The material structure described by Sn16P15 crystallizes in the triclinic P1 space group. There are sixteen inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to two equivalent Sn(9), one P(14), and one P(7) atom. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one P(7) and two equivalent P(9) atoms. In the third Sn site, Sn(3) is bonded in a distorted L-shaped geometry to one P(2) and one P(8) atom. In the fourth Sn site, Sn(4) is bonded in a distorted L-shaped geometry to one P(2) and two equivalent P(11) atoms. In the fifth Sn site, Sn(5) is bonded in a 1-coordinate geometry to two equivalent Sn(13) and two equivalent P(10) atoms. In the sixth Sn site, Sn(6) is bonded in a distorted L-shaped geometry to two equivalent Sn(14), one P(12), and one P(3) atom. In the seventh Sn site, Sn(7) is bonded in a distorted bent 150 degrees geometry to one P(13) and one P(5) atom. In the eighth Sn site, Sn(8) is bonded in a 4-coordinate geometry to two equivalent Sn(16), one P(13), and one P(14) atom. In the ninth Sn site, Sn(9) is bonded in a 4-coordinate geometry to two equivalent Sn(1), one P(14), and one P(7) atom. In the tenth Sn site, Sn(10) is bonded in a 3-coordinate geometry to one P(9) and two equivalent P(1) atoms. In the eleventh Sn site, Sn(11) is bonded in a distorted trigonal non-coplanar geometry to one P(6) and two equivalent P(8) atoms. In the twelfth Sn site, Sn(12) is bonded in a 1-coordinate geometry to one P(10), one P(11), and one P(6) atom. In the thirteenth Sn site, Sn(13) is bonded in a 5-coordinate geometry to two equivalent Sn(5), one P(3), and two equivalent P(10) atoms. In the fourteenth Sn site, Sn(14) is bonded in a 4-coordinate geometry to two equivalent Sn(6), one P(15), and one P(3) atom. In the fifteenth Sn site, Sn(15) is bonded in a distorted bent 150 degrees geometry to one P(15) and one P(4) atom. In the sixteenth Sn site, Sn(16) is bonded in a 2-coordinate geometry to two equivalent Sn(8), one P(14), and one P(4) atom. There are fifteen inequivalent P sites. In the first P site, P(1) is bonded in a trigonal planar geometry to two equivalent Sn(10) and one P(8) atom. In the second P site, P(2) is bonded to one Sn(3), one Sn(4), one P(11), and one P(6) atom to form distorted corner-sharing PSn2P2 tetrahedra. In the third P site, P(3) is bonded in a distorted T-shaped geometry to one Sn(13), one Sn(14), and one Sn(6) atom. In the fourth P site, P(4) is bonded in a distorted trigonal non-coplanar geometry to one Sn(15), one Sn(16), and one P(13) atom. In the fifth P site, P(5) is bonded in a distorted trigonal non-coplanar geometry to one Sn(7), one P(12), and one P(15) atom. In the sixth P site, P(6) is bonded in a distorted square co-planar geometry to one Sn(11), one Sn(12), one P(11), and one P(2) atom. In the seventh P site, P(7) is bonded in a distorted see-saw-like geometry to one Sn(1), one Sn(2), one Sn(9), and one P(9) atom. In the eighth P site, P(8) is bonded to one Sn(3), two equivalent Sn(11), and one P(1) atom to form distorted PSn3P tetrahedra that share  a cornercorner with one P(2)Sn2P2 tetrahedra and corners with two equivalent P(8)Sn3P tetrahedra. In the ninth P site, P(9) is bonded in a 4-coordinate geometry to one Sn(10), two equivalent Sn(2), and one P(7) atom. In the tenth P site, P(10) is bonded in a 5-coordinate geometry to one Sn(12), two equivalent Sn(13), and two equivalent Sn(5) atoms. In the eleventh P site, P(11) is bonded in a 5-coordinate geometry to one Sn(12), two equivalent Sn(4), one P(2), and one P(6) atom. In the twelfth P site, P(12) is bonded in a distorted trigonal non-coplanar geometry to one Sn(6), one P(15), and one P(5) atom. In the thirteenth P site, P(13) is bonded in a distorted T-shaped geometry to one Sn(7), one Sn(8), and one P(4) atom. In the fourteenth P site, P(14) is bonded in a 4-coordinate geometry to one Sn(1), one Sn(16), one Sn(8), and one Sn(9) atom. In the fifteenth P site, P(15) is bonded in a see-saw-like geometry to one Sn(14), one Sn(15), one P(12), and one P(5) atom. is represented by the CIF card [CIF]
