data_RbCo3Cu
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.65
_cell_length_b   4.65
_cell_length_c   4.65
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbCo3Cu
_chemical_formula_sum   'Rb1 Co3 Cu1'
_cell_volume   100.74
_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
  Rb  Rb4  1  0.33  0.33  0.33  1.0
  Co  Co0  1  0.0  0.33  0.0  1.0
  Co  Co1  1  0.0  0.0  0.33  1.0
  Co  Co2  1  0.33  0.0  0.0  1.0
  Cu  Cu3  1  0.0  0.0  0.0  1.0

data_RbCo3Cu
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.58
_cell_length_b   6.58
_cell_length_c   8.06
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   RbCo3Cu
_chemical_formula_sum   'Rb3 Co9 Cu3'
_cell_volume   302.22
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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
  Rb  Rb0  3  0.0  0.0  0.33  1.0
  Co  Co1  9  0.22  0.11  0.11  1.0
  Cu  Cu2  3  0.0  0.0  0.0  1.0

Rb Co Co Co Cu
RbCo3Cu is alpha Po structured and crystallizes in the trigonal R3m space group. The structure is zero-dimensional and consists of three RbCo3Cu clusters. Rb(1) is bonded in a 3-coordinate geometry to three equivalent Co(1) atoms. All Rb(1)-Co(1) bond lengths are 2.15 Å. Co(1) is bonded in an L-shaped geometry to one Rb(1) and one Cu(1) atom. The Co(1)-Cu(1) bond length is 1.52 Å. Cu(1) is bonded in a 3-coordinate geometry to three equivalent Co(1) atoms.