The compound described by V9O20 crystallizes in the triclinic P1 space group. There are nine inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(1), one O(17), one O(19), one O(20), one O(4), and one O(8) atom. In the second V site, V(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(14), one O(18), one O(20), one O(3), and one O(7) atom. In the third V site, V(3) is bonded in a distorted pentagonal planar geometry to one O(1), one O(15), one O(16), one O(19), and one O(3) atom. In the fourth V site, V(4) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(19), one O(5), one O(6), and one O(8) atom. In the fifth V site, V(5) is bonded to one O(10), one O(11), one O(13), one O(17), one O(4), and one O(8) atom to form corner-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 46°. In the sixth V site, V(6) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(14), one O(18), one O(4), one O(7), and one O(9) atom. In the seventh V site, V(7) is bonded in a 5-coordinate geometry to one O(13), one O(15), one O(16), one O(6), and one O(9) atom. In the eighth V site, V(8) is bonded in a 5-coordinate geometry to one O(16), one O(18), one O(2), one O(5), and one O(7) atom. In the ninth V site, V(9) is bonded to one O(12), one O(15), one O(17), one O(19), one O(2), and one O(3) atom to form distorted corner-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one V(1), one V(2), and one V(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(8), one V(9), and one O(5) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one V(2), one V(3), and one V(9) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one V(1), one V(5), and one V(6) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one V(4), one V(8), and one O(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one V(4), one V(7), and one O(9) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one V(2), one V(6), one V(8), and one O(10) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one V(1), one V(4), and one V(5) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one V(6), one V(7), and one O(6) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(5), one V(6), and one O(7) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one V(2), one V(5), one V(6), and one O(14) atom. In the twelfth O site, O(12) is bonded in a water-like geometry to one V(4) and one V(9) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one V(5) and one V(7) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one V(2), one V(6), and one O(11) atom. In the fifteenth O site, O(15) is bonded in a distorted see-saw-like geometry to one V(3), one V(4), one V(7), and one V(9) atom. In the sixteenth O site, O(16) is bonded in a trigonal non-coplanar geometry to one V(3), one V(7), and one V(8) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one V(1), one V(5), one V(9), and one O(20) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal non-coplanar geometry to one V(2), one V(6), and one V(8) atom. In the nineteenth O site, O(19) is bonded in a tetrahedral geometry to one V(1), one V(3), one V(4), and one V(9) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one V(1), one V(2), and one O(17) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.194
_cell_length_b   6.798
_cell_length_c   11.394
_cell_angle_alpha   127.933
_cell_angle_beta   96.441
_cell_angle_gamma   79.208
_symmetry_Int_Tables_number   1
_cell_volume   371.713
_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
  V  V0  1  0.133  0.029  0.590  1.0
  V  V1  1  0.919  0.533  0.539  1.0
  V  V2  1  0.973  0.048  0.848  1.0
  V  V3  1  0.373  0.444  0.869  1.0
  V  V4  1  0.533  0.012  0.464  1.0
  V  V5  1  0.477  0.490  0.383  1.0
  V  V6  1  0.660  0.463  0.117  1.0
  V  V7  1  0.001  0.112  0.183  1.0
  V  V8  1  0.819  0.545  0.840  1.0
  O  O9  1  0.084  0.824  0.638  1.0
  O  O10  1  0.968  0.755  0.046  1.0
  O  O11  1  0.937  0.702  0.774  1.0
  O  O12  1  0.291  0.798  0.414  1.0
  O  O13  1  0.196  0.772  0.023  1.0
  O  O14  1  0.354  0.435  0.092  1.0
  O  O15  1  0.195  0.313  0.375  1.0
  O  O16  1  0.381  0.199  0.654  1.0
  O  O17  1  0.475  0.303  0.152  1.0
  O  O18  1  0.421  0.230  0.405  1.0
  O  O19  1  0.692  0.766  0.504  1.0
  O  O20  1  0.543  0.660  0.857  1.0
  O  O21  1  0.700  0.762  0.270  1.0
  O  O22  1  0.597  0.721  0.597  1.0
  O  O23  1  0.684  0.349  0.912  1.0
  O  O24  1  0.932  0.220  0.060  1.0
  O  O25  1  0.803  0.215  0.608  1.0
  O  O26  1  0.785  0.309  0.335  1.0
  O  O27  1  0.083  0.291  0.820  1.0
  O  O28  1  0.963  0.212  0.519  1.0
[/CIF]
.
