The compound described by Mg(AlB14)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 2-coordinate geometry to two equivalent B(10), two equivalent B(11), two equivalent B(12), two equivalent B(14), two equivalent B(5), two equivalent B(8), and two equivalent B(9) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted cuboctahedral geometry to two equivalent B(1), two equivalent B(13), two equivalent B(14), two equivalent B(2), two equivalent B(5), and two equivalent B(7) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent B(12), two equivalent B(13), two equivalent B(6), two equivalent B(7), and two equivalent B(9) atoms. There are fourteen inequivalent B sites. In the first B site, B(1) is bonded in a 7-coordinate geometry to one Al(1), one B(10), one B(11), one B(13), one B(3), one B(5), and one B(8) atom. In the second B site, B(2) is bonded in a 7-coordinate geometry to one Al(1), one B(12), one B(14), one B(4), one B(6), one B(7), and one B(9) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to one B(1), one B(12), one B(3), one B(5), one B(8), and one B(9) atom. In the fourth B site, B(4) is bonded in a 6-coordinate geometry to one B(10), one B(11), one B(2), one B(4), one B(6), and one B(7) atom. In the fifth B site, B(5) is bonded in a 8-coordinate geometry to one Mg(1), one Al(1), one B(1), one B(10), one B(14), one B(3), one B(6), and one B(9) atom. In the sixth B site, B(6) is bonded in a 7-coordinate geometry to one Al(2), one B(10), one B(13), one B(2), one B(4), one B(5), and one B(9) atom. In the seventh B site, B(7) is bonded in a 8-coordinate geometry to one Al(1), one Al(2), one B(11), one B(12), one B(13), one B(2), one B(4), and one B(8) atom. In the eighth B site, B(8) is bonded in a 7-coordinate geometry to one Mg(1), one B(1), one B(11), one B(12), one B(14), one B(3), and one B(7) atom. In the ninth B site, B(9) is bonded in a 8-coordinate geometry to one Mg(1), one Al(2), one B(11), one B(12), one B(2), one B(3), one B(5), and one B(6) atom. In the tenth B site, B(10) is bonded in a 7-coordinate geometry to one Mg(1), one B(1), one B(11), one B(12), one B(4), one B(5), and one B(6) atom. In the eleventh B site, B(11) is bonded in a 7-coordinate geometry to one Mg(1), one B(1), one B(10), one B(4), one B(7), one B(8), and one B(9) atom. In the twelfth B site, B(12) is bonded in a 8-coordinate geometry to one Mg(1), one Al(2), one B(10), one B(2), one B(3), one B(7), one B(8), and one B(9) atom. In the thirteenth B site, B(13) is bonded in a 6-coordinate geometry to one Al(1), one Al(2), one B(1), one B(13), one B(6), and one B(7) atom. In the fourteenth B site, B(14) is bonded in a 6-coordinate geometry to one Mg(1), one Al(1), one B(14), one B(2), one B(5), and one B(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(AlB14)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.109
_cell_length_b   7.109
_cell_length_c   5.889
_cell_angle_alpha   65.776
_cell_angle_beta   65.776
_cell_angle_gamma   91.462
_symmetry_Int_Tables_number   1
_cell_volume   240.710
_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  0.887  0.887  0.365  1.0
  Al  Al1  1  0.502  0.502  0.501  1.0
  Al  Al2  1  0.133  0.133  0.613  1.0
  B  B3  1  0.410  0.735  0.173  1.0
  B  B4  1  0.591  0.264  0.827  1.0
  B  B5  1  0.264  0.591  0.827  1.0
  B  B6  1  0.735  0.410  0.173  1.0
  B  B7  1  0.689  0.854  0.976  1.0
  B  B8  1  0.310  0.142  0.027  1.0
  B  B9  1  0.142  0.310  0.027  1.0
  B  B10  1  0.854  0.689  0.976  1.0
  B  B11  1  0.535  0.874  0.294  1.0
  B  B12  1  0.467  0.128  0.201  1.0
  B  B13  1  0.128  0.467  0.201  1.0
  B  B14  1  0.874  0.535  0.294  1.0
  B  B15  1  0.465  0.123  0.710  1.0
  B  B16  1  0.534  0.869  0.798  1.0
  B  B17  1  0.869  0.534  0.798  1.0
  B  B18  1  0.123  0.465  0.710  1.0
  B  B19  1  0.730  0.098  0.990  1.0
  B  B20  1  0.274  0.900  0.320  1.0
  B  B21  1  0.900  0.274  0.320  1.0
  B  B22  1  0.098  0.730  0.990  1.0
  B  B23  1  0.272  0.901  0.007  1.0
  B  B24  1  0.729  0.098  0.681  1.0
  B  B25  1  0.098  0.729  0.681  1.0
  B  B26  1  0.901  0.272  0.007  1.0
  B  B27  1  0.268  0.466  0.382  1.0
  B  B28  1  0.725  0.531  0.625  1.0
  B  B29  1  0.531  0.725  0.625  1.0
  B  B30  1  0.466  0.268  0.382  1.0
[/CIF]
.
