The material structure described by Na2SnGe2(HO4)2 crystallizes in the triclinic P-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(4), one O(6), one O(8), and two equivalent O(7) atoms. In the second Na site, Na(2) 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. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form SnO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra and corners with four equivalent Ge(2)O4 tetrahedra. In the second Sn site, Sn(2) is bonded to two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms to form SnO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-58°. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-54°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(2), one Sn(1), and one Ge(2) atom to form distorted ONa2SnGe tetrahedra that share  a cornercorner with one O(1)Na2SnGe tetrahedra, corners with three equivalent O(4)Na2Ge2 trigonal pyramids, and  an edgeedge with one O(1)Na2SnGe tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sn(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(2), one Ge(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded to one Na(1), one Na(2), one Ge(1), and one Ge(2) atom to form distorted corner-sharing ONa2Ge2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sn(1), and one Ge(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Sn(2), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Na(1), one Sn(2), and one H(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), one Sn(2), and one H(2) atom. is represented by the CIF file [CIF]
data_Na2SnGe2(HO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.678
_cell_length_b   5.951
_cell_length_c   11.475
_cell_angle_alpha   87.620
_cell_angle_beta   80.506
_cell_angle_gamma   75.492
_symmetry_Int_Tables_number   1
_cell_volume   370.218
_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  0.782  0.388  0.564  1.0
  Na  Na1  1  0.218  0.612  0.436  1.0
  Na  Na2  1  0.498  0.181  0.853  1.0
  Na  Na3  1  0.502  0.819  0.147  1.0
  Sn  Sn4  1  0.000  0.000  0.000  1.0
  Sn  Sn5  1  0.500  0.000  0.500  1.0
  Ge  Ge6  1  0.318  0.724  0.749  1.0
  Ge  Ge7  1  0.682  0.276  0.251  1.0
  Ge  Ge8  1  0.829  0.562  0.871  1.0
  Ge  Ge9  1  0.171  0.438  0.129  1.0
  H  H10  1  0.208  0.310  0.637  1.0
  H  H11  1  0.792  0.690  0.363  1.0
  H  H12  1  0.779  0.919  0.656  1.0
  H  H13  1  0.221  0.081  0.344  1.0
  O  O14  1  0.750  0.830  0.945  1.0
  O  O15  1  0.250  0.170  0.055  1.0
  O  O16  1  0.782  0.321  0.956  1.0
  O  O17  1  0.218  0.679  0.044  1.0
  O  O18  1  0.140  0.509  0.791  1.0
  O  O19  1  0.860  0.491  0.209  1.0
  O  O20  1  0.631  0.569  0.762  1.0
  O  O21  1  0.369  0.431  0.238  1.0
  O  O22  1  0.204  0.976  0.834  1.0
  O  O23  1  0.796  0.024  0.166  1.0
  O  O24  1  0.323  0.762  0.597  1.0
  O  O25  1  0.677  0.238  0.403  1.0
  O  O26  1  0.204  0.277  0.555  1.0
  O  O27  1  0.796  0.723  0.445  1.0
  O  O28  1  0.649  0.058  0.648  1.0
  O  O29  1  0.351  0.942  0.352  1.0
[/CIF]
.
The material structure described by Na2SnGe2(HO4)2 crystallizes in the triclinic P-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(4), one O(6), one O(8), and two equivalent O(7) atoms. In the second Na site, Na(2) 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. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form SnO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra and corners with four equivalent Ge(2)O4 tetrahedra. In the second Sn site, Sn(2) is bonded to two equivalent O(6), two equivalent O(7), and two equivalent O(8) atoms to form SnO6 octahedra that share corners with two equivalent Ge(1)O4 tetrahedra. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form GeO4 tetrahedra that share  a cornercorner with one Sn(1)O6 octahedra,  a cornercorner with one Sn(2)O6 octahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-58°. In the second Ge site, Ge(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-54°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Na(2), one Sn(1), and one Ge(2) atom to form distorted ONa2SnGe tetrahedra that share  a cornercorner with one O(1)Na2SnGe tetrahedra, corners with three equivalent O(4)Na2Ge2 trigonal pyramids, and  an edgeedge with one O(1)Na2SnGe tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sn(1), and one Ge(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Na(2), one Ge(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded to one Na(1), one Na(2), one Ge(1), and one Ge(2) atom to form distorted corner-sharing ONa2Ge2 trigonal pyramids. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Na(2), one Sn(1), and one Ge(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Na(1), one Sn(2), and one Ge(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to two equivalent Na(1), one Sn(2), and one H(1) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), one Sn(2), and one H(2) atom. is represented by the CIF file [CIF]
data_Na2SnGe2(HO4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.678
_cell_length_b   5.951
_cell_length_c   11.475
_cell_angle_alpha   87.620
_cell_angle_beta   80.506
_cell_angle_gamma   75.492
_symmetry_Int_Tables_number   1
_cell_volume   370.218
_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  0.782  0.388  0.564  1.0
  Na  Na1  1  0.218  0.612  0.436  1.0
  Na  Na2  1  0.498  0.181  0.853  1.0
  Na  Na3  1  0.502  0.819  0.147  1.0
  Sn  Sn4  1  0.000  0.000  0.000  1.0
  Sn  Sn5  1  0.500  0.000  0.500  1.0
  Ge  Ge6  1  0.318  0.724  0.749  1.0
  Ge  Ge7  1  0.682  0.276  0.251  1.0
  Ge  Ge8  1  0.829  0.562  0.871  1.0
  Ge  Ge9  1  0.171  0.438  0.129  1.0
  H  H10  1  0.208  0.310  0.637  1.0
  H  H11  1  0.792  0.690  0.363  1.0
  H  H12  1  0.779  0.919  0.656  1.0
  H  H13  1  0.221  0.081  0.344  1.0
  O  O14  1  0.750  0.830  0.945  1.0
  O  O15  1  0.250  0.170  0.055  1.0
  O  O16  1  0.782  0.321  0.956  1.0
  O  O17  1  0.218  0.679  0.044  1.0
  O  O18  1  0.140  0.509  0.791  1.0
  O  O19  1  0.860  0.491  0.209  1.0
  O  O20  1  0.631  0.569  0.762  1.0
  O  O21  1  0.369  0.431  0.238  1.0
  O  O22  1  0.204  0.976  0.834  1.0
  O  O23  1  0.796  0.024  0.166  1.0
  O  O24  1  0.323  0.762  0.597  1.0
  O  O25  1  0.677  0.238  0.403  1.0
  O  O26  1  0.204  0.277  0.555  1.0
  O  O27  1  0.796  0.723  0.445  1.0
  O  O28  1  0.649  0.058  0.648  1.0
  O  O29  1  0.351  0.942  0.352  1.0
[/CIF]
.