The structure described by Pr2Ni12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 18-coordinate geometry to one Ni(1), one Ni(2), one Ni(3), one Ni(4), one Ni(5), one Ni(6), two equivalent Ni(7), two equivalent Ni(8), two equivalent Ni(9), two equivalent P(4), two equivalent P(5), and two equivalent P(6) atoms. In the second Pr site, Pr(2) is bonded in a 15-coordinate geometry to one Ni(7), one Ni(8), one Ni(9), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. There are twelve inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(1), one P(3), and two equivalent P(5) atoms. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(1), one P(2), and two equivalent P(6) atoms. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(2), one P(3), and two equivalent P(4) atoms. In the fourth Ni site, Ni(4) is bonded to one Pr(1), one P(1), one P(7), and two equivalent P(4) atoms to form distorted NiPrP4 tetrahedra that share corners with two equivalent Ni(9)Pr3P4 tetrahedra, corners with two equivalent Ni(4)PrP4 tetrahedra, corners with two equivalent Ni(5)PrP4 tetrahedra, corners with two equivalent Ni(6)PrP4 tetrahedra, edges with two equivalent Ni(8)Pr3P4 tetrahedra, and faces with two equivalent Ni(7)Pr3P4 tetrahedra. In the fifth Ni site, Ni(5) is bonded to one Pr(1), one P(2), one P(7), and two equivalent P(5) atoms to form distorted NiPrP4 tetrahedra that share corners with two equivalent Ni(7)Pr3P4 tetrahedra, corners with two equivalent Ni(4)PrP4 tetrahedra, corners with two equivalent Ni(5)PrP4 tetrahedra, corners with two equivalent Ni(6)PrP4 tetrahedra, edges with two equivalent Ni(9)Pr3P4 tetrahedra, and faces with two equivalent Ni(8)Pr3P4 tetrahedra. In the sixth Ni site, Ni(6) is bonded to one Pr(1), one P(3), one P(7), and two equivalent P(6) atoms to form distorted NiPrP4 tetrahedra that share corners with two equivalent Ni(8)Pr3P4 tetrahedra, corners with two equivalent Ni(4)PrP4 tetrahedra, corners with two equivalent Ni(5)PrP4 tetrahedra, corners with two equivalent Ni(6)PrP4 tetrahedra, edges with two equivalent Ni(7)Pr3P4 tetrahedra, and faces with two equivalent Ni(9)Pr3P4 tetrahedra. In the seventh Ni site, Ni(7) is bonded to one Pr(2), two equivalent Pr(1), one P(4), one P(6), and two equivalent P(1) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(5)PrP4 tetrahedra, corners with three equivalent Ni(8)Pr3P4 tetrahedra, corners with three equivalent Ni(9)Pr3P4 tetrahedra, edges with two equivalent Ni(7)Pr3P4 tetrahedra, edges with two equivalent Ni(6)PrP4 tetrahedra,  a faceface with one Ni(8)Pr3P4 tetrahedra,  a faceface with one Ni(9)Pr3P4 tetrahedra, and faces with two equivalent Ni(4)PrP4 tetrahedra. In the eighth Ni site, Ni(8) is bonded to one Pr(2), two equivalent Pr(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(6)PrP4 tetrahedra, corners with three equivalent Ni(7)Pr3P4 tetrahedra, corners with three equivalent Ni(9)Pr3P4 tetrahedra, edges with two equivalent Ni(8)Pr3P4 tetrahedra, edges with two equivalent Ni(4)PrP4 tetrahedra,  a faceface with one Ni(7)Pr3P4 tetrahedra,  a faceface with one Ni(9)Pr3P4 tetrahedra, and faces with two equivalent Ni(5)PrP4 tetrahedra. In the ninth Ni site, Ni(9) is bonded to one Pr(2), two equivalent Pr(1), one P(5), one P(6), and two equivalent P(3) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(4)PrP4 tetrahedra, corners with three equivalent Ni(7)Pr3P4 tetrahedra, corners with three equivalent Ni(8)Pr3P4 tetrahedra, edges with two equivalent Ni(9)Pr3P4 tetrahedra, edges with two equivalent Ni(5)PrP4 tetrahedra,  a faceface with one Ni(7)Pr3P4 tetrahedra,  a faceface with one Ni(8)Pr3P4 tetrahedra, and faces with two equivalent Ni(6)PrP4 tetrahedra. In the tenth Ni site, Ni(10) is bonded in a 5-coordinate geometry to one P(5), two equivalent P(1), and two equivalent P(7) atoms. In the eleventh Ni site, Ni(11) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(2), and two equivalent P(7) atoms. In the twelfth Ni site, Ni(12) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(3), and two equivalent P(7) atoms. