data_Ag2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.0
_cell_length_b   4.0
_cell_length_c   4.0
_cell_angle_alpha   60.0
_cell_angle_beta   60.0
_cell_angle_gamma   60.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Ag2C
_chemical_formula_sum   'Ag2 C1'
_cell_volume   45.34
_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  0.42  0.42  0.42  1.0
  Ag  Ag1  1  0.25  0.25  0.25  1.0
  C  C2  1  0.0  0.0  0.0  1.0

data_Ag2C
_symmetry_space_group_name_H-M   R3m
_cell_length_a   4.0
_cell_length_b   4.0
_cell_length_c   9.8
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   160
_chemical_formula_structural   Ag2C
_chemical_formula_sum   'Ag6 C3'
_cell_volume   136.03
_cell_formula_units_Z   3
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-y, x-y, z'
  3  '-x+y, -x, z'
  4  '-y, -x, z'
  5  '-x+y, y, z'
  6  'x, x-y, z'
  7  'x+1/3, y+2/3, z+2/3'
  8  '-y+1/3, x-y+2/3, z+2/3'
  9  '-x+y+1/3, -x+2/3, z+2/3'
  10  '-y+1/3, -x+2/3, z+2/3'
  11  '-x+y+1/3, y+2/3, z+2/3'
  12  'x+1/3, x-y+2/3, z+2/3'
  13  'x+2/3, y+1/3, z+1/3'
  14  '-y+2/3, x-y+1/3, z+1/3'
  15  '-x+y+2/3, -x+1/3, z+1/3'
  16  '-y+2/3, -x+1/3, z+1/3'
  17  '-x+y+2/3, y+1/3, z+1/3'
  18  'x+2/3, x-y+1/3, z+1/3'
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  3  0.0  0.0  0.58  1.0
  Ag  Ag1  3  0.0  0.0  0.75  1.0
  C  C2  3  0.0  0.0  0.0  1.0

Ag Ag C
Ag2C crystallizes in the trigonal R3m space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a 4-coordinate geometry to one Ag(2) and three equivalent C(1) atoms. The Ag(1)-Ag(2) bond length is 1.66 Å. All Ag(1)-C(1) bond lengths are 2.45 Å. In the second Ag site, Ag(2) is bonded in a 5-coordinate geometry to one Ag(1) and four equivalent C(1) atoms. There is one shorter (2.41 Å) and three longer (2.47 Å) Ag(2)-C(1) bond lengths. C(1) is bonded in a 7-coordinate geometry to three equivalent Ag(1) and four equivalent Ag(2) atoms.