The compound described by Sm2(CuAs)3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to three equivalent Cu(3), two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the second Sm site, Sm(2) is bonded in a 11-coordinate geometry to one Cu(3), two equivalent Cu(1), two equivalent Cu(2), one As(2), two equivalent As(1), and three equivalent As(3) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Sm(2), one As(1), and three equivalent As(2) atoms to form distorted CuSm2As4 tetrahedra that share corners with four equivalent As(3)Sm5Cu2 pentagonal bipyramids,  an edgeedge with one As(3)Sm5Cu2 pentagonal bipyramid, and edges with four equivalent Cu(1)Sm2As4 tetrahedra. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to two equivalent Sm(2), two equivalent Cu(3), one As(1), one As(3), and two equivalent As(2) atoms. In the third Cu site, Cu(3) is bonded in a 10-coordinate geometry to one Sm(2), three equivalent Sm(1), two equivalent Cu(2), one As(2), one As(3), and two equivalent As(1) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Cu(1), one Cu(2), and two equivalent Cu(3) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to one Sm(2), two equivalent Sm(1), one Cu(3), two equivalent Cu(2), and three equivalent Cu(1) atoms. In the third As site, As(3) is bonded to two equivalent Sm(1), three equivalent Sm(2), one Cu(2), and one Cu(3) atom to form distorted AsSm5Cu2 pentagonal bipyramids that share corners with four equivalent Cu(1)Sm2As4 tetrahedra, edges with four equivalent As(3)Sm5Cu2 pentagonal bipyramids, and  an edgeedge with one Cu(1)Sm2As4 tetrahedra. is represented by the CIF card [CIF]
data_Sm2(CuAs)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.039
_cell_length_b   11.112
_cell_length_c   13.385
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   600.758
_cell_formula_units_Z   4
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
  Sm  Sm0  1  0.250  0.932  0.796  1.0
  Sm  Sm1  1  0.750  0.432  0.704  1.0
  Sm  Sm2  1  0.250  0.568  0.296  1.0
  Sm  Sm3  1  0.750  0.068  0.204  1.0
  Sm  Sm4  1  0.250  0.842  0.502  1.0
  Sm  Sm5  1  0.750  0.342  0.998  1.0
  Sm  Sm6  1  0.250  0.658  0.002  1.0
  Sm  Sm7  1  0.750  0.158  0.498  1.0
  Cu  Cu8  1  0.250  0.394  0.513  1.0
  Cu  Cu9  1  0.750  0.894  0.987  1.0
  Cu  Cu10  1  0.250  0.106  0.013  1.0
  Cu  Cu11  1  0.750  0.606  0.487  1.0
  Cu  Cu12  1  0.250  0.277  0.333  1.0
  Cu  Cu13  1  0.750  0.777  0.167  1.0
  Cu  Cu14  1  0.250  0.223  0.833  1.0
  Cu  Cu15  1  0.750  0.723  0.667  1.0
  Cu  Cu16  1  0.250  0.857  0.275  1.0
  Cu  Cu17  1  0.750  0.357  0.225  1.0
  Cu  Cu18  1  0.250  0.643  0.775  1.0
  Cu  Cu19  1  0.750  0.143  0.725  1.0
  As  As20  1  0.250  0.237  0.646  1.0
  As  As21  1  0.750  0.737  0.854  1.0
  As  As22  1  0.250  0.263  0.146  1.0
  As  As23  1  0.750  0.763  0.354  1.0
  As  As24  1  0.250  0.600  0.596  1.0
  As  As25  1  0.750  0.100  0.904  1.0
  As  As26  1  0.250  0.900  0.096  1.0
  As  As27  1  0.750  0.400  0.404  1.0
  As  As28  1  0.250  0.058  0.366  1.0
  As  As29  1  0.750  0.558  0.134  1.0
  As  As30  1  0.250  0.442  0.866  1.0
  As  As31  1  0.750  0.942  0.634  1.0
[/CIF]
