data_KCu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.47
_cell_length_b   9.47
_cell_length_c   9.47
_cell_angle_alpha   26.08
_cell_angle_beta   26.08
_cell_angle_gamma   26.08
_symmetry_Int_Tables_number   1
_chemical_formula_structural   KCu
_chemical_formula_sum   'K2 Cu2'
_cell_volume   144.83
_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  K2  1  0.0  0.0  0.41  1.0
  K  K3  1  0.0  0.0  0.03  1.0
  Cu  Cu0  1  0.0  0.0  0.86  1.0
  Cu  Cu1  1  0.0  0.0  0.58  1.0

data_KCu
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   7.41
_cell_length_b   4.28
_cell_length_c   9.47
_cell_angle_alpha   90.0
_cell_angle_beta   105.1
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   KCu
_chemical_formula_sum   'K4 Cu4'
_cell_volume   289.67
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  '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  4  0.0  0.0  0.31  1.0
  Cu  Cu1  4  0.0  0.0  0.14  1.0

K K Cu Cu
CuK is alpha carbon monoxide-like structured and crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of four CuK clusters. K(1) is bonded in a single-bond geometry to one Cu(1) atom. The K(1)-Cu(1) bond length is 1.58 Å. Cu(1) is bonded in a single-bond geometry to one K(1) atom.