The structure described by K2OsO5 crystallizes in the hexagonal P-6 space group. There are five inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. In the third K site, K(3) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(5) atoms. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms. In the fifth K site, K(5) is bonded in a 9-coordinate geometry to three equivalent O(6), three equivalent O(7), and three equivalent O(8) atoms. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a trigonal bipyramidal geometry to one O(4), one O(5), one O(8), and two equivalent O(2) atoms. In the second Os site, Os(2) is bonded in a trigonal bipyramidal geometry to one O(1), one O(3), one O(7), and two equivalent O(6) atoms. There are eight inequivalent O sites. In the first O site, O(7) is bonded to one K(1), two equivalent K(5), and one Os(2) atom to form distorted edge-sharing OK3Os tetrahedra. In the second O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(4), two equivalent K(5), and one Os(1) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent K(3), and one Os(2) atom. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(3), one K(4), and one Os(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one Os(2) atom. In the sixth O site, O(4) is bonded to one K(4), two equivalent K(2), and one Os(1) atom to form a mixture of distorted corner and edge-sharing OK3Os tetrahedra. In the seventh O site, O(5) is bonded to one K(4), two equivalent K(3), and one Os(1) atom to form a mixture of distorted corner and edge-sharing OK3Os tetrahedra. In the eighth O site, O(6) is bonded in a 4-coordinate geometry to one K(1), one K(4), one K(5), and one Os(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2OsO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.920
_cell_length_b   10.920
_cell_length_c   8.298
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   856.998
_cell_formula_units_Z   6
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  0.295  0.965  0.500  1.0
  K  K1  1  0.035  0.330  0.500  1.0
  K  K2  1  0.333  0.667  0.758  1.0
  K  K3  1  0.000  0.000  0.753  1.0
  K  K4  1  0.000  0.000  0.247  1.0
  K  K5  1  0.333  0.667  0.242  1.0
  K  K6  1  0.364  0.331  0.000  1.0
  K  K7  1  0.670  0.705  0.500  1.0
  K  K8  1  0.667  0.333  0.259  1.0
  K  K9  1  0.667  0.333  0.741  1.0
  K  K10  1  0.967  0.636  0.000  1.0
  K  K11  1  0.669  0.033  0.000  1.0
  Os  Os12  1  0.301  0.967  0.000  1.0
  Os  Os13  1  0.033  0.334  0.000  1.0
  Os  Os14  1  0.363  0.321  0.500  1.0
  Os  Os15  1  0.666  0.699  0.000  1.0
  Os  Os16  1  0.679  0.042  0.500  1.0
  Os  Os17  1  0.958  0.637  0.500  1.0
  O  O18  1  0.018  0.826  0.500  1.0
  O  O19  1  0.216  0.881  0.816  1.0
  O  O20  1  0.216  0.881  0.184  1.0
  O  O21  1  0.134  0.664  0.500  1.0
  O  O22  1  0.131  0.528  0.000  1.0
  O  O23  1  0.119  0.335  0.184  1.0
  O  O24  1  0.119  0.335  0.816  1.0
  O  O25  1  0.397  0.869  0.000  1.0
  O  O26  1  0.174  0.192  0.500  1.0
  O  O27  1  0.336  0.470  0.500  1.0
  O  O28  1  0.530  0.866  0.500  1.0
  O  O29  1  0.472  0.603  0.000  1.0
  O  O30  1  0.201  0.061  0.000  1.0
  O  O31  1  0.378  0.249  0.312  1.0
  O  O32  1  0.378  0.249  0.688  1.0
  O  O33  1  0.665  0.784  0.184  1.0
  O  O34  1  0.665  0.784  0.816  1.0
  O  O35  1  0.808  0.982  0.500  1.0
  O  O36  1  0.556  0.435  0.500  1.0
  O  O37  1  0.466  0.132  0.000  1.0
  O  O38  1  0.665  0.534  0.000  1.0
  O  O39  1  0.859  0.799  0.000  1.0
  O  O40  1  0.565  0.121  0.500  1.0
  O  O41  1  0.871  0.622  0.312  1.0
  O  O42  1  0.871  0.622  0.688  1.0
  O  O43  1  0.879  0.444  0.500  1.0
  O  O44  1  0.751  0.129  0.312  1.0
  O  O45  1  0.751  0.129  0.688  1.0
  O  O46  1  0.868  0.335  0.000  1.0
  O  O47  1  0.939  0.141  0.000  1.0
[/CIF]
.