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The compound described by Sm2(CuAs)3 crystallizes in the orthorhombic Pnma space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 6-coordinate geometry to three equivalent Cu(3), two equivalent As(1), two equivalent As(2), and two equivalent As(3) atoms. In the second Sm site, Sm(2) is bonded in a 11-coordinate geometry to one Cu(3), two equivalent Cu(1), two equivalent Cu(2), one As(2), two equivalent As(1), and three equivalent As(3) atoms. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to two equivalent Sm(2), one As(1), and three equivalent As(2) atoms to form distorted CuSm2As4 tetrahedra that share corners with four equivalent As(3)Sm5Cu2 pentagonal bipyramids,  an edgeedge with one As(3)Sm5Cu2 pentagonal bipyramid, and edges with four equivalent Cu(1)Sm2As4 tetrahedra. In the second Cu site, Cu(2) is bonded in a 4-coordinate geometry to two equivalent Sm(2), two equivalent Cu(3), one As(1), one As(3), and two equivalent As(2) atoms. In the third Cu site, Cu(3) is bonded in a 10-coordinate geometry to one Sm(2), three equivalent Sm(1), two equivalent Cu(2), one As(2), one As(3), and two equivalent As(1) atoms. There are three inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to two equivalent Sm(1), two equivalent Sm(2), one Cu(1), one Cu(2), and two equivalent Cu(3) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to one Sm(2), two equivalent Sm(1), one Cu(3), two equivalent Cu(2), and three equivalent Cu(1) atoms. In the third As site, As(3) is bonded to two equivalent Sm(1), three equivalent Sm(2), one Cu(2), and one Cu(3) atom to form distorted AsSm5Cu2 pentagonal bipyramids that share corners with four equivalent Cu(1)Sm2As4 tetrahedra, edges with four equivalent As(3)Sm5Cu2 pentagonal bipyramids, and  an edgeedge with one Cu(1)Sm2As4 tetrahedra. is represented by the CIF card [CIF]
data_Sm2(CuAs)3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.039
_cell_length_b   11.112
_cell_length_c   13.385
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   600.758
_cell_formula_units_Z   4
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
  Sm  Sm0  1  0.250  0.932  0.796  1.0
  Sm  Sm1  1  0.750  0.432  0.704  1.0
  Sm  Sm2  1  0.250  0.568  0.296  1.0
  Sm  Sm3  1  0.750  0.068  0.204  1.0
  Sm  Sm4  1  0.250  0.842  0.502  1.0
  Sm  Sm5  1  0.750  0.342  0.998  1.0
  Sm  Sm6  1  0.250  0.658  0.002  1.0
  Sm  Sm7  1  0.750  0.158  0.498  1.0
  Cu  Cu8  1  0.250  0.394  0.513  1.0
  Cu  Cu9  1  0.750  0.894  0.987  1.0
  Cu  Cu10  1  0.250  0.106  0.013  1.0
  Cu  Cu11  1  0.750  0.606  0.487  1.0
  Cu  Cu12  1  0.250  0.277  0.333  1.0
  Cu  Cu13  1  0.750  0.777  0.167  1.0
  Cu  Cu14  1  0.250  0.223  0.833  1.0
  Cu  Cu15  1  0.750  0.723  0.667  1.0
  Cu  Cu16  1  0.250  0.857  0.275  1.0
  Cu  Cu17  1  0.750  0.357  0.225  1.0
  Cu  Cu18  1  0.250  0.643  0.775  1.0
  Cu  Cu19  1  0.750  0.143  0.725  1.0
  As  As20  1  0.250  0.237  0.646  1.0
  As  As21  1  0.750  0.737  0.854  1.0
  As  As22  1  0.250  0.263  0.146  1.0
  As  As23  1  0.750  0.763  0.354  1.0
  As  As24  1  0.250  0.600  0.596  1.0
  As  As25  1  0.750  0.100  0.904  1.0
  As  As26  1  0.250  0.900  0.096  1.0
  As  As27  1  0.750  0.400  0.404  1.0
  As  As28  1  0.250  0.058  0.366  1.0
  As  As29  1  0.750  0.558  0.134  1.0
  As  As30  1  0.250  0.442  0.866  1.0
  As  As31  1  0.750  0.942  0.634  1.0
[/CIF]
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