The structure described by NaLiSi2H4O7 crystallizes in the monoclinic C2/c space group. Na(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form distorted NaO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, and  an edgeedge with one Li(1)O4 tetrahedra. Li(1) is bonded to four equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra, and edges with two equivalent Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Li(1), and one Si(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a distorted water-like geometry to two equivalent Na(1), one H(1), and one H(2) atom. is represented by the CIF card [CIF]
data_NaLiSi2H4O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.412
_cell_length_b   8.412
_cell_length_c   5.126
_cell_angle_alpha   84.223
_cell_angle_beta   84.223
_cell_angle_gamma   60.059
_symmetry_Int_Tables_number   1
_cell_volume   312.126
_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  0.146  0.854  0.250  1.0
  Na  Na1  1  0.854  0.146  0.750  1.0
  Li  Li2  1  0.510  0.490  0.250  1.0
  Li  Li3  1  0.490  0.510  0.750  1.0
  Si  Si4  1  0.784  0.589  0.446  1.0
  Si  Si5  1  0.411  0.216  0.054  1.0
  Si  Si6  1  0.216  0.411  0.554  1.0
  Si  Si7  1  0.589  0.784  0.946  1.0
  H  H8  1  0.748  0.949  0.475  1.0
  H  H9  1  0.051  0.252  0.025  1.0
  H  H10  1  0.252  0.051  0.525  1.0
  H  H11  1  0.949  0.748  0.975  1.0
  H  H12  1  0.721  0.112  0.270  1.0
  H  H13  1  0.888  0.279  0.230  1.0
  H  H14  1  0.279  0.888  0.730  1.0
  H  H15  1  0.112  0.721  0.770  1.0
  O  O16  1  0.706  0.448  0.488  1.0
  O  O17  1  0.552  0.294  0.012  1.0
  O  O18  1  0.294  0.552  0.512  1.0
  O  O19  1  0.448  0.706  0.988  1.0
  O  O20  1  0.766  0.675  0.138  1.0
  O  O21  1  0.325  0.234  0.362  1.0
  O  O22  1  0.234  0.325  0.862  1.0
  O  O23  1  0.675  0.766  0.638  1.0
  O  O24  1  0.000  0.500  0.500  1.0
  O  O25  1  0.500  0.000  0.000  1.0
  O  O26  1  0.805  0.022  0.401  1.0
  O  O27  1  0.978  0.195  0.099  1.0
  O  O28  1  0.195  0.978  0.599  1.0
  O  O29  1  0.022  0.805  0.901  1.0
[/CIF]
.
The structure described by NaLiSi2H4O7 crystallizes in the monoclinic C2/c space group. Na(1) is bonded to two equivalent O(1) and four equivalent O(4) atoms to form distorted NaO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Na(1)O6 octahedra, and  an edgeedge with one Li(1)O4 tetrahedra. Li(1) is bonded to four equivalent O(1) atoms to form LiO4 tetrahedra that share corners with two equivalent Na(1)O6 octahedra, corners with four equivalent Si(1)O4 tetrahedra,  an edgeedge with one Na(1)O6 octahedra, and edges with two equivalent Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 63°. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 octahedra, corners with two equivalent Li(1)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 55°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Li(1), and one Si(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a distorted water-like geometry to two equivalent Na(1), one H(1), and one H(2) atom. is represented by the CIF card [CIF]
data_NaLiSi2H4O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.412
_cell_length_b   8.412
_cell_length_c   5.126
_cell_angle_alpha   84.223
_cell_angle_beta   84.223
_cell_angle_gamma   60.059
_symmetry_Int_Tables_number   1
_cell_volume   312.126
_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  0.146  0.854  0.250  1.0
  Na  Na1  1  0.854  0.146  0.750  1.0
  Li  Li2  1  0.510  0.490  0.250  1.0
  Li  Li3  1  0.490  0.510  0.750  1.0
  Si  Si4  1  0.784  0.589  0.446  1.0
  Si  Si5  1  0.411  0.216  0.054  1.0
  Si  Si6  1  0.216  0.411  0.554  1.0
  Si  Si7  1  0.589  0.784  0.946  1.0
  H  H8  1  0.748  0.949  0.475  1.0
  H  H9  1  0.051  0.252  0.025  1.0
  H  H10  1  0.252  0.051  0.525  1.0
  H  H11  1  0.949  0.748  0.975  1.0
  H  H12  1  0.721  0.112  0.270  1.0
  H  H13  1  0.888  0.279  0.230  1.0
  H  H14  1  0.279  0.888  0.730  1.0
  H  H15  1  0.112  0.721  0.770  1.0
  O  O16  1  0.706  0.448  0.488  1.0
  O  O17  1  0.552  0.294  0.012  1.0
  O  O18  1  0.294  0.552  0.512  1.0
  O  O19  1  0.448  0.706  0.988  1.0
  O  O20  1  0.766  0.675  0.138  1.0
  O  O21  1  0.325  0.234  0.362  1.0
  O  O22  1  0.234  0.325  0.862  1.0
  O  O23  1  0.675  0.766  0.638  1.0
  O  O24  1  0.000  0.500  0.500  1.0
  O  O25  1  0.500  0.000  0.000  1.0
  O  O26  1  0.805  0.022  0.401  1.0
  O  O27  1  0.978  0.195  0.099  1.0
  O  O28  1  0.195  0.978  0.599  1.0
  O  O29  1  0.022  0.805  0.901  1.0
[/CIF]
.