The structure described by K2OsO5 crystallizes in the hexagonal P-6 space group. There are five inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one O(7), two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. In the third K site, K(3) is bonded in a 9-coordinate geometry to three equivalent O(1), three equivalent O(2), and three equivalent O(5) atoms. In the fourth K site, K(4) is bonded in a 8-coordinate geometry to one O(4), one O(5), two equivalent O(2), two equivalent O(6), and two equivalent O(8) atoms. In the fifth K site, K(5) is bonded in a 9-coordinate geometry to three equivalent O(6), three equivalent O(7), and three equivalent O(8) atoms. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded in a trigonal bipyramidal geometry to one O(4), one O(5), one O(8), and two equivalent O(2) atoms. In the second Os site, Os(2) is bonded in a trigonal bipyramidal geometry to one O(1), one O(3), one O(7), and two equivalent O(6) atoms. There are eight inequivalent O sites. In the first O site, O(7) is bonded to one K(1), two equivalent K(5), and one Os(2) atom to form distorted edge-sharing OK3Os tetrahedra. In the second O site, O(8) is bonded in a distorted single-bond geometry to two equivalent K(4), two equivalent K(5), and one Os(1) atom. In the third O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1), two equivalent K(3), and one Os(2) atom. In the fourth O site, O(2) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(3), one K(4), and one Os(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent K(1), two equivalent K(2), and one Os(2) atom. In the sixth O site, O(4) is bonded to one K(4), two equivalent K(2), and one Os(1) atom to form a mixture of distorted corner and edge-sharing OK3Os tetrahedra. In the seventh O site, O(5) is bonded to one K(4), two equivalent K(3), and one Os(1) atom to form a mixture of distorted corner and edge-sharing OK3Os tetrahedra. In the eighth O site, O(6) is bonded in a 4-coordinate geometry to one K(1), one K(4), one K(5), and one Os(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2OsO5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.920
_cell_length_b   10.920
_cell_length_c   8.298
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   856.998
_cell_formula_units_Z   6
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  0.295  0.965  0.500  1.0
  K  K1  1  0.035  0.330  0.500  1.0
  K  K2  1  0.333  0.667  0.758  1.0
  K  K3  1  0.000  0.000  0.753  1.0
  K  K4  1  0.000  0.000  0.247  1.0
  K  K5  1  0.333  0.667  0.242  1.0
  K  K6  1  0.364  0.331  0.000  1.0
  K  K7  1  0.670  0.705  0.500  1.0
  K  K8  1  0.667  0.333  0.259  1.0
  K  K9  1  0.667  0.333  0.741  1.0
  K  K10  1  0.967  0.636  0.000  1.0
  K  K11  1  0.669  0.033  0.000  1.0
  Os  Os12  1  0.301  0.967  0.000  1.0
  Os  Os13  1  0.033  0.334  0.000  1.0
  Os  Os14  1  0.363  0.321  0.500  1.0
  Os  Os15  1  0.666  0.699  0.000  1.0
  Os  Os16  1  0.679  0.042  0.500  1.0
  Os  Os17  1  0.958  0.637  0.500  1.0
  O  O18  1  0.018  0.826  0.500  1.0
  O  O19  1  0.216  0.881  0.816  1.0
  O  O20  1  0.216  0.881  0.184  1.0
  O  O21  1  0.134  0.664  0.500  1.0
  O  O22  1  0.131  0.528  0.000  1.0
  O  O23  1  0.119  0.335  0.184  1.0
  O  O24  1  0.119  0.335  0.816  1.0
  O  O25  1  0.397  0.869  0.000  1.0
  O  O26  1  0.174  0.192  0.500  1.0
  O  O27  1  0.336  0.470  0.500  1.0
  O  O28  1  0.530  0.866  0.500  1.0
  O  O29  1  0.472  0.603  0.000  1.0
  O  O30  1  0.201  0.061  0.000  1.0
  O  O31  1  0.378  0.249  0.312  1.0
  O  O32  1  0.378  0.249  0.688  1.0
  O  O33  1  0.665  0.784  0.184  1.0
  O  O34  1  0.665  0.784  0.816  1.0
  O  O35  1  0.808  0.982  0.500  1.0
  O  O36  1  0.556  0.435  0.500  1.0
  O  O37  1  0.466  0.132  0.000  1.0
  O  O38  1  0.665  0.534  0.000  1.0
  O  O39  1  0.859  0.799  0.000  1.0
  O  O40  1  0.565  0.121  0.500  1.0
  O  O41  1  0.871  0.622  0.312  1.0
  O  O42  1  0.871  0.622  0.688  1.0
  O  O43  1  0.879  0.444  0.500  1.0
  O  O44  1  0.751  0.129  0.312  1.0
  O  O45  1  0.751  0.129  0.688  1.0
  O  O46  1  0.868  0.335  0.000  1.0
  O  O47  1  0.939  0.141  0.000  1.0
[/CIF]
.