The crystal structure described by C4SeO2 is Indium-like structured and crystallizes in the orthorhombic Pnnm space group. The structure is zero-dimensional and consists of two 2,7-diselenatricyclo[6.2.0.03,6]deca-1(8),3(6)-diene-4,5,9,10-tetrone molecules. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one C(1), one C(2), and one Se(1) atom. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one O(1) atom. Se(1) is bonded in an L-shaped geometry to two equivalent C(1) atoms. O(1) is bonded in a single-bond geometry to one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_C4SeO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.461
_cell_length_b   9.128
_cell_length_c   11.709
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   476.735
_cell_formula_units_Z   4
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
  C  C0  1  0.917  0.064  0.882  1.0
  C  C1  1  0.583  0.564  0.618  1.0
  C  C2  1  0.417  0.436  0.618  1.0
  C  C3  1  0.906  0.072  0.246  1.0
  C  C4  1  0.594  0.572  0.254  1.0
  C  C5  1  0.583  0.564  0.382  1.0
  C  C6  1  0.406  0.428  0.746  1.0
  C  C7  1  0.094  0.928  0.754  1.0
  C  C8  1  0.083  0.936  0.118  1.0
  C  C9  1  0.917  0.064  0.118  1.0
  C  C10  1  0.406  0.428  0.254  1.0
  C  C11  1  0.906  0.072  0.754  1.0
  C  C12  1  0.594  0.572  0.746  1.0
  C  C13  1  0.083  0.936  0.882  1.0
  C  C14  1  0.417  0.436  0.382  1.0
  C  C15  1  0.094  0.928  0.246  1.0
  Se  Se16  1  0.237  0.817  0.000  1.0
  Se  Se17  1  0.763  0.183  0.000  1.0
  Se  Se18  1  0.263  0.317  0.500  1.0
  Se  Se19  1  0.737  0.683  0.500  1.0
  O  O20  1  0.703  0.652  0.817  1.0
  O  O21  1  0.797  0.152  0.317  1.0
  O  O22  1  0.297  0.348  0.183  1.0
  O  O23  1  0.703  0.652  0.183  1.0
  O  O24  1  0.203  0.848  0.683  1.0
  O  O25  1  0.203  0.848  0.317  1.0
  O  O26  1  0.797  0.152  0.683  1.0
  O  O27  1  0.297  0.348  0.817  1.0
[/CIF]
.
The crystal structure described by C4SeO2 is Indium-like structured and crystallizes in the orthorhombic Pnnm space group. The structure is zero-dimensional and consists of two 2,7-diselenatricyclo[6.2.0.03,6]deca-1(8),3(6)-diene-4,5,9,10-tetrone molecules. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one C(1), one C(2), and one Se(1) atom. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one O(1) atom. Se(1) is bonded in an L-shaped geometry to two equivalent C(1) atoms. O(1) is bonded in a single-bond geometry to one C(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_C4SeO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.461
_cell_length_b   9.128
_cell_length_c   11.709
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   476.735
_cell_formula_units_Z   4
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
  C  C0  1  0.917  0.064  0.882  1.0
  C  C1  1  0.583  0.564  0.618  1.0
  C  C2  1  0.417  0.436  0.618  1.0
  C  C3  1  0.906  0.072  0.246  1.0
  C  C4  1  0.594  0.572  0.254  1.0
  C  C5  1  0.583  0.564  0.382  1.0
  C  C6  1  0.406  0.428  0.746  1.0
  C  C7  1  0.094  0.928  0.754  1.0
  C  C8  1  0.083  0.936  0.118  1.0
  C  C9  1  0.917  0.064  0.118  1.0
  C  C10  1  0.406  0.428  0.254  1.0
  C  C11  1  0.906  0.072  0.754  1.0
  C  C12  1  0.594  0.572  0.746  1.0
  C  C13  1  0.083  0.936  0.882  1.0
  C  C14  1  0.417  0.436  0.382  1.0
  C  C15  1  0.094  0.928  0.246  1.0
  Se  Se16  1  0.237  0.817  0.000  1.0
  Se  Se17  1  0.763  0.183  0.000  1.0
  Se  Se18  1  0.263  0.317  0.500  1.0
  Se  Se19  1  0.737  0.683  0.500  1.0
  O  O20  1  0.703  0.652  0.817  1.0
  O  O21  1  0.797  0.152  0.317  1.0
  O  O22  1  0.297  0.348  0.183  1.0
  O  O23  1  0.703  0.652  0.183  1.0
  O  O24  1  0.203  0.848  0.683  1.0
  O  O25  1  0.203  0.848  0.317  1.0
  O  O26  1  0.797  0.152  0.683  1.0
  O  O27  1  0.297  0.348  0.817  1.0
[/CIF]
.