The compound described by V9O20 crystallizes in the triclinic P1 space group. There are nine inequivalent V sites. In the first V site, V(1) is bonded in a 6-coordinate geometry to one O(1), one O(17), one O(19), one O(20), one O(4), and one O(8) atom. In the second V site, V(2) is bonded in a 7-coordinate geometry to one O(1), one O(11), one O(14), one O(18), one O(20), one O(3), and one O(7) atom. In the third V site, V(3) is bonded in a distorted pentagonal planar geometry to one O(1), one O(15), one O(16), one O(19), and one O(3) atom. In the fourth V site, V(4) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(19), one O(5), one O(6), and one O(8) atom. In the fifth V site, V(5) is bonded to one O(10), one O(11), one O(13), one O(17), one O(4), and one O(8) atom to form corner-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 46°. In the sixth V site, V(6) is bonded in a 7-coordinate geometry to one O(10), one O(11), one O(14), one O(18), one O(4), one O(7), and one O(9) atom. In the seventh V site, V(7) is bonded in a 5-coordinate geometry to one O(13), one O(15), one O(16), one O(6), and one O(9) atom. In the eighth V site, V(8) is bonded in a 5-coordinate geometry to one O(16), one O(18), one O(2), one O(5), and one O(7) atom. In the ninth V site, V(9) is bonded to one O(12), one O(15), one O(17), one O(19), one O(2), and one O(3) atom to form distorted corner-sharing VO6 octahedra. The corner-sharing octahedral tilt angles are 46°. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one V(1), one V(2), and one V(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(8), one V(9), and one O(5) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one V(2), one V(3), and one V(9) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one V(1), one V(5), and one V(6) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one V(4), one V(8), and one O(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one V(4), one V(7), and one O(9) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one V(2), one V(6), one V(8), and one O(10) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one V(1), one V(4), and one V(5) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one V(6), one V(7), and one O(6) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one V(5), one V(6), and one O(7) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one V(2), one V(5), one V(6), and one O(14) atom. In the twelfth O site, O(12) is bonded in a water-like geometry to one V(4) and one V(9) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one V(5) and one V(7) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one V(2), one V(6), and one O(11) atom. In the fifteenth O site, O(15) is bonded in a distorted see-saw-like geometry to one V(3), one V(4), one V(7), and one V(9) atom. In the sixteenth O site, O(16) is bonded in a trigonal non-coplanar geometry to one V(3), one V(7), and one V(8) atom. In the seventeenth O site, O(17) is bonded in a 4-coordinate geometry to one V(1), one V(5), one V(9), and one O(20) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal non-coplanar geometry to one V(2), one V(6), and one V(8) atom. In the nineteenth O site, O(19) is bonded in a tetrahedral geometry to one V(1), one V(3), one V(4), and one V(9) atom. In the twentieth O site, O(20) is bonded in a 3-coordinate geometry to one V(1), one V(2), and one O(17) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_V9O20
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.194
_cell_length_b   6.798
_cell_length_c   11.394
_cell_angle_alpha   127.933
_cell_angle_beta   96.441
_cell_angle_gamma   79.208
_symmetry_Int_Tables_number   1
_cell_volume   371.713
_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
  V  V0  1  0.133  0.029  0.590  1.0
  V  V1  1  0.919  0.533  0.539  1.0
  V  V2  1  0.973  0.048  0.848  1.0
  V  V3  1  0.373  0.444  0.869  1.0
  V  V4  1  0.533  0.012  0.464  1.0
  V  V5  1  0.477  0.490  0.383  1.0
  V  V6  1  0.660  0.463  0.117  1.0
  V  V7  1  0.001  0.112  0.183  1.0
  V  V8  1  0.819  0.545  0.840  1.0
  O  O9  1  0.084  0.824  0.638  1.0
  O  O10  1  0.968  0.755  0.046  1.0
  O  O11  1  0.937  0.702  0.774  1.0
  O  O12  1  0.291  0.798  0.414  1.0
  O  O13  1  0.196  0.772  0.023  1.0
  O  O14  1  0.354  0.435  0.092  1.0
  O  O15  1  0.195  0.313  0.375  1.0
  O  O16  1  0.381  0.199  0.654  1.0
  O  O17  1  0.475  0.303  0.152  1.0
  O  O18  1  0.421  0.230  0.405  1.0
  O  O19  1  0.692  0.766  0.504  1.0
  O  O20  1  0.543  0.660  0.857  1.0
  O  O21  1  0.700  0.762  0.270  1.0
  O  O22  1  0.597  0.721  0.597  1.0
  O  O23  1  0.684  0.349  0.912  1.0
  O  O24  1  0.932  0.220  0.060  1.0
  O  O25  1  0.803  0.215  0.608  1.0
  O  O26  1  0.785  0.309  0.335  1.0
  O  O27  1  0.083  0.291  0.820  1.0
  O  O28  1  0.963  0.212  0.519  1.0
[/CIF]
.