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(2), one Ni(4), two equivalent Ni(10), and two equivalent Ni(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(2), one Ni(3), one Ni(5), two equivalent Ni(11), and two equivalent Ni(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(3), one Ni(6), two equivalent Ni(12), and two equivalent Ni(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(12), one Ni(7), one Ni(8), two equivalent Ni(3), and two equivalent Ni(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(10), one Ni(8), one Ni(9), two equivalent Ni(1), and two equivalent Ni(5) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(11), one Ni(7), one Ni(9), two equivalent Ni(2), and two equivalent Ni(6) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to one Ni(4), one Ni(5), one Ni(6), two equivalent Ni(10), two equivalent Ni(11), and two equivalent Ni(12) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr2Ni12P7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.106
_cell_length_b   3.762
_cell_length_c   9.109
_cell_angle_alpha   90.000
_cell_angle_beta   119.891
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   270.510
_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
  Pr  Pr0  1  0.334  0.000  0.667  1.0
  Pr  Pr1  1  0.667  0.500  0.332  1.0
  Ni  Ni2  1  0.432  0.000  0.058  1.0
  Ni  Ni3  1  0.626  0.000  0.568  1.0
  Ni  Ni4  1  0.942  0.000  0.374  1.0
  Ni  Ni5  1  0.146  0.000  0.271  1.0
  Ni  Ni6  1  0.124  0.000  0.854  1.0
  Ni  Ni7  1  0.729  0.000  0.875  1.0
  Ni  Ni8  1  0.379  0.500  0.427  1.0
  Ni  Ni9  1  0.048  0.500  0.622  1.0
  Ni  Ni10  1  0.574  0.500  0.952  1.0
  Ni  Ni11  1  0.212  0.500  0.094  1.0
  Ni  Ni12  1  0.883  0.500  0.789  1.0
  Ni  Ni13  1  0.906  0.500  0.117  1.0
  P  P14  1  0.402  0.000  0.295  1.0
  P  P15  1  0.893  0.000  0.598  1.0
  P  P16  1  0.705  0.000  0.107  1.0
  P  P17  1  0.102  0.500  0.400  1.0
  P  P18  1  0.298  0.500  0.898  1.0
  P  P19  1  0.600  0.500  0.703  1.0
  P  P20  1  1.000  0.000  1.000  1.0
[/CIF]
.
The structure described by Pr2Ni12P7 crystallizes in the monoclinic Pm space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 18-coordinate geometry to one Ni(1), one Ni(2), one Ni(3), one Ni(4), one Ni(5), one Ni(6), two equivalent Ni(7), two equivalent Ni(8), two equivalent Ni(9), two equivalent P(4), two equivalent P(5), and two equivalent P(6) atoms. In the second Pr site, Pr(2) is bonded in a 15-coordinate geometry to one Ni(7), one Ni(8), one Ni(9), two equivalent Ni(1), two equivalent Ni(2), two equivalent Ni(3), two equivalent P(1), two equivalent P(2), and two equivalent P(3) atoms. There are twelve inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(1), one P(3), and two equivalent P(5) atoms. In the second Ni site, Ni(2) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(1), one P(2), and two equivalent P(6) atoms. In the third Ni site, Ni(3) is bonded in a 4-coordinate geometry to one Pr(1), two equivalent Pr(2), one P(2), one P(3), and two equivalent P(4) atoms. In the fourth Ni site, Ni(4) is bonded to one Pr(1), one P(1), one P(7), and two equivalent P(4) atoms to form distorted NiPrP4 tetrahedra that share corners with two equivalent Ni(9)Pr3P4 tetrahedra, corners with two equivalent Ni(4)PrP4 tetrahedra, corners with two equivalent Ni(5)PrP4 tetrahedra, corners with two equivalent Ni(6)PrP4 tetrahedra, edges with two equivalent Ni(8)Pr3P4 tetrahedra, and faces with two equivalent Ni(7)Pr3P4 tetrahedra. In the fifth Ni site, Ni(5) is bonded to one Pr(1), one P(2), one P(7), and two equivalent P(5) atoms to form distorted NiPrP4 tetrahedra that share corners with two equivalent Ni(7)Pr3P4 tetrahedra, corners with two equivalent Ni(4)PrP4 tetrahedra, corners with two equivalent Ni(5)PrP4 tetrahedra, corners with two equivalent Ni(6)PrP4 tetrahedra, edges with two equivalent Ni(9)Pr3P4 tetrahedra, and faces with two equivalent Ni(8)Pr3P4 tetrahedra. In the sixth Ni site, Ni(6) is bonded to one Pr(1), one P(3), one P(7), and two equivalent P(6) atoms to form distorted NiPrP4 tetrahedra that share corners with two equivalent Ni(8)Pr3P4 tetrahedra, corners with two equivalent Ni(4)PrP4 tetrahedra, corners with two equivalent Ni(5)PrP4 tetrahedra, corners with two equivalent Ni(6)PrP4 tetrahedra, edges with two equivalent Ni(7)Pr3P4 tetrahedra, and faces with two equivalent Ni(9)Pr3P4 tetrahedra. In the seventh Ni site, Ni(7) is bonded to one Pr(2), two equivalent Pr(1), one P(4), one P(6), and