data_Sn16P15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.663
_cell_length_b   5.413
_cell_length_c   36.858
_cell_angle_alpha   89.533
_cell_angle_beta   93.553
_cell_angle_gamma   107.076
_symmetry_Int_Tables_number   1
_cell_volume   887.647
_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
  Sn  Sn0  1  0.230  0.638  0.942  1.0
  Sn  Sn1  1  0.079  0.749  0.838  1.0
  Sn  Sn2  1  0.977  0.950  0.688  1.0
  Sn  Sn3  1  0.953  0.004  0.556  1.0
  Sn  Sn4  1  0.753  0.161  0.476  1.0
  Sn  Sn5  1  0.531  0.224  0.344  1.0
  Sn  Sn6  1  0.526  0.474  0.185  1.0
  Sn  Sn7  1  0.279  0.518  0.045  1.0
  Sn  Sn8  1  0.624  0.314  0.958  1.0
  Sn  Sn9  1  0.401  0.339  0.808  1.0
  Sn  Sn10  1  0.353  0.558  0.694  1.0
  Sn  Sn11  1  0.270  0.601  0.540  1.0
  Sn  Sn12  1  0.928  0.724  0.439  1.0
  Sn  Sn13  1  0.915  0.900  0.335  1.0
  Sn  Sn14  1  0.901  0.110  0.186  1.0
  Sn  Sn15  1  0.663  0.188  0.051  1.0
  P  P16  1  0.859  0.336  0.771  1.0
  P  P17  1  0.705  0.927  0.621  1.0
  P  P18  1  0.998  0.539  0.376  1.0
  P  P19  1  0.684  0.015  0.117  1.0
  P  P20  1  0.484  0.576  0.256  1.0
  P  P21  1  0.356  0.541  0.622  1.0
  P  P22  1  0.397  0.037  0.898  1.0
  P  P23  1  0.773  0.315  0.714  1.0
  P  P24  1  0.676  0.061  0.853  1.0
  P  P25  1  0.315  0.505  0.471  1.0
  P  P26  1  0.501  0.241  0.592  1.0
  P  P27  1  0.766  0.343  0.282  1.0
  P  P28  1  0.458  0.623  0.114  1.0
  P  P29  1  0.606  0.845  0.999  1.0
  P  P30  1  0.840  0.967  0.260  1.0
[/CIF]
.
The material structure described by Sn16P15 crystallizes in the triclinic P1 space group. There are sixteen inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to two equivalent Sn(9), one P(14), and one P(7) atom. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one P(7) and two equivalent P(9) atoms. In the third Sn site, Sn(3) is bonded in a distorted L-shaped geometry to one P(2) and one P(8) atom. In the fourth Sn site, Sn(4) is bonded in a distorted L-shaped geometry to one P(2) and two equivalent P(11) atoms. In the fifth Sn site, Sn(5) is bonded in a 1-coordinate geometry to two equivalent Sn(13) and two equivalent P(10) atoms. In the sixth Sn site, Sn(6) is bonded in a distorted L-shaped geometry to two equivalent Sn(14), one P(12), and one P(3) atom. In the seventh Sn site, Sn(7) is bonded in a distorted bent 150 degrees geometry to one P(13) and one P(5) atom. In the eighth Sn site, Sn(8) is bonded in a 4-coordinate geometry to two equivalent Sn(16), one P(13), and one P(14) atom. In the ninth Sn site, Sn(9) is bonded in a 4-coordinate geometry to two equivalent Sn(1), one P(14), and one P(7) atom. In the tenth Sn site, Sn(10) is bonded in a 3-coordinate geometry to one P(9) and two equivalent P(1) atoms. In the eleventh Sn site, Sn(11) is bonded in a distorted trigonal non-coplanar geometry to one P(6) and two equivalent P(8) atoms. In the twelfth Sn site, Sn(12) is bonded in a 1-coordinate geometry to one P(10), one P(11), and one P(6) atom. In the thirteenth Sn site, Sn(13) is bonded in a 5-coordinate geometry to two equivalent Sn(5), one P(3), and two equivalent P(10) atoms. In the fourteenth Sn site, Sn(14) is bonded in a 4-coordinate geometry to two equivalent Sn(6), one P(15), and one P(3) atom. In the fifteenth Sn site, Sn(15) is bonded in a distorted bent 150 degrees geometry to one P(15) and one P(4) atom. In