The structure described by Rb2CuBr3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent Br(1), two equivalent Br(2), and three equivalent Br(3) atoms to form distorted RbBr7 pentagonal bipyramids that share corners with two equivalent Rb(1)Br7 pentagonal bipyramids,  a cornercorner with one Cu(1)Br4 tetrahedra, edges with four equivalent Rb(1)Br7 pentagonal bipyramids, and edges with four equivalent Cu(1)Br4 tetrahedra. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to two equivalent Br(1), two equivalent Br(3), and three equivalent Br(2) atoms. Cu(1) is bonded to one Br(2), one Br(3), and two equivalent Br(1) atoms to form CuBr4 tetrahedra that share  a cornercorner with one Rb(1)Br7 pentagonal bipyramid, corners with two equivalent Cu(1)Br4 tetrahedra, and edges with four equivalent Rb(1)Br7 pentagonal bipyramids. There are three inequivalent Br sites. In the first Br site, Br(1) is bonded to two equivalent Rb(1), two equivalent Rb(2), and two equivalent Cu(1) atoms to form distorted BrRb4Cu2 octahedra that share corners with two equivalent Br(1)Rb4Cu2 octahedra, corners with two equivalent Br(2)Rb5Cu octahedra, corners with five equivalent Br(3)Rb5Cu octahedra, edges with two equivalent Br(1)Rb4Cu2 octahedra, edges with two equivalent Br(3)Rb5Cu octahedra, edges with five equivalent Br(2)Rb5Cu octahedra, and  a faceface with one Br(3)Rb5Cu octahedra. The corner-sharing octahedral tilt angles range from 14-61°. In the second Br site, Br(2) is bonded to two equivalent Rb(1), three equivalent Rb(2), and one Cu(1) atom to form distorted BrRb5Cu octahedra that share corners with two equivalent Br(1)Rb4Cu2 octahedra, corners with eight equivalent Br(3)Rb5Cu octahedra,  an edgeedge with one Br(3)Rb5Cu octahedra, edges with four equivalent Br(2)Rb5Cu octahedra, edges with five equivalent Br(1)Rb4Cu2 octahedra, and  a faceface with one Br(3)Rb5Cu octahedra. The corner-sharing octahedral tilt angles range from 14-59°. In the third Br site, Br(3) is bonded to two equivalent Rb(2), three equivalent Rb(1), and one Cu(1) atom to form distorted BrRb5Cu octahedra that share corners with five equivalent Br(1)Rb4Cu2 octahedra, corners with eight equivalent Br(2)Rb5Cu octahedra,  an edgeedge with one Br(2)Rb5Cu octahedra, edges with two equivalent Br(1)Rb4Cu2 octahedra, edges with four equivalent Br(3)Rb5Cu octahedra,  a faceface with one Br(1)Rb4Cu2 octahedra, and  a faceface with one Br(2)Rb5Cu octahedra. The corner-sharing octahedral tilt angles range from 26-61°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2CuBr3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.412
_cell_length_b   13.154
_cell_length_c   13.648
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   792.087
_cell_formula_units_Z   4
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  Rb0  1  0.750  0.987  0.825  1.0
  Rb  Rb1  1  0.250  0.013  0.175  1.0
  Rb  Rb2  1  0.750  0.826  0.476  1.0
  Rb  Rb3  1  0.250  0.174  0.524  1.0
  Rb  Rb4  1  0.750  0.487  0.675  1.0
  Rb  Rb5  1  0.250  0.674  0.976  1.0
  Rb  Rb6  1  0.750  0.326  0.024  1.0
  Rb  Rb7  1  0.250  0.513  0.325  1.0
  Cu  Cu8  1  0.250  0.757  0.691  1.0
  Cu  Cu9  1  0.250  0.257  0.809  1.0
  Cu  Cu10  1  0.750  0.243  0.309  1.0
  Cu  Cu11  1  0.750  0.743  0.191  1.0
  Br  Br12  1  0.750  0.227  0.721  1.0
  Br  Br13  1  0.250  0.273  0.221  1.0
  Br  Br14  1  0.250  0.435  0.862  1.0
  Br  Br15  1  0.750  0.362  0.448  1.0
  Br  Br16  1  0.250  0.773  0.279  1.0
  Br  Br17  1  0.750  0.565  0.138  1.0
  Br  Br18  1  0.750  0.065  0.362  1.0
  Br  Br19  1  0.250  0.935  0.638  1.0
  Br  Br20  1  0.750  0.727  0.779  1.0
  Br  Br21  1  0.250  0.138  0.948  1.0
  Br  Br22  1  0.750  0.862  0.052  1.0
  Br  Br23  1  0.250  0.638  0.552  1.0
[/CIF]
