data_Al3RhBr
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.88
_cell_length_b   4.88
_cell_length_c   4.88
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Al3RhBr
_chemical_formula_sum   'Al3 Rh1 Br1'
_cell_volume   116.38
_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
  Al  Al1  1  0.0  0.44  0.0  1.0
  Al  Al2  1  0.0  0.0  0.44  1.0
  Al  Al3  1  0.44  0.0  0.0  1.0
  Rh  Rh0  1  0.44  0.44  0.44  1.0
  Br  Br4  1  0.0  0.0  0.0  1.0

data_Al3RhBr
_symmetry_space_group_name_H-M   R3m
_cell_length_a   6.9
_cell_length_b   6.9
_cell_length_c   8.46
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Al3RhBr
_chemical_formula_sum   'Al9 Rh3 Br3'
_cell_volume   349.15
_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
  Al  Al0  9  0.19  0.37  0.81  1.0
  Rh  Rh1  3  0.0  0.0  0.44  1.0
  Br  Br2  3  0.0  0.0  0.0  1.0

Al Al Al Rh Br
RhAl3Br crystallizes in the trigonal R3m space group. Rh(1) is bonded in a 3-coordinate geometry to three equivalent Al(1) atoms. All Rh(1)-Al(1) bond lengths are 3.05 Å. Al(1) is bonded in a 3-coordinate geometry to one Rh(1) and two equivalent Br(1) atoms. There is one shorter (2.15 Å) and one longer (2.73 Å) Al(1)-Br(1) bond length. Br(1) is bonded to six equivalent Al(1) atoms to form corner-sharing BrAl6 octahedra. The corner-sharing octahedra are not tilted.