The compound described by MgSn8(P2O9)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(6) atom. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(3), one O(8), and one O(9) atom. In the second Sn site, Sn(2) is bonded in an L-shaped geometry to one O(18) and one O(9) atom. In the third Sn site, Sn(3) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(8), and one O(9) atom. In the fourth Sn site, Sn(4) is bonded in a distorted T-shaped geometry to one O(12), one O(5), and one O(6) atom. In the fifth Sn site, Sn(5) is bonded in a distorted T-shaped geometry to one O(13), one O(14), and one O(7) atom. In the sixth Sn site, Sn(6) is bonded in a 3-coordinate geometry to one O(10), one O(15), and one O(17) atom. In the seventh Sn site, Sn(7) is bonded in an L-shaped geometry to one O(1) and one O(10) atom. In the eighth Sn site, Sn(8) is bonded in a 3-coordinate geometry to one O(10), one O(11), and one O(16) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(6), and one O(7) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(8) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(11), one O(14), one O(15), and one O(18) atom. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(12), one O(13), one O(16), and one O(17) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Sn(7), and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Sn(3) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mg(1), one Sn(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(1), one Sn(4), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sn(5) and one P(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sn(1), one Sn(3), and one P(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Sn(1), one Sn(2), and one Sn(3) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Sn(6), one Sn(7), and one Sn(8) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sn(8) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Sn(4) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Sn(5) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Sn(5) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Sn(6) and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Sn(8) and one P(4) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one Sn(6) and one P(4) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSn8(P2O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.208
_cell_length_b   8.367
_cell_length_c   7.093
_cell_angle_alpha   63.465
_cell_angle_beta   77.787
_cell_angle_gamma   94.516
_symmetry_Int_Tables_number   1
_cell_volume   570.107
_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
  Mg  Mg0  1  0.154  0.868  0.847  1.0
  Sn  Sn1  1  0.099  0.240  0.199  1.0
  Sn  Sn2  1  0.034  0.221  0.729  1.0
  Sn  Sn3  1  0.316  0.546  0.673  1.0
  Sn  Sn4  1  0.425  0.096  0.786  1.0
  Sn  Sn5  1  0.610  0.928  0.184  1.0
  Sn  Sn6  1  0.682  0.457  0.376  1.0
  Sn  Sn7  1  0.948  0.810  0.273  1.0
  Sn  Sn8  1  0.893  0.744  0.823  1.0
  P  P9  1  0.304  0.983  0.436  1.0
  P  P10  1  0.233  0.624  0.167  1.0
  P  P11  1  0.762  0.366  0.857  1.0
  P  P12  1  0.710  0.027  0.547  1.0
  O  O13  1  0.095  0.655  0.167  1.0
  O  O14  1  0.221  0.788  0.615  1.0
  O  O15  1  0.245  0.074  0.247  1.0
  O  O16  1  0.262  0.573  0.383  1.0
  O  O17  1  0.311  0.813  0.975  1.0
  O  O18  1  0.296  0.087  0.578  1.0
  O  O19  1  0.436  0.963  0.356  1.0
  O  O20  1  0.252  0.477  0.092  1.0
  O  O21  1  0.154  0.341  0.853  1.0
  O  O22  1  0.827  0.686  0.159  1.0
  O  O23  1  0.750  0.504  0.950  1.0
  O  O24  1  0.569  0.995  0.664  1.0
  O  O25  1  0.721  0.935  0.396  1.0
  O  O26  1  0.642  0.216  0.976  1.0
  O  O27  1  0.776  0.472  0.608  1.0
  O  O28  1  0.777  0.936  0.727  1.0
  O  O29  1  0.770  0.231  0.409  1.0
  O  O30  1  0.878  0.280  0.902  1.0
[/CIF]
.