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The structure described by Rb2CuBr3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded to two equivalent Br(1), two equivalent Br(2), and three equivalent Br(3) atoms to form distorted RbBr7 pentagonal bipyramids that share corners with two equivalent Rb(1)Br7 pentagonal bipyramids,  a cornercorner with one Cu(1)Br4 tetrahedra, edges with four equivalent Rb(1)Br7 pentagonal bipyramids, and edges with four equivalent Cu(1)Br4 tetrahedra. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to two equivalent Br(1), two equivalent Br(3), and three equivalent Br(2) atoms. Cu(1) is bonded to one Br(2), one Br(3), and two equivalent Br(1) atoms to form CuBr4 tetrahedra that share  a cornercorner with one Rb(1)Br7 pentagonal bipyramid, corners with two equivalent Cu(1)Br4 tetrahedra, and edges with four equivalent Rb(1)Br7 pentagonal bipyramids. There are three inequivalent Br sites. In the first Br site, Br(1) is bonded to two equivalent Rb(1), two equivalent Rb(2), and two equivalent Cu(1) atoms to form distorted BrRb4Cu2 octahedra that share corners with two equivalent Br(1)Rb4Cu2 octahedra, corners with two equivalent Br(2)Rb5Cu octahedra, corners with five equivalent Br(3)Rb5Cu octahedra, edges with two equivalent Br(1)Rb4Cu2 octahedra, edges with two equivalent Br(3)Rb5Cu octahedra, edges with five equivalent Br(2)Rb5Cu octahedra, and  a faceface with one Br(3)Rb5Cu octahedra. The corner-sharing octahedral tilt angles range from 14-61°. In the second Br site, Br(2) is bonded to two equivalent Rb(1), three equivalent Rb(2), and one Cu(1) atom to form distorted BrRb5Cu octahedra that share corners with two equivalent Br(1)Rb4Cu2 octahedra, corners with eight equivalent Br(3)Rb5Cu octahedra,  an edgeedge with one Br(3)Rb5Cu octahedra, edges with four equivalent Br(2)Rb5Cu octahedra, edges with five equivalent Br(1)Rb4Cu2 octahedra, and  a faceface with one Br(3)Rb5Cu octahedra. The corner-sharing octahedral tilt angles range from 14-59°. In the third Br site, Br(3) is bonded to two equivalent Rb(2), three equivalent Rb(1), and one Cu(1) atom to form distorted BrRb5Cu octahedra that share corners with five equivalent Br(1)Rb4Cu2 octahedra, corners with eight equivalent Br(2)Rb5Cu octahedra,  an edgeedge with one Br(2)Rb5Cu octahedra, edges with two equivalent Br(1)Rb4Cu2 octahedra, edges with four equivalent Br(3)Rb5Cu octahedra,  a faceface with one Br(1)Rb4Cu2 octahedra, and  a faceface with one Br(2)Rb5Cu octahedra. The corner-sharing octahedral tilt angles range from 26-61°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2CuBr3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.412
_cell_length_b   13.154
_cell_length_c   13.648
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   792.087
_cell_formula_units_Z   4
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  Rb0  1  0.750  0.987  0.825  1.0
  Rb  Rb1  1  0.250  0.013  0.175  1.0
  Rb  Rb2  1  0.750  0.826  0.476  1.0
  Rb  Rb3  1  0.250  0.174  0.524  1.0
  Rb  Rb4  1  0.750  0.487  0.675  1.0
  Rb  Rb5  1  0.250  0.674  0.976  1.0
  Rb  Rb6  1  0.750  0.326  0.024  1.0
  Rb  Rb7  1  0.250  0.513  0.325  1.0
  Cu  Cu8  1  0.250  0.757  0.691  1.0
  Cu  Cu9  1  0.250  0.257  0.809  1.0
  Cu  Cu10  1  0.750  0.243  0.309  1.0
  Cu  Cu11  1  0.750  0.743  0.191  1.0
  Br  Br12  1  0.750  0.227  0.721  1.0
  Br  Br13  1  0.250  0.273  0.221  1.0
  Br  Br14  1  0.250  0.435  0.862  1.0
  Br  Br15  1  0.750  0.362  0.448  1.0
  Br  Br16  1  0.250  0.773  0.279  1.0
  Br  Br17  1  0.750  0.565  0.138  1.0
  Br  Br18  1  0.750  0.065  0.362  1.0
  Br  Br19  1  0.250  0.935  0.638  1.0
  Br  Br20  1  0.750  0.727  0.779  1.0
  Br  Br21  1  0.250  0.138  0.948  1.0
  Br  Br22  1  0.750  0.862  0.052  1.0
  Br  Br23  1  0.250  0.638  0.552  1.0
[/CIF]
.