two equivalent P(1) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(5)PrP4 tetrahedra, corners with three equivalent Ni(8)Pr3P4 tetrahedra, corners with three equivalent Ni(9)Pr3P4 tetrahedra, edges with two equivalent Ni(7)Pr3P4 tetrahedra, edges with two equivalent Ni(6)PrP4 tetrahedra,  a faceface with one Ni(8)Pr3P4 tetrahedra,  a faceface with one Ni(9)Pr3P4 tetrahedra, and faces with two equivalent Ni(4)PrP4 tetrahedra. In the eighth Ni site, Ni(8) is bonded to one Pr(2), two equivalent Pr(1), one P(4), one P(5), and two equivalent P(2) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(6)PrP4 tetrahedra, corners with three equivalent Ni(7)Pr3P4 tetrahedra, corners with three equivalent Ni(9)Pr3P4 tetrahedra, edges with two equivalent Ni(8)Pr3P4 tetrahedra, edges with two equivalent Ni(4)PrP4 tetrahedra,  a faceface with one Ni(7)Pr3P4 tetrahedra,  a faceface with one Ni(9)Pr3P4 tetrahedra, and faces with two equivalent Ni(5)PrP4 tetrahedra. In the ninth Ni site, Ni(9) is bonded to one Pr(2), two equivalent Pr(1), one P(5), one P(6), and two equivalent P(3) atoms to form distorted NiPr3P4 tetrahedra that share corners with two equivalent Ni(4)PrP4 tetrahedra, corners with three equivalent Ni(7)Pr3P4 tetrahedra, corners with three equivalent Ni(8)Pr3P4 tetrahedra, edges with two equivalent Ni(9)Pr3P4 tetrahedra, edges with two equivalent Ni(5)PrP4 tetrahedra,  a faceface with one Ni(7)Pr3P4 tetrahedra,  a faceface with one Ni(8)Pr3P4 tetrahedra, and faces with two equivalent Ni(6)PrP4 tetrahedra. In the tenth Ni site, Ni(10) is bonded in a 5-coordinate geometry to one P(5), two equivalent P(1), and two equivalent P(7) atoms. In the eleventh Ni site, Ni(11) is bonded in a 5-coordinate geometry to one P(6), two equivalent P(2), and two equivalent P(7) atoms. In the twelfth Ni site, Ni(12) is bonded in a 5-coordinate geometry to one P(4), two equivalent P(3), and two equivalent P(7) atoms. There are seven inequivalent P sites. In the first P site, P(1) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(2), one Ni(4), two equivalent Ni(10), and two equivalent Ni(7) atoms. In the second P site, P(2) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(2), one Ni(3), one Ni(5), two equivalent Ni(11), and two equivalent Ni(8) atoms. In the third P site, P(3) is bonded in a 9-coordinate geometry to two equivalent Pr(2), one Ni(1), one Ni(3), one Ni(6), two equivalent Ni(12), and two equivalent Ni(9) atoms. In the fourth P site, P(4) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(12), one Ni(7), one Ni(8), two equivalent Ni(3), and two equivalent Ni(4) atoms. In the fifth P site, P(5) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(10), one Ni(8), one Ni(9), two equivalent Ni(1), and two equivalent Ni(5) atoms. In the sixth P site, P(6) is bonded in a 9-coordinate geometry to two equivalent Pr(1), one Ni(11), one Ni(7), one Ni(9), two equivalent Ni(2), and two equivalent Ni(6) atoms. In the seventh P site, P(7) is bonded in a 9-coordinate geometry to one Ni(4), one Ni(5), one Ni(6), two equivalent Ni(10), two equivalent Ni(11), and two equivalent Ni(12) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_Pr2Ni12P7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.106
_cell_length_b   3.762
_cell_length_c   9.109
_cell_angle_alpha   90.000
_cell_angle_beta   119.891
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   270.510
_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
  Pr  Pr0  1  0.334  0.000  0.667  1.0
  Pr  Pr1  1  0.667  0.500  0.332  1.0
  Ni  Ni2  1  0.432  0.000  0.058  1.0
  Ni  Ni3  1  0.626  0.000  0.568  1.0
  Ni  Ni4  1  0.942  0.000  0.374  1.0
  Ni  Ni5  1  0.146  0.000  0.271  1.0
  Ni  Ni6  1  0.124  0.000  0.854  1.0
  Ni  Ni7  1  0.729  0.000  0.875  1.0
  Ni  Ni8  1  0.379  0.500  0.427  1.0
  Ni  Ni9  1  0.048  0.500  0.622  1.0
  Ni  Ni10  1  0.574  0.500  0.952  1.0
  Ni  Ni11  1  0.212  0.500  0.094  1.0
  Ni  Ni12  1  0.883  0.500  0.789  1.0
  Ni  Ni13  1  0.906  0.500  0.117  1.0
  P  P14  1  0.402  0.000  0.295  1.0
  P  P15  1  0.893  0.000  0.598  1.0
  P  P16  1  0.705  0.000  0.107  1.0
  P  P17  1  0.102  0.500  0.400  1.0
  P  P18  1  0.298  0.500  0.898  1.0
  P  P19  1  0.600  0.500  0.703  1.0
  P  P20  1  1.000  0.000  1.000  1.0
[/CIF]
.