data_AcAs3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.36
_cell_length_b   6.36
_cell_length_c   5.5
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AcAs3
_chemical_formula_sum   'Ac2 As6'
_cell_volume   192.3
_cell_formula_units_Z   2
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
  Ac  Ac0  1  0.0  0.67  0.37  1.0
  Ac  Ac1  1  0.18  0.84  0.12  1.0
  As  As2  1  0.0  0.68  0.12  1.0
  As  As3  1  0.72  0.67  0.12  1.0
  As  As4  1  0.28  0.67  0.12  1.0
  As  As5  1  0.18  0.83  0.37  1.0
  As  As6  1  0.45  0.84  0.37  1.0
  As  As7  1  0.9  0.84  0.37  1.0

data_AcAs3
_symmetry_space_group_name_H-M   P-1
_cell_length_a   5.5
_cell_length_b   6.36
_cell_length_c   6.36
_cell_angle_alpha   120.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   AcAs3
_chemical_formula_sum   'Ac2 As6'
_cell_volume   192.3
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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
  Ac  Ac0  2  0.13  0.91  0.42  1.0
  As  As1  2  0.13  0.09  0.57  1.0
  As  As2  2  0.13  0.36  0.59  1.0
  As  As3  2  0.13  0.81  0.59  1.0

Ac Ac As As As As As As
AcAs3 is Hg_xSn structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one AcAs3 cluster. Ac(1) is bonded in a 3-coordinate geometry to one As(3) and two equivalent As(1) atoms. The Ac(1)-As(3) bond length is 1.49 Å. There is one shorter (1.07 Å) and one longer (1.39 Å) Ac(1)-As(1) bond length. There are three inequivalent As sites. In the first As site, As(1) is bonded in a distorted L-shaped geometry to two equivalent Ac(1) and one As(2) atom. The As(1)-As(2) bond length is 1.71 Å. In the second As site, As(2) is bonded in a 2-coordinate geometry to one As(1) and one As(3) atom. The As(2)-As(3) bond length is 1.78 Å. In the third As site, As(3) is bonded in a single-bond geometry to one Ac(1) and one As(2) atom.