The compound described by Rb2MoO2As2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(8), and two equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one O(9), and two equivalent O(7) atoms. Mo(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form distorted MoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra and corners with two equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(5), one O(6), one O(7), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent Mo(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the second As site, As(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with two equivalent Mo(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-55°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Mo(1), and one As(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Mo(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Mo(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to two equivalent Rb(2) and one As(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one As(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Rb(2), one Mo(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2MoAs2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.666
_cell_length_b   7.794
_cell_length_c   9.233
_cell_angle_alpha   109.831
_cell_angle_beta   102.365
_cell_angle_gamma   87.985
_symmetry_Int_Tables_number   1
_cell_volume   506.462
_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  0.916  0.253  0.635  1.0
  Rb  Rb1  1  0.190  0.831  0.881  1.0
  Rb  Rb2  1  0.084  0.747  0.365  1.0
  Rb  Rb3  1  0.810  0.169  0.119  1.0
  Mo  Mo4  1  0.426  0.237  0.745  1.0
  Mo  Mo5  1  0.574  0.763  0.255  1.0
  As  As6  1  0.317  0.348  0.098  1.0
  As  As7  1  0.683  0.652  0.902  1.0
  As  As8  1  0.672  0.836  0.642  1.0
  As  As9  1  0.328  0.164  0.358  1.0
  O  O10  1  0.731  0.948  0.335  1.0
  O  O11  1  0.483  0.222  0.537  1.0
  O  O12  1  0.287  0.422  0.767  1.0
  O  O13  1  0.713  0.578  0.233  1.0
  O  O14  1  0.655  0.060  0.755  1.0
  O  O15  1  0.331  0.581  0.161  1.0
  O  O16  1  0.517  0.778  0.463  1.0
  O  O17  1  0.569  0.703  0.729  1.0
  O  O18  1  0.345  0.940  0.245  1.0
  O  O19  1  0.113  0.249  0.025  1.0
  O  O20  1  0.887  0.751  0.975  1.0
  O  O21  1  0.881  0.781  0.624  1.0
  O  O22  1  0.461  0.247  0.973  1.0
  O  O23  1  0.431  0.297  0.271  1.0
  O  O24  1  0.269  0.052  0.665  1.0
  O  O25  1  0.669  0.419  0.839  1.0
  O  O26  1  0.119  0.219  0.376  1.0
  O  O27  1  0.539  0.753  0.027  1.0
[/CIF]
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The compound described by Rb2MoO2As2O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(8), and two equivalent O(1) atoms. In the second Rb site, Rb(2) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(4), one O(8), one O(9), and two equivalent O(7) atoms. Mo(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(9) atom to form distorted MoO6 octahedra that share corners with two equivalent As(1)O4 tetrahedra and corners with two equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(5), one O(6), one O(7), and one O(9) atom to form AsO4 tetrahedra that share corners with two equivalent Mo(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-55°. In the second As site, As(2) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form AsO4 tetrahedra that share corners with two equivalent Mo(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-55°. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Rb(2), two equivalent Rb(1), and one Mo(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Rb(1), one Mo(1), and one As(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one Mo(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Rb(1), one Rb(2), one Mo(1), and one As(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Rb(1), one Mo(1), and one As(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the seventh O site, O(7) is bonded in a 1-coordinate geometry to two equivalent Rb(2) and one As(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Rb(1), one Rb(2), and one As(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Rb(2), one Mo(1), and one As(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Rb2MoAs2O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.666
_cell_length_b   7.794
_cell_length_c   9.233
_cell_angle_alpha   109.831
_cell_angle_beta   102.365
_cell_angle_gamma   87.985
_symmetry_Int_Tables_number   1
_cell_volume   506.462
_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  0.916  0.253  0.635  1.0
  Rb  Rb1  1  0.190  0.831  0.881  1.0
  Rb  Rb2  1  0.084  0.747  0.365  1.0
  Rb  Rb3  1  0.810  0.169  0.119  1.0
  Mo  Mo4  1  0.426  0.237  0.745  1.0
  Mo  Mo5  1  0.574  0.763  0.255  1.0
  As  As6  1  0.317  0.348  0.098  1.0
  As  As7  1  0.683  0.652  0.902  1.0
  As  As8  1  0.672  0.836  0.642  1.0
  As  As9  1  0.328  0.164  0.358  1.0
  O  O10  1  0.731  0.948  0.335  1.0
  O  O11  1  0.483  0.222  0.537  1.0
  O  O12  1  0.287  0.422  0.767  1.0
  O  O13  1  0.713  0.578  0.233  1.0
  O  O14  1  0.655  0.060  0.755  1.0
  O  O15  1  0.331  0.581  0.161  1.0
  O  O16  1  0.517  0.778  0.463  1.0
  O  O17  1  0.569  0.703  0.729  1.0
  O  O18  1  0.345  0.940  0.245  1.0
  O  O19  1  0.113  0.249  0.025  1.0
  O  O20  1  0.887  0.751  0.975  1.0
  O  O21  1  0.881  0.781  0.624  1.0
  O  O22  1  0.461  0.247  0.973  1.0
  O  O23  1  0.431  0.297  0.271  1.0
  O  O24  1  0.269  0.052  0.665  1.0
  O  O25  1  0.669  0.419  0.839  1.0
  O  O26  1  0.119  0.219  0.376  1.0
  O  O27  1  0.539  0.753  0.027  1.0
[/CIF]
.