The structure described by Na2Ce2TiSi(CO6)2 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(5), one O(7), two equivalent O(11), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(8) atoms to form NaO6 octahedra that share corners with four equivalent Ti(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 66°. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(4), one O(6), and two equivalent O(10) atoms. Ti(1) is bonded to one O(6), one O(8), two equivalent O(12), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. Si(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, and  an edgeedge with one Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-70°. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(3) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(7) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(2), one Ce(1), one Ce(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Ce(1), one Ce(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Na(3), two equivalent Na(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ce(2), two equivalent Ce(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ce(1), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Ce(2), one Ti(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ce(1), and one C(2) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Ce(1), one Ti(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ce(1) and two equivalent Ti(1) atoms. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ce(1), two equivalent Ce(2), and one C(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Ce(2), and one C(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ce(2) and two equivalent Ti(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Ce2TiSi(CO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.069
_cell_length_b   7.622
_cell_length_c   14.069
_cell_angle_alpha   94.148
_cell_angle_beta   100.566
_cell_angle_gamma   109.241
_symmetry_Int_Tables_number   1
_cell_volume   499.299
_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  0.701  0.862  0.527  1.0
  Na  Na1  1  0.500  0.000  0.000  1.0
  Na  Na2  1  0.000  0.500  0.500  1.0
  Na  Na3  1  0.299  0.138  0.473  1.0
  Ce  Ce4  1  0.812  0.343  0.217  1.0
  Ce  Ce5  1  0.474  0.219  0.782  1.0
  Ce  Ce6  1  0.526  0.781  0.218  1.0
  Ce  Ce7  1  0.188  0.657  0.783  1.0
  Ti  Ti8  1  0.802  0.604  0.000  1.0
  Ti  Ti9  1  0.198  0.396  1.000  1.0
  Si  Si10  1  0.951  0.961  0.858  1.0
  Si  Si11  1  0.049  0.039  0.142  1.0
  C  C12  1  0.114  0.792  0.352  1.0
  C  C13  1  0.886  0.208  0.648  1.0
  C  C14  1  0.407  0.399  0.346  1.0
  C  C15  1  0.593  0.601  0.654  1.0
  O  O16  1  0.621  0.957  0.843  1.0
  O  O17  1  0.940  0.067  0.244  1.0
  O  O18  1  0.942  0.809  0.405  1.0
  O  O19  1  0.606  0.544  0.740  1.0
  O  O20  1  0.785  0.599  0.607  1.0
  O  O21  1  0.804  0.838  0.084  1.0
  O  O22  1  0.609  0.334  0.376  1.0
  O  O23  1  0.990  0.209  0.084  1.0
  O  O24  1  0.058  0.191  0.595  1.0
  O  O25  1  0.580  0.447  0.082  1.0
  O  O26  1  0.379  0.043  0.157  1.0
  O  O27  1  0.010  0.693  0.264  1.0
  O  O28  1  0.610  0.129  0.621  1.0
  O  O29  1  0.845  0.402  0.918  1.0
  O  O30  1  0.390  0.871  0.379  1.0
  O  O31  1  0.155  0.598  0.082  1.0
  O  O32  1  0.990  0.307  0.736  1.0
  O  O33  1  0.394  0.456  0.260  1.0
  O  O34  1  0.196  0.162  0.916  1.0
  O  O35  1  0.215  0.401  0.393  1.0
  O  O36  1  0.060  0.933  0.756  1.0
  O  O37  1  0.010  0.791  0.916  1.0
  O  O38  1  0.420  0.553  0.918  1.0
  O  O39  1  0.391  0.666  0.624  1.0
[/CIF]
.