the sixteenth Sn site, Sn(16) is bonded in a 2-coordinate geometry to two equivalent Sn(8), one P(14), and one P(4) atom. There are fifteen inequivalent P sites. In the first P site, P(1) is bonded in a trigonal planar geometry to two equivalent Sn(10) and one P(8) atom. In the second P site, P(2) is bonded to one Sn(3), one Sn(4), one P(11), and one P(6) atom to form distorted corner-sharing PSn2P2 tetrahedra. In the third P site, P(3) is bonded in a distorted T-shaped geometry to one Sn(13), one Sn(14), and one Sn(6) atom. In the fourth P site, P(4) is bonded in a distorted trigonal non-coplanar geometry to one Sn(15), one Sn(16), and one P(13) atom. In the fifth P site, P(5) is bonded in a distorted trigonal non-coplanar geometry to one Sn(7), one P(12), and one P(15) atom. In the sixth P site, P(6) is bonded in a distorted square co-planar geometry to one Sn(11), one Sn(12), one P(11), and one P(2) atom. In the seventh P site, P(7) is bonded in a distorted see-saw-like geometry to one Sn(1), one Sn(2), one Sn(9), and one P(9) atom. In the eighth P site, P(8) is bonded to one Sn(3), two equivalent Sn(11), and one P(1) atom to form distorted PSn3P tetrahedra that share  a cornercorner with one P(2)Sn2P2 tetrahedra and corners with two equivalent P(8)Sn3P tetrahedra. In the ninth P site, P(9) is bonded in a 4-coordinate geometry to one Sn(10), two equivalent Sn(2), and one P(7) atom. In the tenth P site, P(10) is bonded in a 5-coordinate geometry to one Sn(12), two equivalent Sn(13), and two equivalent Sn(5) atoms. In the eleventh P site, P(11) is bonded in a 5-coordinate geometry to one Sn(12), two equivalent Sn(4), one P(2), and one P(6) atom. In the twelfth P site, P(12) is bonded in a distorted trigonal non-coplanar geometry to one Sn(6), one P(15), and one P(5) atom. In the thirteenth P site, P(13) is bonded in a distorted T-shaped geometry to one Sn(7), one Sn(8), and one P(4) atom. In the fourteenth P site, P(14) is bonded in a 4-coordinate geometry to one Sn(1), one Sn(16), one Sn(8), and one Sn(9) atom. In the fifteenth P site, P(15) is bonded in a see-saw-like geometry to one Sn(14), one Sn(15), one P(12), and one P(5) atom. is represented by the CIF card [CIF]
data_Sn16P15
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.663
_cell_length_b   5.413
_cell_length_c   36.858
_cell_angle_alpha   89.533
_cell_angle_beta   93.553
_cell_angle_gamma   107.076
_symmetry_Int_Tables_number   1
_cell_volume   887.647
_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
  Sn  Sn0  1  0.230  0.638  0.942  1.0
  Sn  Sn1  1  0.079  0.749  0.838  1.0
  Sn  Sn2  1  0.977  0.950  0.688  1.0
  Sn  Sn3  1  0.953  0.004  0.556  1.0
  Sn  Sn4  1  0.753  0.161  0.476  1.0
  Sn  Sn5  1  0.531  0.224  0.344  1.0
  Sn  Sn6  1  0.526  0.474  0.185  1.0
  Sn  Sn7  1  0.279  0.518  0.045  1.0
  Sn  Sn8  1  0.624  0.314  0.958  1.0
  Sn  Sn9  1  0.401  0.339  0.808  1.0
  Sn  Sn10  1  0.353  0.558  0.694  1.0
  Sn  Sn11  1  0.270  0.601  0.540  1.0
  Sn  Sn12  1  0.928  0.724  0.439  1.0
  Sn  Sn13  1  0.915  0.900  0.335  1.0
  Sn  Sn14  1  0.901  0.110  0.186  1.0
  Sn  Sn15  1  0.663  0.188  0.051  1.0
  P  P16  1  0.859  0.336  0.771  1.0
  P  P17  1  0.705  0.927  0.621  1.0
  P  P18  1  0.998  0.539  0.376  1.0
  P  P19  1  0.684  0.015  0.117  1.0
  P  P20  1  0.484  0.576  0.256  1.0
  P  P21  1  0.356  0.541  0.622  1.0
  P  P22  1  0.397  0.037  0.898  1.0
  P  P23  1  0.773  0.315  0.714  1.0
  P  P24  1  0.676  0.061  0.853  1.0
  P  P25  1  0.315  0.505  0.471  1.0
  P  P26  1  0.501  0.241  0.592  1.0
  P  P27  1  0.766  0.343  0.282  1.0
  P  P28  1  0.458  0.623  0.114  1.0
  P  P29  1  0.606  0.845  0.999  1.0
  P  P30  1  0.840  0.967  0.260  1.0
[/CIF]
.