The compound described by MgSn8(P2O9)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(5), and one O(6) atom. There are eight inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted T-shaped geometry to one O(3), one O(8), and one O(9) atom. In the second Sn site, Sn(2) is bonded in an L-shaped geometry to one O(18) and one O(9) atom. In the third Sn site, Sn(3) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(8), and one O(9) atom. In the fourth Sn site, Sn(4) is bonded in a distorted T-shaped geometry to one O(12), one O(5), and one O(6) atom. In the fifth Sn site, Sn(5) is bonded in a distorted T-shaped geometry to one O(13), one O(14), and one O(7) atom. In the sixth Sn site, Sn(6) is bonded in a 3-coordinate geometry to one O(10), one O(15), and one O(17) atom. In the seventh Sn site, Sn(7) is bonded in an L-shaped geometry to one O(1) and one O(10) atom. In the eighth Sn site, Sn(8) is bonded in a 3-coordinate geometry to one O(10), one O(11), and one O(16) atom. There are four inequivalent P sites. In the first P site, P(1) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(6), and one O(7) atom. In the second P site, P(2) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(5), and one O(8) atom. In the third P site, P(3) is bonded in a tetrahedral geometry to one O(11), one O(14), one O(15), and one O(18) atom. In the fourth P site, P(4) is bonded in a tetrahedral geometry to one O(12), one O(13), one O(16), and one O(17) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1), one Sn(7), and one P(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Sn(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted linear geometry to one Sn(3) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mg(1), one Sn(4), and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Mg(1), one Sn(4), and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted linear geometry to one Sn(5) and one P(1) atom. In the eighth O site, O(8) is bonded in a 2-coordinate geometry to one Sn(1), one Sn(3), and one P(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Sn(1), one Sn(2), and one Sn(3) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Sn(6), one Sn(7), and one Sn(8) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Sn(8) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Sn(4) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Sn(5) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 120 degrees geometry to one Sn(5) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Sn(6) and one P(3) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Sn(8) and one P(4) atom. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one Sn(6) and one P(4) atom. In the eighteenth O site, O(18) is bonded in a distorted bent 150 degrees geometry to one Sn(2) and one P(3) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_MgSn8(P2O9)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.208
_cell_length_b   8.367
_cell_length_c   7.093
_cell_angle_alpha   63.465
_cell_angle_beta   77.787
_cell_angle_gamma   94.516
_symmetry_Int_Tables_number   1
_cell_volume   570.107
_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
  Mg  Mg0  1  0.154  0.868  0.847  1.0
  Sn  Sn1  1  0.099  0.240  0.199  1.0
  Sn  Sn2  1  0.034  0.221  0.729  1.0
  Sn  Sn3  1  0.316  0.546  0.673  1.0
  Sn  Sn4  1  0.425  0.096  0.786  1.0
  Sn  Sn5  1  0.610  0.928  0.184  1.0
  Sn  Sn6  1  0.682  0.457  0.376  1.0
  Sn  Sn7  1  0.948  0.810  0.273  1.0
  Sn  Sn8  1  0.893  0.744  0.823  1.0
  P  P9  1  0.304  0.983  0.436  1.0
  P  P10  1  0.233  0.624  0.167  1.0
  P  P11  1  0.762  0.366  0.857  1.0
  P  P12  1  0.710  0.027  0.547  1.0
  O  O13  1  0.095  0.655  0.167  1.0
  O  O14  1  0.221  0.788  0.615  1.0
  O  O15  1  0.245  0.074  0.247  1.0
  O  O16  1  0.262  0.573  0.383  1.0
  O  O17  1  0.311  0.813  0.975  1.0
  O  O18  1  0.296  0.087  0.578  1.0
  O  O19  1  0.436  0.963  0.356  1.0
  O  O20  1  0.252  0.477  0.092  1.0
  O  O21  1  0.154  0.341  0.853  1.0
  O  O22  1  0.827  0.686  0.159  1.0
  O  O23  1  0.750  0.504  0.950  1.0
  O  O24  1  0.569  0.995  0.664  1.0
  O  O25  1  0.721  0.935  0.396  1.0
  O  O26  1  0.642  0.216  0.976  1.0
  O  O27  1  0.776  0.472  0.608  1.0
  O  O28  1  0.777  0.936  0.727  1.0
  O  O29  1  0.770  0.231  0.409  1.0
  O  O30  1  0.878  0.280  0.902  1.0
[/CIF]
.