The compound described by K2Mo4O13 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(11), one O(7), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(9), and two equivalent O(3) atoms. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a 3-coordinate geometry to one O(12), one O(5), one O(8), and one O(9) atom. In the second Mo site, Mo(2) is bonded in a 2-coordinate geometry to one O(1), one O(13), one O(2), and one O(4) atom. In the third Mo site, Mo(3) is bonded in a 3-coordinate geometry to one O(11), one O(2), one O(3), and one O(7) atom. In the fourth Mo site, Mo(4) is bonded in a 2-coordinate geometry to one O(10), one O(12), one O(6), and one O(7) atom. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(2) and one Mo(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mo(2) and one Mo(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent K(2) and one Mo(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Mo(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Mo(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Mo(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Mo(3), and one Mo(4) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Mo(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(2) and one Mo(1) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one K(2) and one Mo(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Mo(3) atom. In the twelfth O site, O(12) is bonded in an L-shaped geometry to one Mo(1) and one Mo(4) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one K(2) and one Mo(2) atom. is represented by the CIF file [CIF]
data_K2Mo4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.249
_cell_length_b   8.534
_cell_length_c   10.333
_cell_angle_alpha   107.368
_cell_angle_beta   103.101
_cell_angle_gamma   109.504
_symmetry_Int_Tables_number   1
_cell_volume   609.799
_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
  K  K0  1  0.311  0.351  0.430  1.0
  K  K1  1  0.689  0.649  0.570  1.0
  K  K2  1  0.376  0.926  0.309  1.0
  K  K3  1  0.624  0.074  0.691  1.0
  Mo  Mo4  1  0.765  0.456  0.051  1.0
  Mo  Mo5  1  0.235  0.544  0.949  1.0
  Mo  Mo6  1  0.769  0.846  0.062  1.0
  Mo  Mo7  1  0.231  0.154  0.938  1.0
  Mo  Mo8  1  0.048  0.875  0.731  1.0
  Mo  Mo9  1  0.952  0.125  0.269  1.0
  Mo  Mo10  1  0.065  0.494  0.710  1.0
  Mo  Mo11  1  0.935  0.506  0.290  1.0
  O  O12  1  0.695  0.978  0.962  1.0
  O  O13  1  0.305  0.022  0.038  1.0
  O  O14  1  0.068  0.980  0.883  1.0
  O  O15  1  0.932  0.020  0.117  1.0
  O  O16  1  0.286  0.007  0.611  1.0
  O  O17  1  0.714  0.993  0.389  1.0
  O  O18  1  0.769  0.690  0.946  1.0
  O  O19  1  0.231  0.310  0.054  1.0
  O  O20  1  0.535  0.327  0.183  1.0
  O  O21  1  0.465  0.673  0.817  1.0
  O  O22  1  0.296  0.615  0.571  1.0
  O  O23  1  0.704  0.385  0.429  1.0
  O  O24  1  0.978  0.682  0.664  1.0
  O  O25  1  0.022  0.318  0.336  1.0
  O  O26  1  0.878  0.639  0.145  1.0
  O  O27  1  0.122  0.361  0.855  1.0
  O  O28  1  0.775  0.376  0.909  1.0
  O  O29  1  0.225  0.624  0.091  1.0
  O  O30  1  0.952  0.339  0.647  1.0
  O  O31  1  0.048  0.661  0.353  1.0
  O  O32  1  0.933  0.985  0.659  1.0
  O  O33  1  0.067  0.015  0.341  1.0
  O  O34  1  0.098  0.650  0.864  1.0
  O  O35  1  0.902  0.350  0.136  1.0
  O  O36  1  0.571  0.716  0.228  1.0
  O  O37  1  0.429  0.284  0.772  1.0
[/CIF]
.
The compound described by K2Mo4O13 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 3-coordinate geometry to one O(11), one O(7), and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(13), one O(9), and two equivalent O(3) atoms. There are four inequivalent Mo sites. In the first Mo site, Mo(1) is bonded in a 3-coordinate geometry to one O(12), one O(5), one O(8), and one O(9) atom. In the second Mo site, Mo(2) is bonded in a 2-coordinate geometry to one O(1), one O(13), one O(2), and one O(4) atom. In the third Mo site, Mo(3) is bonded in a 3-coordinate geometry to one O(11), one O(2), one O(3), and one O(7) atom. In the fourth Mo site, Mo(4) is bonded in a 2-coordinate geometry to one O(10), one O(12), one O(6), and one O(7) atom. There are thirteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(2) and one Mo(2) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mo(2) and one Mo(3) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent K(2) and one Mo(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Mo(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Mo(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent K(1) and one Mo(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Mo(3), and one Mo(4) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Mo(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(2) and one Mo(1) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one K(2) and one Mo(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one K(1), one K(2), and one Mo(3) atom. In the twelfth O site, O(12) is bonded in an L-shaped geometry to one Mo(1) and one Mo(4) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one K(2) and one Mo(2) atom. is represented by the CIF file [CIF]
data_K2Mo4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.249
_cell_length_b   8.534
_cell_length_c   10.333
_cell_angle_alpha   107.368
_cell_angle_beta   103.101
_cell_angle_gamma   109.504
_symmetry_Int_Tables_number   1
_cell_volume   609.799
_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
  K  K0  1  0.311  0.351  0.430  1.0
  K  K1  1  0.689  0.649  0.570  1.0
  K  K2  1  0.376  0.926  0.309  1.0
  K  K3  1  0.624  0.074  0.691  1.0
  Mo  Mo4  1  0.765  0.456  0.051  1.0
  Mo  Mo5  1  0.235  0.544  0.949  1.0
  Mo  Mo6  1  0.769  0.846  0.062  1.0
  Mo  Mo7  1  0.231  0.154  0.938  1.0
  Mo  Mo8  1  0.048  0.875  0.731  1.0
  Mo  Mo9  1  0.952  0.125  0.269  1.0
  Mo  Mo10  1  0.065  0.494  0.710  1.0
  Mo  Mo11  1  0.935  0.506  0.290  1.0
  O  O12  1  0.695  0.978  0.962  1.0
  O  O13  1  0.305  0.022  0.038  1.0
  O  O14  1  0.068  0.980  0.883  1.0
  O  O15  1  0.932  0.020  0.117  1.0
  O  O16  1  0.286  0.007  0.611  1.0
  O  O17  1  0.714  0.993  0.389  1.0
  O  O18  1  0.769  0.690  0.946  1.0
  O  O19  1  0.231  0.310  0.054  1.0
  O  O20  1  0.535  0.327  0.183  1.0
  O  O21  1  0.465  0.673  0.817  1.0
  O  O22  1  0.296  0.615  0.571  1.0
  O  O23  1  0.704  0.385  0.429  1.0
  O  O24  1  0.978  0.682  0.664  1.0
  O  O25  1  0.022  0.318  0.336  1.0
  O  O26  1  0.878  0.639  0.145  1.0
  O  O27  1  0.122  0.361  0.855  1.0
  O  O28  1  0.775  0.376  0.909  1.0
  O  O29  1  0.225  0.624  0.091  1.0
  O  O30  1  0.952  0.339  0.647  1.0
  O  O31  1  0.048  0.661  0.353  1.0
  O  O32  1  0.933  0.985  0.659  1.0
  O  O33  1  0.067  0.015  0.341  1.0
  O  O34  1  0.098  0.650  0.864  1.0
  O  O35  1  0.902  0.350  0.136  1.0
  O  O36  1  0.571  0.716  0.228  1.0
  O  O37  1  0.429  0.284  0.772  1.0
[/CIF]
.