The crystal structure described by RbCrO8(NH4)2 crystallizes in the tetragonal I-42m space group. The structure consists of four ammonium molecules inside a RbCrO8 framework. In the RbCrO8 framework, Rb(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form RbO8 hexagonal bipyramids that share corners with four equivalent Cr(1)O8 hexagonal bipyramids and edges with two equivalent Cr(1)O8 hexagonal bipyramids. Cr(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted CrO8 hexagonal bipyramids that share corners with four equivalent Rb(1)O8 hexagonal bipyramids and edges with two equivalent Rb(1)O8 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Cr(1), and one O(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), one Cr(1), and one O(1) atom. is represented by the CIF file [CIF]
data_RbCrH8(NO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.502
_cell_length_b   6.502
_cell_length_c   6.502
_cell_angle_alpha   100.011
_cell_angle_beta   114.398
_cell_angle_gamma   114.398
_symmetry_Int_Tables_number   1
_cell_volume   207.364
_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  Rb0  1  0.000  0.500  0.500  1.0
  Cr  Cr1  1  0.000  0.000  0.000  1.0
  H  H2  1  0.582  0.782  0.436  1.0
  H  H3  1  0.418  0.855  0.201  1.0
  H  H4  1  0.654  0.799  0.218  1.0
  H  H5  1  0.654  0.218  0.799  1.0
  H  H6  1  0.346  0.564  0.145  1.0
  H  H7  1  0.346  0.145  0.564  1.0
  H  H8  1  0.418  0.201  0.855  1.0
  H  H9  1  0.582  0.436  0.782  1.0
  N  N10  1  0.500  0.750  0.250  1.0
  N  N11  1  0.500  0.250  0.750  1.0
  O  O12  1  0.733  0.701  0.701  1.0
  O  O13  1  0.267  0.968  0.968  1.0
  O  O14  1  0.000  0.032  0.299  1.0
  O  O15  1  0.000  0.299  0.032  1.0
  O  O16  1  0.603  0.793  0.793  1.0
  O  O17  1  0.397  0.189  0.189  1.0
  O  O18  1  0.000  0.811  0.207  1.0
  O  O19  1  0.000  0.207  0.811  1.0
[/CIF]
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The crystal structure described by RbCrO8(NH4)2 crystallizes in the tetragonal I-42m space group. The structure consists of four ammonium molecules inside a RbCrO8 framework. In the RbCrO8 framework, Rb(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form RbO8 hexagonal bipyramids that share corners with four equivalent Cr(1)O8 hexagonal bipyramids and edges with two equivalent Cr(1)O8 hexagonal bipyramids. Cr(1) is bonded to four equivalent O(1) and four equivalent O(2) atoms to form distorted CrO8 hexagonal bipyramids that share corners with four equivalent Rb(1)O8 hexagonal bipyramids and edges with two equivalent Rb(1)O8 hexagonal bipyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Rb(1), one Cr(1), and one O(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Rb(1), one Cr(1), and one O(1) atom. is represented by the CIF file [CIF]
data_RbCrH8(NO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.502
_cell_length_b   6.502
_cell_length_c   6.502
_cell_angle_alpha   100.011
_cell_angle_beta   114.398
_cell_angle_gamma   114.398
_symmetry_Int_Tables_number   1
_cell_volume   207.364
_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  Rb0  1  0.000  0.500  0.500  1.0
  Cr  Cr1  1  0.000  0.000  0.000  1.0
  H  H2  1  0.582  0.782  0.436  1.0
  H  H3  1  0.418  0.855  0.201  1.0
  H  H4  1  0.654  0.799  0.218  1.0
  H  H5  1  0.654  0.218  0.799  1.0
  H  H6  1  0.346  0.564  0.145  1.0
  H  H7  1  0.346  0.145  0.564  1.0
  H  H8  1  0.418  0.201  0.855  1.0
  H  H9  1  0.582  0.436  0.782  1.0
  N  N10  1  0.500  0.750  0.250  1.0
  N  N11  1  0.500  0.250  0.750  1.0
  O  O12  1  0.733  0.701  0.701  1.0
  O  O13  1  0.267  0.968  0.968  1.0
  O  O14  1  0.000  0.032  0.299  1.0
  O  O15  1  0.000  0.299  0.032  1.0
  O  O16  1  0.603  0.793  0.793  1.0
  O  O17  1  0.397  0.189  0.189  1.0
  O  O18  1  0.000  0.811  0.207  1.0
  O  O19  1  0.000  0.207  0.811  1.0
[/CIF]
.