data_Cu2B2Rh
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.03
_cell_length_b   5.03
_cell_length_c   5.03
_cell_angle_alpha   141.15
_cell_angle_beta   141.15
_cell_angle_gamma   56.11
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2B2Rh
_chemical_formula_sum   'Cu2 B2 Rh1'
_cell_volume   49.8
_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
  Cu  Cu2  1  0.0  0.67  0.22  1.0
  Cu  Cu3  1  0.67  0.0  0.22  1.0
  B  B0  1  0.0  0.0  0.27  1.0
  B  B1  1  0.0  0.0  0.62  1.0
  Rh  Rh4  1  0.0  0.0  0.0  1.0

data_Cu2B2Rh
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.74
_cell_length_b   4.74
_cell_length_c   5.03
_cell_angle_alpha   90.0
_cell_angle_beta   118.06
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Cu2B2Rh
_chemical_formula_sum   'Cu4 B4 Rh2'
_cell_volume   99.59
_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
  Cu  Cu0  4  0.38  0.16  0.55  1.0
  B  B1  2  0.12  0.5  0.62  1.0
  B  B2  2  0.27  0.0  0.27  1.0
  Rh  Rh3  2  0.0  0.0  0.0  1.0

Cu Cu B B Rh
RhCu2B2 crystallizes in the monoclinic Cm space group. Rh(1) is bonded in a distorted linear geometry to one B(1) and one B(2) atom. The Rh(1)-B(1) bond length is 1.35 Å. The Rh(1)-B(2) bond length is 1.93 Å. Cu(1) is bonded in a 2-coordinate geometry to one B(1) and two equivalent B(2) atoms. The Cu(1)-B(1) bond length is 1.46 Å. There is one shorter (1.25 Å) and one longer (2.17 Å) Cu(1)-B(2) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a 3-coordinate geometry to one Rh(1) and two equivalent Cu(1) atoms. In the second B site, B(2) is bonded in a 5-coordinate geometry to one Rh(1) and four equivalent Cu(1) atoms.