The structure described by Na2GeO9 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(6), one O(9), and two equivalent O(8) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(2), one O(4), and two equivalent O(3) atoms. Ge(1) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(3), one O(4), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Na(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(2), one Ge(1), and one O(5) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to two equivalent Na(2) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Ge(1), and one O(9) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(8) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Na(1) and one O(7) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one O(6) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one O(5) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Ge(1), and one O(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2GeO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.106
_cell_length_b   6.538
_cell_length_c   11.537
_cell_angle_alpha   85.484
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   383.883
_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
  Na  Na0  1  0.051  0.125  0.607  1.0
  Na  Na1  1  0.551  0.875  0.393  1.0
  Na  Na2  1  0.171  0.626  0.917  1.0
  Na  Na3  1  0.671  0.374  0.083  1.0
  Ge  Ge4  1  0.430  0.193  0.827  1.0
  Ge  Ge5  1  0.930  0.807  0.173  1.0
  O  O6  1  0.405  0.292  0.685  1.0
  O  O7  1  0.905  0.708  0.315  1.0
  O  O8  1  0.449  0.895  0.817  1.0
  O  O9  1  0.949  0.105  0.183  1.0
  O  O10  1  0.369  0.311  0.950  1.0
  O  O11  1  0.869  0.689  0.050  1.0
  O  O12  1  0.829  0.208  0.866  1.0
  O  O13  1  0.329  0.792  0.134  1.0
  O  O14  1  0.601  0.851  0.712  1.0
  O  O15  1  0.101  0.149  0.288  1.0
  O  O16  1  0.709  0.382  0.495  1.0
  O  O17  1  0.209  0.618  0.505  1.0
  O  O18  1  0.066  0.654  0.587  1.0
  O  O19  1  0.566  0.346  0.413  1.0
  O  O20  1  0.482  0.916  0.615  1.0
  O  O21  1  0.982  0.084  0.385  1.0
  O  O22  1  0.000  0.096  0.811  1.0
  O  O23  1  0.500  0.904  0.189  1.0
[/CIF]
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The structure described by Na2GeO9 crystallizes in the monoclinic P2_1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 5-coordinate geometry to one O(1), one O(6), one O(9), and two equivalent O(8) atoms. In the second Na site, Na(2) is bonded in a 4-coordinate geometry to one O(2), one O(4), and two equivalent O(3) atoms. Ge(1) is bonded in a distorted trigonal bipyramidal geometry to one O(1), one O(2), one O(3), one O(4), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Na(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(2), one Ge(1), and one O(5) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to two equivalent Na(2) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(2), one Ge(1), and one O(9) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(8) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Na(1) and one O(7) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one O(6) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to two equivalent Na(1) and one O(5) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Na(1), one Ge(1), and one O(4) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2GeO9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.106
_cell_length_b   6.538
_cell_length_c   11.537
_cell_angle_alpha   85.484
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   383.883
_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
  Na  Na0  1  0.051  0.125  0.607  1.0
  Na  Na1  1  0.551  0.875  0.393  1.0
  Na  Na2  1  0.171  0.626  0.917  1.0
  Na  Na3  1  0.671  0.374  0.083  1.0
  Ge  Ge4  1  0.430  0.193  0.827  1.0
  Ge  Ge5  1  0.930  0.807  0.173  1.0
  O  O6  1  0.405  0.292  0.685  1.0
  O  O7  1  0.905  0.708  0.315  1.0
  O  O8  1  0.449  0.895  0.817  1.0
  O  O9  1  0.949  0.105  0.183  1.0
  O  O10  1  0.369  0.311  0.950  1.0
  O  O11  1  0.869  0.689  0.050  1.0
  O  O12  1  0.829  0.208  0.866  1.0
  O  O13  1  0.329  0.792  0.134  1.0
  O  O14  1  0.601  0.851  0.712  1.0
  O  O15  1  0.101  0.149  0.288  1.0
  O  O16  1  0.709  0.382  0.495  1.0
  O  O17  1  0.209  0.618  0.505  1.0
  O  O18  1  0.066  0.654  0.587  1.0
  O  O19  1  0.566  0.346  0.413  1.0
  O  O20  1  0.482  0.916  0.615  1.0
  O  O21  1  0.982  0.084  0.385  1.0
  O  O22  1  0.000  0.096  0.811  1.0
  O  O23  1  0.500  0.904  0.189  1.0
[/CIF]
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