The crystal structure described by Rb2Na2IrO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form edge-sharing NaO5 trigonal bipyramids. Ir(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(1), two equivalent Na(1), two equivalent Na(2), and one Ir(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), two equivalent Rb(2), one Na(1), one Na(2), and one Ir(1) atom. In the third O site, O(3) is bonded to one Rb(1), two equivalent Rb(2), one Na(1), one Na(2), and one Ir(1) atom to form distorted corner-sharing ORb3Na2Ir octahedra. The corner-sharing octahedral tilt angles are 57°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Rb(2), two equivalent Rb(1), one Na(1), one Na(2), and one Ir(1) atom. is represented by the CIF card [CIF]
data_Rb2Na2IrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.984
_cell_length_b   6.245
_cell_length_c   9.775
_cell_angle_alpha   64.673
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   606.088
_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  0.869  0.350  0.774  1.0
  Rb  Rb1  1  0.133  0.323  0.005  1.0
  Rb  Rb2  1  0.633  0.677  0.495  1.0
  Rb  Rb3  1  0.367  0.323  0.505  1.0
  Rb  Rb4  1  0.369  0.650  0.726  1.0
  Rb  Rb5  1  0.131  0.650  0.226  1.0
  Rb  Rb6  1  0.631  0.350  0.274  1.0
  Rb  Rb7  1  0.867  0.677  0.995  1.0
  Na  Na8  1  0.611  0.939  0.092  1.0
  Na  Na9  1  0.610  0.434  0.913  1.0
  Na  Na10  1  0.890  0.434  0.413  1.0
  Na  Na11  1  0.889  0.939  0.592  1.0
  Na  Na12  1  0.110  0.566  0.587  1.0
  Na  Na13  1  0.111  0.061  0.408  1.0
  Na  Na14  1  0.390  0.566  0.087  1.0
  Na  Na15  1  0.389  0.061  0.908  1.0
  Ir  Ir16  1  0.867  0.009  0.238  1.0
  Ir  Ir17  1  0.633  0.009  0.738  1.0
  Ir  Ir18  1  0.367  0.991  0.262  1.0
  Ir  Ir19  1  0.133  0.991  0.762  1.0
  O  O20  1  0.956  0.791  0.414  1.0
  O  O21  1  0.453  0.729  0.255  1.0
  O  O22  1  0.277  0.256  0.261  1.0
  O  O23  1  0.730  0.216  0.570  1.0
  O  O24  1  0.270  0.784  0.430  1.0
  O  O25  1  0.544  0.791  0.914  1.0
  O  O26  1  0.777  0.744  0.239  1.0
  O  O27  1  0.770  0.216  0.070  1.0
  O  O28  1  0.953  0.271  0.245  1.0
  O  O29  1  0.230  0.784  0.930  1.0
  O  O30  1  0.044  0.209  0.586  1.0
  O  O31  1  0.223  0.256  0.761  1.0
  O  O32  1  0.547  0.271  0.745  1.0
  O  O33  1  0.047  0.729  0.755  1.0
  O  O34  1  0.723  0.744  0.739  1.0
  O  O35  1  0.456  0.209  0.086  1.0
[/CIF]
.
The crystal structure described by Rb2Na2IrO4 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), and two equivalent O(4) atoms. In the second Rb site, Rb(2) is bonded in a 5-coordinate geometry to one O(4), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(2), one O(3), one O(4), and two equivalent O(1) atoms. In the second Na site, Na(2) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form edge-sharing NaO5 trigonal bipyramids. Ir(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to one Rb(1), two equivalent Na(1), two equivalent Na(2), and one Ir(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one Rb(1), two equivalent Rb(2), one Na(1), one Na(2), and one Ir(1) atom. In the third O site, O(3) is bonded to one Rb(1), two equivalent Rb(2), one Na(1), one Na(2), and one Ir(1) atom to form distorted corner-sharing ORb3Na2Ir octahedra. The corner-sharing octahedral tilt angles are 57°. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Rb(2), two equivalent Rb(1), one Na(1), one Na(2), and one Ir(1) atom. is represented by the CIF card [CIF]
data_Rb2Na2IrO4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.984
_cell_length_b   6.245
_cell_length_c   9.775
_cell_angle_alpha   64.673
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   606.088
_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  0.869  0.350  0.774  1.0
  Rb  Rb1  1  0.133  0.323  0.005  1.0
  Rb  Rb2  1  0.633  0.677  0.495  1.0
  Rb  Rb3  1  0.367  0.323  0.505  1.0
  Rb  Rb4  1  0.369  0.650  0.726  1.0
  Rb  Rb5  1  0.131  0.650  0.226  1.0
  Rb  Rb6  1  0.631  0.350  0.274  1.0
  Rb  Rb7  1  0.867  0.677  0.995  1.0
  Na  Na8  1  0.611  0.939  0.092  1.0
  Na  Na9  1  0.610  0.434  0.913  1.0
  Na  Na10  1  0.890  0.434  0.413  1.0
  Na  Na11  1  0.889  0.939  0.592  1.0
  Na  Na12  1  0.110  0.566  0.587  1.0
  Na  Na13  1  0.111  0.061  0.408  1.0
  Na  Na14  1  0.390  0.566  0.087  1.0
  Na  Na15  1  0.389  0.061  0.908  1.0
  Ir  Ir16  1  0.867  0.009  0.238  1.0
  Ir  Ir17  1  0.633  0.009  0.738  1.0
  Ir  Ir18  1  0.367  0.991  0.262  1.0
  Ir  Ir19  1  0.133  0.991  0.762  1.0
  O  O20  1  0.956  0.791  0.414  1.0
  O  O21  1  0.453  0.729  0.255  1.0
  O  O22  1  0.277  0.256  0.261  1.0
  O  O23  1  0.730  0.216  0.570  1.0
  O  O24  1  0.270  0.784  0.430  1.0
  O  O25  1  0.544  0.791  0.914  1.0
  O  O26  1  0.777  0.744  0.239  1.0
  O  O27  1  0.770  0.216  0.070  1.0
  O  O28  1  0.953  0.271  0.245  1.0
  O  O29  1  0.230  0.784  0.930  1.0
  O  O30  1  0.044  0.209  0.586  1.0
  O  O31  1  0.223  0.256  0.761  1.0
  O  O32  1  0.547  0.271  0.745  1.0
  O  O33  1  0.047  0.729  0.755  1.0
  O  O34  1  0.723  0.744  0.739  1.0
  O  O35  1  0.456  0.209  0.086  1.0
[/CIF]
.