The structure described by Na2TiSi4H4O13 crystallizes in the tetragonal P42_12 space group. Na(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 pentagonal pyramids that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Ti(1)O5 trigonal bipyramids,  an edgeedge with one Na(1)O6 pentagonal pyramid, and edges with two equivalent Si(1)O4 tetrahedra. Ti(1) is bonded to one O(3) and four equivalent O(2) atoms to form distorted TiO5 trigonal bipyramids that share corners with four equivalent Na(1)O6 pentagonal pyramids and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 pentagonal pyramid, corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid, and  an edgeedge with one Na(1)O6 pentagonal pyramid. H(1) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(3) is bonded in a single-bond geometry to one Ti(1) atom. In the second O site, O(4) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(5) is bonded in a distorted water-like geometry to two equivalent Na(1) and two equivalent H(1) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent Si(1) atoms. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Ti(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Na2TiSi4H4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.430
_cell_length_b   7.430
_cell_length_c   10.866
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   599.836
_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  0.500  0.500  0.170  1.0
  Na  Na1  1  0.000  0.000  0.830  1.0
  Na  Na2  1  0.500  0.500  0.830  1.0
  Na  Na3  1  0.000  0.000  0.170  1.0
  Ti  Ti4  1  0.000  0.500  0.218  1.0
  Ti  Ti5  1  0.500  0.000  0.782  1.0
  Si  Si6  1  0.260  0.818  0.356  1.0
  Si  Si7  1  0.740  0.182  0.356  1.0
  Si  Si8  1  0.760  0.682  0.644  1.0
  Si  Si9  1  0.240  0.318  0.644  1.0
  Si  Si10  1  0.818  0.260  0.644  1.0
  Si  Si11  1  0.182  0.740  0.644  1.0
  Si  Si12  1  0.682  0.760  0.356  1.0
  Si  Si13  1  0.318  0.240  0.356  1.0
  H  H14  1  0.223  0.624  0.010  1.0
  H  H15  1  0.777  0.376  0.010  1.0
  H  H16  1  0.723  0.876  0.990  1.0
  H  H17  1  0.277  0.124  0.990  1.0
  H  H18  1  0.624  0.223  0.990  1.0
  H  H19  1  0.376  0.777  0.990  1.0
  H  H20  1  0.876  0.723  0.010  1.0
  H  H21  1  0.124  0.277  0.010  1.0
  O  O22  1  0.465  0.748  0.326  1.0
  O  O23  1  0.535  0.252  0.326  1.0
  O  O24  1  0.965  0.752  0.674  1.0
  O  O25  1  0.035  0.248  0.674  1.0
  O  O26  1  0.748  0.465  0.674  1.0
  O  O27  1  0.252  0.535  0.674  1.0
  O  O28  1  0.752  0.965  0.326  1.0
  O  O29  1  0.248  0.035  0.326  1.0
  O  O30  1  0.118  0.727  0.263  1.0
  O  O31  1  0.882  0.273  0.263  1.0
  O  O32  1  0.618  0.773  0.737  1.0
  O  O33  1  0.382  0.227  0.737  1.0
  O  O34  1  0.727  0.118  0.737  1.0
  O  O35  1  0.273  0.882  0.737  1.0
  O  O36  1  0.773  0.618  0.263  1.0
  O  O37  1  0.227  0.382  0.263  1.0
  O  O38  1  0.000  0.500  0.057  1.0
  O  O39  1  0.500  0.000  0.943  1.0
  O  O40  1  0.216  0.784  0.500  1.0
  O  O41  1  0.784  0.216  0.500  1.0
  O  O42  1  0.716  0.716  0.500  1.0
  O  O43  1  0.284  0.284  0.500  1.0
  O  O44  1  0.353  0.647  0.000  1.0
  O  O45  1  0.647  0.353  0.000  1.0
  O  O46  1  0.853  0.853  0.000  1.0
  O  O47  1  0.147  0.147  0.000  1.0
[/CIF]
.
