data_KCuOs2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.9
_cell_length_b   2.9
_cell_length_c   8.81
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KCuOs2
_chemical_formula_sum   'K1 Cu1 Os2'
_cell_volume   73.85
_cell_formula_units_Z   1
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  K1  1  0.0  0.0  0.59  1.0
  Cu  Cu0  1  0.45  0.45  0.86  1.0
  Os  Os2  1  0.45  0.45  0.6  1.0
  Os  Os3  1  0.0  0.0  0.16  1.0

data_KCuOs2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.09
_cell_length_b   4.09
_cell_length_c   8.81
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   KCuOs2
_chemical_formula_sum   'K2 Cu2 Os4'
_cell_volume   147.7
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  2  0.0  0.0  0.59  1.0
  Cu  Cu1  2  0.45  0.0  0.86  1.0
  Os  Os2  2  0.0  0.0  0.16  1.0
  Os  Os3  2  0.45  0.0  0.6  1.0

K Cu Os Os
KOs2Cu crystallizes in the monoclinic Cm space group. K(1) is bonded in a distorted square co-planar geometry to one Os(2) and four equivalent Os(1) atoms. The K(1)-Os(2) bond length is 3.81 Å. There are a spread of K(1)-Os(1) bond distances ranging from 1.83-2.26 Å. There are two inequivalent Os sites. In the first Os site, Os(1) is bonded to four equivalent K(1) and one Cu(1) atom to form a mixture of distorted edge and corner-sharing OsK4Cu square pyramids. The Os(1)-Cu(1) bond length is 2.34 Å. In the second Os site, Os(2) is bonded in a 9-coordinate geometry to one K(1), four equivalent Os(2), and four equivalent Cu(1) atoms. All Os(2)-Os(2) bond lengths are 2.90 Å. There are a spread of Os(2)-Cu(1) bond distances ranging from 3.21-3.48 Å. Cu(1) is bonded in a distorted single-bond geometry to one Os(1) and four equivalent Os(2) atoms.