The compound described by CH2O is Indium-like structured and crystallizes in the trigonal R3c space group. The structure is zero-dimensional and consists of six 1,3,5-trioxane molecules. C(1) is bonded to one H(1), one H(2), and two equivalent O(1) atoms to form corner-sharing CH2O2 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. O(1) is bonded in a water-like geometry to two equivalent C(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_H2CO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.168
_cell_length_b   6.168
_cell_length_c   6.168
_cell_angle_alpha   100.991
_cell_angle_beta   100.991
_cell_angle_gamma   100.991
_symmetry_Int_Tables_number   1
_cell_volume   219.722
_cell_formula_units_Z   6
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
  H  H0  1  0.242  0.734  0.449  1.0
  H  H1  1  0.734  0.449  0.242  1.0
  H  H2  1  0.449  0.242  0.734  1.0
  H  H3  1  0.949  0.234  0.742  1.0
  H  H4  1  0.234  0.742  0.949  1.0
  H  H5  1  0.742  0.949  0.234  1.0
  H  H6  1  0.523  0.806  0.643  1.0
  H  H7  1  0.806  0.643  0.523  1.0
  H  H8  1  0.023  0.143  0.306  1.0
  H  H9  1  0.143  0.306  0.023  1.0
  H  H10  1  0.306  0.023  0.143  1.0
  H  H11  1  0.643  0.523  0.806  1.0
  C  C12  1  0.892  0.011  0.173  1.0
  C  C13  1  0.673  0.511  0.392  1.0
  C  C14  1  0.511  0.392  0.673  1.0
  C  C15  1  0.011  0.173  0.892  1.0
  C  C16  1  0.173  0.892  0.011  1.0
  C  C17  1  0.392  0.673  0.511  1.0
  O  O18  1  0.320  0.484  0.604  1.0
  O  O19  1  0.484  0.604  0.320  1.0
  O  O20  1  0.604  0.320  0.484  1.0
  O  O21  1  0.104  0.984  0.820  1.0
  O  O22  1  0.984  0.820  0.104  1.0
  O  O23  1  0.820  0.104  0.984  1.0
[/CIF]
.
The compound described by CH2O is Indium-like structured and crystallizes in the trigonal R3c space group. The structure is zero-dimensional and consists of six 1,3,5-trioxane molecules. C(1) is bonded to one H(1), one H(2), and two equivalent O(1) atoms to form corner-sharing CH2O2 tetrahedra. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. O(1) is bonded in a water-like geometry to two equivalent C(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_H2CO
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.168
_cell_length_b   6.168
_cell_length_c   6.168
_cell_angle_alpha   100.991
_cell_angle_beta   100.991
_cell_angle_gamma   100.991
_symmetry_Int_Tables_number   1
_cell_volume   219.722
_cell_formula_units_Z   6
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
  H  H0  1  0.242  0.734  0.449  1.0
  H  H1  1  0.734  0.449  0.242  1.0
  H  H2  1  0.449  0.242  0.734  1.0
  H  H3  1  0.949  0.234  0.742  1.0
  H  H4  1  0.234  0.742  0.949  1.0
  H  H5  1  0.742  0.949  0.234  1.0
  H  H6  1  0.523  0.806  0.643  1.0
  H  H7  1  0.806  0.643  0.523  1.0
  H  H8  1  0.023  0.143  0.306  1.0
  H  H9  1  0.143  0.306  0.023  1.0
  H  H10  1  0.306  0.023  0.143  1.0
  H  H11  1  0.643  0.523  0.806  1.0
  C  C12  1  0.892  0.011  0.173  1.0
  C  C13  1  0.673  0.511  0.392  1.0
  C  C14  1  0.511  0.392  0.673  1.0
  C  C15  1  0.011  0.173  0.892  1.0
  C  C16  1  0.173  0.892  0.011  1.0
  C  C17  1  0.392  0.673  0.511  1.0
  O  O18  1  0.320  0.484  0.604  1.0
  O  O19  1  0.484  0.604  0.320  1.0
  O  O20  1  0.604  0.320  0.484  1.0
  O  O21  1  0.104  0.984  0.820  1.0
  O  O22  1  0.984  0.820  0.104  1.0
  O  O23  1  0.820  0.104  0.984  1.0
[/CIF]
.