data_YCu2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.04
_cell_length_b   5.04
_cell_length_c   5.04
_cell_angle_alpha   139.68
_cell_angle_beta   139.68
_cell_angle_gamma   58.34
_symmetry_Int_Tables_number   1
_chemical_formula_structural   YCu2
_chemical_formula_sum   'Y1 Cu2'
_cell_volume   53.24
_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
  Y  Y2  1  0.0  0.0  0.0  1.0
  Cu  Cu0  1  0.0  0.0  0.01  1.0
  Cu  Cu1  1  0.0  0.0  0.8  1.0

data_YCu2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.92
_cell_length_b   4.92
_cell_length_c   5.04
_cell_angle_alpha   90.0
_cell_angle_beta   119.17
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   YCu2
_chemical_formula_sum   'Y2 Cu4'
_cell_volume   106.49
_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
  Y  Y0  2  0.0  0.0  0.0  1.0
  Cu  Cu1  2  0.01  0.0  0.01  1.0
  Cu  Cu2  2  0.3  0.5  0.8  1.0

Y Cu Cu
Y Cu Cu 0 1 o o o 0 2 o o - 1 2 o o - 
YCu2 is Cyanogen Chloride-derived structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two YCu2 clusters. Y(1) is bonded in a linear geometry to one Cu(1) and one Cu(2) atom. The Y(1)-Cu(1) bond length is 0.05 Å. The Y(1)-Cu(2) bond length is 1.01 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a single-bond geometry to one Y(1) atom. In the second Cu site, Cu(2) is bonded in a single-bond geometry to one Y(1) atom.