The structure described by Na2TiSi4H4O13 crystallizes in the tetragonal P42_12 space group. Na(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form distorted NaO6 pentagonal pyramids that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Ti(1)O5 trigonal bipyramids,  an edgeedge with one Na(1)O6 pentagonal pyramid, and edges with two equivalent Si(1)O4 tetrahedra. Ti(1) is bonded to one O(3) and four equivalent O(2) atoms to form distorted TiO5 trigonal bipyramids that share corners with four equivalent Na(1)O6 pentagonal pyramids and corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form SiO4 tetrahedra that share  a cornercorner with one Na(1)O6 pentagonal pyramid, corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Ti(1)O5 trigonal bipyramid, and  an edgeedge with one Na(1)O6 pentagonal pyramid. H(1) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(3) is bonded in a single-bond geometry to one Ti(1) atom. In the second O site, O(4) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(5) is bonded in a distorted water-like geometry to two equivalent Na(1) and two equivalent H(1) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent Si(1) atoms. In the fifth O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Ti(1), and one Si(1) atom. is represented by the CIF card [CIF]
data_Na2TiSi4H4O13
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.430
_cell_length_b   7.430
_cell_length_c   10.866
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   599.836
_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  0.500  0.500  0.170  1.0
  Na  Na1  1  0.000  0.000  0.830  1.0
  Na  Na2  1  0.500  0.500  0.830  1.0
  Na  Na3  1  0.000  0.000  0.170  1.0
  Ti  Ti4  1  0.000  0.500  0.218  1.0
  Ti  Ti5  1  0.500  0.000  0.782  1.0
  Si  Si6  1  0.260  0.818  0.356  1.0
  Si  Si7  1  0.740  0.182  0.356  1.0
  Si  Si8  1  0.760  0.682  0.644  1.0
  Si  Si9  1  0.240  0.318  0.644  1.0
  Si  Si10  1  0.818  0.260  0.644  1.0
  Si  Si11  1  0.182  0.740  0.644  1.0
  Si  Si12  1  0.682  0.760  0.356  1.0
  Si  Si13  1  0.318  0.240  0.356  1.0
  H  H14  1  0.223  0.624  0.010  1.0
  H  H15  1  0.777  0.376  0.010  1.0
  H  H16  1  0.723  0.876  0.990  1.0
  H  H17  1  0.277  0.124  0.990  1.0
  H  H18  1  0.624  0.223  0.990  1.0
  H  H19  1  0.376  0.777  0.990  1.0
  H  H20  1  0.876  0.723  0.010  1.0
  H  H21  1  0.124  0.277  0.010  1.0
  O  O22  1  0.465  0.748  0.326  1.0
  O  O23  1  0.535  0.252  0.326  1.0
  O  O24  1  0.965  0.752  0.674  1.0
  O  O25  1  0.035  0.248  0.674  1.0
  O  O26  1  0.748  0.465  0.674  1.0
  O  O27  1  0.252  0.535  0.674  1.0
  O  O28  1  0.752  0.965  0.326  1.0
  O  O29  1  0.248  0.035  0.326  1.0
  O  O30  1  0.118  0.727  0.263  1.0
  O  O31  1  0.882  0.273  0.263  1.0
  O  O32  1  0.618  0.773  0.737  1.0
  O  O33  1  0.382  0.227  0.737  1.0
  O  O34  1  0.727  0.118  0.737  1.0
  O  O35  1  0.273  0.882  0.737  1.0
  O  O36  1  0.773  0.618  0.263  1.0
  O  O37  1  0.227  0.382  0.263  1.0
  O  O38  1  0.000  0.500  0.057  1.0
  O  O39  1  0.500  0.000  0.943  1.0
  O  O40  1  0.216  0.784  0.500  1.0
  O  O41  1  0.784  0.216  0.500  1.0
  O  O42  1  0.716  0.716  0.500  1.0
  O  O43  1  0.284  0.284  0.500  1.0
  O  O44  1  0.353  0.647  0.000  1.0
  O  O45  1  0.647  0.353  0.000  1.0
  O  O46  1  0.853  0.853  0.000  1.0
  O  O47  1  0.147  0.147  0.000  1.0
[/CIF]
.