data_Sr2C
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.34
_cell_length_b   7.34
_cell_length_c   4.76
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2C
_chemical_formula_sum   'Sr6 C3'
_cell_volume   222.15
_cell_formula_units_Z   3
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
  Sr  Sr3  1  0.1  0.0  0.38  1.0
  Sr  Sr4  1  0.95  0.82  0.38  1.0
  Sr  Sr5  1  0.62  0.54  0.38  1.0
  Sr  Sr6  1  0.54  0.0  0.0  1.0
  Sr  Sr7  1  0.73  0.93  0.0  1.0
  Sr  Sr8  1  0.4  0.42  0.0  1.0
  C  C0  1  0.0  0.24  0.38  1.0
  C  C1  1  0.67  0.12  0.38  1.0
  C  C2  1  0.0  0.0  0.0  1.0

data_Sr2C
_symmetry_space_group_name_H-M   P1
_cell_length_a   4.76
_cell_length_b   7.34
_cell_length_c   7.34
_cell_angle_alpha   120.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Sr2C
_chemical_formula_sum   'Sr6 C3'
_cell_volume   222.15
_cell_formula_units_Z   3
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
  Sr  Sr0  1  0.0  0.54  0.0  1.0
  Sr  Sr1  1  0.0  0.73  0.93  1.0
  Sr  Sr2  1  0.0  0.4  0.42  1.0
  Sr  Sr3  1  0.38  0.1  0.0  1.0
  Sr  Sr4  1  0.38  0.62  0.54  1.0
  Sr  Sr5  1  0.38  0.95  0.82  1.0
  C  C6  1  0.0  0.0  0.0  1.0
  C  C7  1  0.38  0.0  0.24  1.0
  C  C8  1  0.38  0.67  0.12  1.0

Sr Sr Sr Sr Sr Sr C C C
Sr Sr Sr Sr Sr Sr C C C 0 1 - - o 0 6 o o o 0 8 o o o 1 2 o o o 1 8 + + o 2 5 o o o 3 4 o - o 3 7 o o o 4 8 + + o 4 7 o + o 6 7 - o o 6 8 o o o 
Sr2C crystallizes in the triclinic P1 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 4-coordinate geometry to one Sr(2), one C(1), and two equivalent C(3) atoms. The Sr(1)-Sr(2) bond length is 1.23 Å. The Sr(1)-C(1) bond length is 2.17 Å. There is one shorter (1.95 Å) and one longer (3.03 Å) Sr(1)-C(3) bond length. In the second Sr site, Sr(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(3), and two equivalent C(3) atoms. The Sr(2)-Sr(3) bond length is 2.26 Å. There is one shorter (2.19 Å) and one longer (3.18 Å) Sr(2)-C(3) bond length. In the third Sr site, Sr(3) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(6), and one C(2) atom. The Sr(3)-Sr(6) bond length is 2.31 Å. The Sr(3)-C(2) bond length is 3.28 Å. In the fourth Sr site, Sr(4) is bonded in a distorted single-bond geometry to one Sr(5) and two equivalent C(2) atoms. The Sr(4)-Sr(5) bond length is 1.69 Å. There is one shorter (2.03 Å) and one longer (3.08 Å) Sr(4)-C(2) bond length. In the fifth Sr site, Sr(5) is bonded in a distorted single-bond geometry to one Sr(4) and one C(3) atom. The Sr(5)-C(3) bond length is 1.79 Å. In the sixth Sr site, Sr(6) is bonded in a 3-coordinate geometry to one Sr(3), one C(1), and one C(3) atom. The Sr(6)-C(1) bond length is 3.12 Å. The Sr(6)-C(3) bond length is 3.01 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one Sr(1) and one Sr(6) atom. In the second C site, C(2) is bonded in a 1-coordinate geometry to one Sr(3) and two equivalent Sr(4) atoms. In the third C site, C(3) is bonded in a distorted water-like geometry to one Sr(5), one Sr(6), two equivalent Sr(1), and two equivalent Sr(2) atoms.