The crystal structure described by Rb2TaF7 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent F(3) and four equivalent F(1) atoms. In the second Rb site, Rb(2) is bonded to four equivalent F(2) and eight equivalent F(1) atoms to form RbF12 cuboctahedra that share corners with four equivalent Rb(2)F12 cuboctahedra, faces with four equivalent Rb(2)F12 cuboctahedra, and faces with four equivalent Ta(1)F7 pentagonal bipyramids. Ta(1) is bonded to one F(2), two equivalent F(3), and four equivalent F(1) atoms to form distorted TaF7 pentagonal bipyramids that share faces with four equivalent Rb(2)F12 cuboctahedra. There are three inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one Ta(1) atom. In the second F site, F(2) is bonded in a distorted single-bond geometry to four equivalent Rb(2) and one Ta(1) atom. In the third F site, F(3) is bonded in a 1-coordinate geometry to one Rb(1) and one Ta(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2TaF7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.889
_cell_length_b   5.824
_cell_length_c   10.465
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   358.913
_cell_formula_units_Z   2
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  0.362  1.0
  Rb  Rb1  1  0.500  0.000  0.638  1.0
  Rb  Rb2  1  0.500  0.500  0.994  1.0
  Rb  Rb3  1  0.000  0.000  0.006  1.0
  Ta  Ta4  1  0.000  0.500  0.756  1.0
  Ta  Ta5  1  0.500  0.000  0.244  1.0
  F  F6  1  0.216  0.256  0.798  1.0
  F  F7  1  0.284  0.244  0.202  1.0
  F  F8  1  0.716  0.756  0.202  1.0
  F  F9  1  0.784  0.744  0.798  1.0
  F  F10  1  0.216  0.744  0.798  1.0
  F  F11  1  0.716  0.244  0.202  1.0
  F  F12  1  0.284  0.756  0.202  1.0
  F  F13  1  0.784  0.256  0.798  1.0
  F  F14  1  0.000  0.500  0.949  1.0
  F  F15  1  0.500  0.000  0.051  1.0
  F  F16  1  0.203  0.500  0.608  1.0
  F  F17  1  0.797  0.500  0.608  1.0
  F  F18  1  0.297  0.000  0.392  1.0
  F  F19  1  0.703  0.000  0.392  1.0
[/CIF]
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The crystal structure described by Rb2TaF7 crystallizes in the orthorhombic Pmmn space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 6-coordinate geometry to two equivalent F(3) and four equivalent F(1) atoms. In the second Rb site, Rb(2) is bonded to four equivalent F(2) and eight equivalent F(1) atoms to form RbF12 cuboctahedra that share corners with four equivalent Rb(2)F12 cuboctahedra, faces with four equivalent Rb(2)F12 cuboctahedra, and faces with four equivalent Ta(1)F7 pentagonal bipyramids. Ta(1) is bonded to one F(2), two equivalent F(3), and four equivalent F(1) atoms to form distorted TaF7 pentagonal bipyramids that share faces with four equivalent Rb(2)F12 cuboctahedra. There are three inequivalent F sites. In the first F site, F(1) is bonded in a distorted single-bond geometry to one Rb(1), two equivalent Rb(2), and one Ta(1) atom. In the second F site, F(2) is bonded in a distorted single-bond geometry to four equivalent Rb(2) and one Ta(1) atom. In the third F site, F(3) is bonded in a 1-coordinate geometry to one Rb(1) and one Ta(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2TaF7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.889
_cell_length_b   5.824
_cell_length_c   10.465
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   358.913
_cell_formula_units_Z   2
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  0.362  1.0
  Rb  Rb1  1  0.500  0.000  0.638  1.0
  Rb  Rb2  1  0.500  0.500  0.994  1.0
  Rb  Rb3  1  0.000  0.000  0.006  1.0
  Ta  Ta4  1  0.000  0.500  0.756  1.0
  Ta  Ta5  1  0.500  0.000  0.244  1.0
  F  F6  1  0.216  0.256  0.798  1.0
  F  F7  1  0.284  0.244  0.202  1.0
  F  F8  1  0.716  0.756  0.202  1.0
  F  F9  1  0.784  0.744  0.798  1.0
  F  F10  1  0.216  0.744  0.798  1.0
  F  F11  1  0.716  0.244  0.202  1.0
  F  F12  1  0.284  0.756  0.202  1.0
  F  F13  1  0.784  0.256  0.798  1.0
  F  F14  1  0.000  0.500  0.949  1.0
  F  F15  1  0.500  0.000  0.051  1.0
  F  F16  1  0.203  0.500  0.608  1.0
  F  F17  1  0.797  0.500  0.608  1.0
  F  F18  1  0.297  0.000  0.392  1.0
  F  F19  1  0.703  0.000  0.392  1.0
[/CIF]
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