The compound described by K2SnC4O9 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(2), one O(7), one O(8), one O(9), and two equivalent O(5) atoms. In the second K site, K(2) is bonded to one O(3), one O(6), one O(9), two equivalent O(1), and two equivalent O(4) atoms to form distorted edge-sharing KO7 pentagonal bipyramids. Sn(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2) and one C(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Sn(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(2), one Sn(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(2), one Sn(1), and one C(3) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one K(1) and one C(4) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one Sn(1), and one C(4) atom. In the ninth O site, O(9) is bonded in an L-shaped geometry to one K(1) and one K(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2SnC4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.554
_cell_length_b   6.594
_cell_length_c   11.896
_cell_angle_alpha   94.437
_cell_angle_beta   92.633
_cell_angle_gamma   102.913
_symmetry_Int_Tables_number   1
_cell_volume   498.605
_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
  K  K0  1  0.481  0.267  0.886  1.0
  K  K1  1  0.519  0.733  0.114  1.0
  K  K2  1  0.758  0.064  0.420  1.0
  K  K3  1  0.242  0.936  0.580  1.0
  Sn  Sn4  1  0.754  0.850  0.771  1.0
  Sn  Sn5  1  0.246  0.150  0.229  1.0
  C  C6  1  0.670  0.417  0.635  1.0
  C  C7  1  0.330  0.583  0.365  1.0
  C  C8  1  0.754  0.565  0.542  1.0
  C  C9  1  0.246  0.435  0.458  1.0
  C  C10  1  0.161  0.776  0.883  1.0
  C  C11  1  0.839  0.224  0.117  1.0
  C  C12  1  0.004  0.745  0.980  1.0
  C  C13  1  0.996  0.255  0.020  1.0
  O  O14  1  0.611  0.225  0.610  1.0
  O  O15  1  0.389  0.775  0.390  1.0
  O  O16  1  0.667  0.508  0.735  1.0
  O  O17  1  0.333  0.492  0.265  1.0
  O  O18  1  0.754  0.485  0.443  1.0
  O  O19  1  0.246  0.515  0.557  1.0
  O  O20  1  0.814  0.760  0.576  1.0
  O  O21  1  0.186  0.240  0.424  1.0
  O  O22  1  0.345  0.761  0.903  1.0
  O  O23  1  0.655  0.239  0.097  1.0
  O  O24  1  0.088  0.827  0.789  1.0
  O  O25  1  0.912  0.173  0.211  1.0
  O  O26  1  0.076  0.727  0.077  1.0
  O  O27  1  0.924  0.273  0.923  1.0
  O  O28  1  0.813  0.751  0.952  1.0
  O  O29  1  0.187  0.249  0.048  1.0
  O  O30  1  0.870  0.747  0.277  1.0
  O  O31  1  0.130  0.253  0.723  1.0
[/CIF]
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The compound described by K2SnC4O9 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to one O(2), one O(7), one O(8), one O(9), and two equivalent O(5) atoms. In the second K site, K(2) is bonded to one O(3), one O(6), one O(9), two equivalent O(1), and two equivalent O(4) atoms to form distorted edge-sharing KO7 pentagonal bipyramids. Sn(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(8) atom. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(2) and one C(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one K(1), one Sn(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(2) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent K(2), one Sn(1), and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent K(1) and one C(3) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(2), one Sn(1), and one C(3) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one K(1) and one C(4) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1), one Sn(1), and one C(4) atom. In the ninth O site, O(9) is bonded in an L-shaped geometry to one K(1) and one K(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_K2SnC4O9
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.554
_cell_length_b   6.594
_cell_length_c   11.896
_cell_angle_alpha   94.437
_cell_angle_beta   92.633
_cell_angle_gamma   102.913
_symmetry_Int_Tables_number   1
_cell_volume   498.605
_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
  K  K0  1  0.481  0.267  0.886  1.0
  K  K1  1  0.519  0.733  0.114  1.0
  K  K2  1  0.758  0.064  0.420  1.0
  K  K3  1  0.242  0.936  0.580  1.0
  Sn  Sn4  1  0.754  0.850  0.771  1.0
  Sn  Sn5  1  0.246  0.150  0.229  1.0
  C  C6  1  0.670  0.417  0.635  1.0
  C  C7  1  0.330  0.583  0.365  1.0
  C  C8  1  0.754  0.565  0.542  1.0
  C  C9  1  0.246  0.435  0.458  1.0
  C  C10  1  0.161  0.776  0.883  1.0
  C  C11  1  0.839  0.224  0.117  1.0
  C  C12  1  0.004  0.745  0.980  1.0
  C  C13  1  0.996  0.255  0.020  1.0
  O  O14  1  0.611  0.225  0.610  1.0
  O  O15  1  0.389  0.775  0.390  1.0
  O  O16  1  0.667  0.508  0.735  1.0
  O  O17  1  0.333  0.492  0.265  1.0
  O  O18  1  0.754  0.485  0.443  1.0
  O  O19  1  0.246  0.515  0.557  1.0
  O  O20  1  0.814  0.760  0.576  1.0
  O  O21  1  0.186  0.240  0.424  1.0
  O  O22  1  0.345  0.761  0.903  1.0
  O  O23  1  0.655  0.239  0.097  1.0
  O  O24  1  0.088  0.827  0.789  1.0
  O  O25  1  0.912  0.173  0.211  1.0
  O  O26  1  0.076  0.727  0.077  1.0
  O  O27  1  0.924  0.273  0.923  1.0
  O  O28  1  0.813  0.751  0.952  1.0
  O  O29  1  0.187  0.249  0.048  1.0
  O  O30  1  0.870  0.747  0.277  1.0
  O  O31  1  0.130  0.253  0.723  1.0
[/CIF]
.