. There are three inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the second I site, I(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one O(8) and two equivalent O(7) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Bi(IO3)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.391
_cell_length_b   8.392
_cell_length_c   12.466
_cell_angle_alpha   90.000
_cell_angle_beta   109.666
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   826.590
_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  0.745  0.000  0.000  1.0
  K  K1  1  0.245  0.000  0.000  1.0
  K  K2  1  0.483  0.512  0.500  1.0
  K  K3  1  0.983  0.488  0.500  1.0
  Bi  Bi4  1  0.825  0.500  0.000  1.0
  Bi  Bi5  1  0.325  0.500  0.000  1.0
  I  I6  1  0.873  0.265  0.791  1.0
  I  I7  1  0.082  0.735  0.209  1.0
  I  I8  1  0.373  0.735  0.791  1.0
  I  I9  1  0.582  0.265  0.209  1.0
  I  I10  1  0.828  0.753  0.728  1.0
  I  I11  1  0.100  0.247  0.272  1.0
  I  I12  1  0.328  0.247  0.728  1.0
  I  I13  1  0.600  0.753  0.272  1.0
  I  I14  1  0.523  0.053  0.500  1.0
  I  I15  1  0.023  0.947  0.500  1.0
  O  O16  1  0.924  0.064  0.845  1.0
  O  O17  1  0.079  0.936  0.155  1.0
  O  O18  1  0.424  0.936  0.845  1.0
  O  O19  1  0.579  0.064  0.155  1.0
  O  O20  1  0.018  0.381  0.916  1.0
  O  O21  1  0.101  0.619  0.084  1.0
  O  O22  1  0.518  0.619  0.916  1.0
  O  O23  1  0.601  0.381  0.084  1.0
  O  O24  1  0.693  0.305  0.842  1.0
  O  O25  1  0.851  0.695  0.158  1.0
  O  O26  1  0.193  0.695  0.842  1.0
  O  O27  1  0.351  0.305  0.158  1.0
  O  O28  1  0.831  0.711  0.874  1.0
  O  O29  1  0.957  0.289  0.126  1.0
  O  O30  1  0.331  0.289  0.874  1.0
  O  O31  1  0.457  0.711  0.126  1.0
  O  O32  1  0.824  0.553  0.668  1.0
  O  O33  1  0.156  0.447  0.332  1.0
  O  O34  1  0.324  0.447  0.668  1.0
  O  O35  1  0.656  0.553  0.332  1.0
  O  O36  1  0.602  0.801  0.665  1.0
  O  O37  1  0.937  0.199  0.335  1.0
  O  O38  1  0.102  0.199  0.665  1.0
  O  O39  1  0.437  0.801  0.335  1.0
  O  O40  1  0.638  0.188  0.616  1.0
  O  O41  1  0.022  0.812  0.384  1.0
  O  O42  1  0.138  0.812  0.616  1.0
  O  O43  1  0.522  0.188  0.384  1.0
  O  O44  1  0.307  0.102  0.500  1.0
  O  O45  1  0.807  0.898  0.500  1.0
[/CIF]
.
The crystal structure described by K2Bi(O3I)5 crystallizes in the orthorhombic Aem2 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. In the second K site, K(2) is bonded to two equivalent O(6), two equivalent O(7), and four equivalent O(5) atoms to form distorted edge-sharing KO8 hexagonal bipyramids. Bi(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent K(1) and one I(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Bi(1) and one I(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one Bi(1), and one I(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Bi(1), and one I(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent K(2) and one I(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one I(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(2), one I(1), and one I(3) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one I(3) atom. There are three inequivalent I sites. In the first I site, I(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(7) atom. In the second I site, I(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the third I site, I(3) is bonded in a 3-coordinate geometry to one O(8) and two equivalent O(7) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2Bi(IO3)5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.391
_cell_length_b   8.392
_cell_length_c   12.466
_cell_angle_alpha   90.000
_cell_angle_beta   109.666
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   826.590
_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  0.745  0.000  0.000  1.0
  K  K1  1  0.245  0.000  0.000  1.0
  K  K2  1  0.483  0.512  0.500  1.0
  K  K3  1  0.983  0.488  0.500  1.0
  Bi  Bi4  1  0.825  0.500  0.000  1.0
  Bi  Bi5  1  0.325  0.500  0.000  1.0
  I  I6  1  0.873  0.265  0.791  1.0
  I  I7  1  0.082  0.735  0.209  1.0
  I  I8  1  0.373  0.735  0.791  1.0
  I  I9  1  0.582  0.265  0.209  1.0
  I  I10  1  0.828  0.753  0.728  1.0
  I  I11  1  0.100  0.247  0.272  1.0
  I  I12  1  0.328  0.247  0.728  1.0
  I  I13  1  0.600  0.753  0.272  1.0
  I  I14  1  0.523  0.053  0.500  1.0
  I  I15  1  0.023  0.947  0.500  1.0
  O  O16  1  0.924  0.064  0.845  1.0
  O  O17  1  0.079  0.936  0.155  1.0
  O  O18  1  0.424  0.936  0.845  1.0
  O  O19  1  0.579  0.064  0.155  1.0
  O  O20  1  0.018  0.381  0.916  1.0
  O  O21  1  0.101  0.619  0.084  1.0
  O  O22  1  0.518  0.619  0.916  1.0
  O  O23  1  0.601  0.381  0.084  1.0
  O  O24  1  0.693  0.305  0.842  1.0
  O  O25  1  0.851  0.695  0.158  1.0
  O  O26  1  0.193  0.695  0.842  1.0
  O  O27  1  0.351  0.305  0.158  1.0
  O  O28  1  0.831  0.711  0.874  1.0
  O  O29  1  0.957  0.289  0.126  1.0
  O  O30  1  0.331  0.289  0.874  1.0
  O  O31  1  0.457  0.711  0.126  1.0
  O  O32  1  0.824  0.553  0.668  1.0
  O  O33  1  0.156  0.447  0.332  1.0
  O  O34  1  0.324  0.447  0.668  1.0
  O  O35  1  0.656  0.553  0.332  1.0
  O  O36  1  0.602  0.801  0.665  1.0
  O  O37  1  0.937  0.199  0.335  1.0
  O  O38  1  0.102  0.199  0.665  1.0
  O  O39  1  0.437  0.801  0.335  1.0
  O  O40  1  0.638  0.188  0.616  1.0
  O  O41  1  0.022  0.812  0.384  1.0
  O  O42  1  0.138  0.812  0.616  1.0
  O  O43  1  0.522  0.188  0.384  1.0
  O  O44  1  0.307  0.102  0.500  1.0
  O  O45  1  0.807  0.898  0.500  1.0
[/CIF]
.