The structure described by Na2Ce2TiSi(CO6)2 crystallizes in the triclinic P-1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 6-coordinate geometry to one O(5), one O(7), two equivalent O(11), and two equivalent O(3) atoms. In the second Na site, Na(2) is bonded to two equivalent O(1), two equivalent O(6), and two equivalent O(8) atoms to form NaO6 octahedra that share corners with four equivalent Ti(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 66°. In the third Na site, Na(3) is bonded in a 6-coordinate geometry to two equivalent O(3), two equivalent O(5), and two equivalent O(7) atoms. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(7), one O(8), one O(9), and two equivalent O(4) atoms. In the second Ce site, Ce(2) is bonded in a 8-coordinate geometry to one O(1), one O(11), one O(12), one O(2), one O(4), one O(6), and two equivalent O(10) atoms. Ti(1) is bonded to one O(6), one O(8), two equivalent O(12), and two equivalent O(9) atoms to form TiO6 octahedra that share corners with two equivalent Na(2)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Ti(1)O6 octahedra. The corner-sharing octahedral tilt angles are 66°. Si(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Na(2)O6 octahedra, corners with two equivalent Ti(1)O6 octahedra, and  an edgeedge with one Na(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-70°. There are two inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(3) atom. In the second C site, C(2) is bonded in a trigonal planar geometry to one O(4), one O(5), and one O(7) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Na(2), one Ce(1), one Ce(2), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Ce(1), one Ce(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one Na(3), two equivalent Na(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Ce(2), two equivalent Ce(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ce(1), and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Ce(2), one Ti(1), and one Si(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Na(1), one Na(3), one Ce(1), and one C(2) atom. In the eighth O site, O(8) is bonded in a distorted rectangular see-saw-like geometry to one Na(2), one Ce(1), one Ti(1), and one Si(1) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Ce(1) and two equivalent Ti(1) atoms. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ce(1), two equivalent Ce(2), and one C(1) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Ce(2), and one C(1) atom. In the twelfth O site, O(12) is bonded in a 3-coordinate geometry to one Ce(2) and two equivalent Ti(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Na2Ce2TiSi(CO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.069
_cell_length_b   7.622
_cell_length_c   14.069
_cell_angle_alpha   94.148
_cell_angle_beta   100.566
_cell_angle_gamma   109.241
_symmetry_Int_Tables_number   1
_cell_volume   499.299
_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  0.701  0.862  0.527  1.0
  Na  Na1  1  0.500  0.000  0.000  1.0
  Na  Na2  1  0.000  0.500  0.500  1.0
  Na  Na3  1  0.299  0.138  0.473  1.0
  Ce  Ce4  1  0.812  0.343  0.217  1.0
  Ce  Ce5  1  0.474  0.219  0.782  1.0
  Ce  Ce6  1  0.526  0.781  0.218  1.0
  Ce  Ce7  1  0.188  0.657  0.783  1.0
  Ti  Ti8  1  0.802  0.604  0.000  1.0
  Ti  Ti9  1  0.198  0.396  1.000  1.0
  Si  Si10  1  0.951  0.961  0.858  1.0
  Si  Si11  1  0.049  0.039  0.142  1.0
  C  C12  1  0.114  0.792  0.352  1.0
  C  C13  1  0.886  0.208  0.648  1.0
  C  C14  1  0.407  0.399  0.346  1.0
  C  C15  1  0.593  0.601  0.654  1.0
  O  O16  1  0.621  0.957  0.843  1.0
  O  O17  1  0.940  0.067  0.244  1.0
  O  O18  1  0.942  0.809  0.405  1.0
  O  O19  1  0.606  0.544  0.740  1.0
  O  O20  1  0.785  0.599  0.607  1.0
  O  O21  1  0.804  0.838  0.084  1.0
  O  O22  1  0.609  0.334  0.376  1.0
  O  O23  1  0.990  0.209  0.084  1.0
  O  O24  1  0.058  0.191  0.595  1.0
  O  O25  1  0.580  0.447  0.082  1.0
  O  O26  1  0.379  0.043  0.157  1.0
  O  O27  1  0.010  0.693  0.264  1.0
  O  O28  1  0.610  0.129  0.621  1.0
  O  O29  1  0.845  0.402  0.918  1.0
  O  O30  1  0.390  0.871  0.379  1.0
  O  O31  1  0.155  0.598  0.082  1.0
  O  O32  1  0.990  0.307  0.736  1.0
  O  O33  1  0.394  0.456  0.260  1.0
  O  O34  1  0.196  0.162  0.916  1.0
  O  O35  1  0.215  0.401  0.393  1.0
  O  O36  1  0.060  0.933  0.756  1.0
  O  O37  1  0.010  0.791  0.916  1.0
  O  O38  1  0.420  0.553  0.918  1.0
  O  O39  1  0.391  0.666  0.624  1.0
[/CIF]
.