data_AgC2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.24
_cell_length_b   5.24
_cell_length_c   5.24
_cell_angle_alpha   152.24
_cell_angle_beta   152.24
_cell_angle_gamma   39.67
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AgC2
_chemical_formula_sum   'Ag1 C2'
_cell_volume   31.16
_cell_formula_units_Z   1
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
  Ag  Ag0  1  0.0  0.0  0.0  1.0
  C  C1  1  0.0  0.0  0.39  1.0
  C  C2  1  0.0  0.0  0.47  1.0

data_AgC2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.56
_cell_length_b   3.56
_cell_length_c   5.24
_cell_angle_alpha   90.0
_cell_angle_beta   109.83
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   AgC2
_chemical_formula_sum   'Ag2 C4'
_cell_volume   62.32
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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
  Ag  Ag0  2  0.0  0.0  0.0  1.0
  C  C1  2  0.39  0.0  0.39  1.0
  C  C2  2  0.47  0.0  0.47  1.0

Ag C C
C2Ag crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two silver acetylide (dry) [forbidden] molecules. Ag(1) is bonded in a distorted single-bond geometry to one C(1) atom. The Ag(1)-C(1) bond length is 2.02 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted linear geometry to one Ag(1) and one C(2) atom. The C(1)-C(2) bond length is 0.46 Å. In the second C site, C(2) is bonded in a single-bond geometry to one C(1) atom.