The compound described by Mg(AlB14)2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 2-coordinate geometry to two equivalent B(10), two equivalent B(11), two equivalent B(12), two equivalent B(14), two equivalent B(5), two equivalent B(8), and two equivalent B(9) atoms. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted cuboctahedral geometry to two equivalent B(1), two equivalent B(13), two equivalent B(14), two equivalent B(2), two equivalent B(5), and two equivalent B(7) atoms. In the second Al site, Al(2) is bonded in a 2-coordinate geometry to two equivalent B(12), two equivalent B(13), two equivalent B(6), two equivalent B(7), and two equivalent B(9) atoms. There are fourteen inequivalent B sites. In the first B site, B(1) is bonded in a 7-coordinate geometry to one Al(1), one B(10), one B(11), one B(13), one B(3), one B(5), and one B(8) atom. In the second B site, B(2) is bonded in a 7-coordinate geometry to one Al(1), one B(12), one B(14), one B(4), one B(6), one B(7), and one B(9) atom. In the third B site, B(3) is bonded in a 6-coordinate geometry to one B(1), one B(12), one B(3), one B(5), one B(8), and one B(9) atom. In the fourth B site, B(4) is bonded in a 6-coordinate geometry to one B(10), one B(11), one B(2), one B(4), one B(6), and one B(7) atom. In the fifth B site, B(5) is bonded in a 8-coordinate geometry to one Mg(1), one Al(1), one B(1), one B(10), one B(14), one B(3), one B(6), and one B(9) atom. In the sixth B site, B(6) is bonded in a 7-coordinate geometry to one Al(2), one B(10), one B(13), one B(2), one B(4), one B(5), and one B(9) atom. In the seventh B site, B(7) is bonded in a 8-coordinate geometry to one Al(1), one Al(2), one B(11), one B(12), one B(13), one B(2), one B(4), and one B(8) atom. In the eighth B site, B(8) is bonded in a 7-coordinate geometry to one Mg(1), one B(1), one B(11), one B(12), one B(14), one B(3), and one B(7) atom. In the ninth B site, B(9) is bonded in a 8-coordinate geometry to one Mg(1), one Al(2), one B(11), one B(12), one B(2), one B(3), one B(5), and one B(6) atom. In the tenth B site, B(10) is bonded in a 7-coordinate geometry to one Mg(1), one B(1), one B(11), one B(12), one B(4), one B(5), and one B(6) atom. In the eleventh B site, B(11) is bonded in a 7-coordinate geometry to one Mg(1), one B(1), one B(10), one B(4), one B(7), one B(8), and one B(9) atom. In the twelfth B site, B(12) is bonded in a 8-coordinate geometry to one Mg(1), one Al(2), one B(10), one B(2), one B(3), one B(7), one B(8), and one B(9) atom. In the thirteenth B site, B(13) is bonded in a 6-coordinate geometry to one Al(1), one Al(2), one B(1), one B(13), one B(6), and one B(7) atom. In the fourteenth B site, B(14) is bonded in a 6-coordinate geometry to one Mg(1), one Al(1), one B(14), one B(2), one B(5), and one B(8) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Mg(AlB14)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.109
_cell_length_b   7.109
_cell_length_c   5.889
_cell_angle_alpha   65.776
_cell_angle_beta   65.776
_cell_angle_gamma   91.462
_symmetry_Int_Tables_number   1
_cell_volume   240.710
_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  0.887  0.887  0.365  1.0
  Al  Al1  1  0.502  0.502  0.501  1.0
  Al  Al2  1  0.133  0.133  0.613  1.0
  B  B3  1  0.410  0.735  0.173  1.0
  B  B4  1  0.591  0.264  0.827  1.0
  B  B5  1  0.264  0.591  0.827  1.0
  B  B6  1  0.735  0.410  0.173  1.0
  B  B7  1  0.689  0.854  0.976  1.0
  B  B8  1  0.310  0.142  0.027  1.0
  B  B9  1  0.142  0.310  0.027  1.0
  B  B10  1  0.854  0.689  0.976  1.0
  B  B11  1  0.535  0.874  0.294  1.0
  B  B12  1  0.467  0.128  0.201  1.0
  B  B13  1  0.128  0.467  0.201  1.0
  B  B14  1  0.874  0.535  0.294  1.0
  B  B15  1  0.465  0.123  0.710  1.0
  B  B16  1  0.534  0.869  0.798  1.0
  B  B17  1  0.869  0.534  0.798  1.0
  B  B18  1  0.123  0.465  0.710  1.0
  B  B19  1  0.730  0.098  0.990  1.0
  B  B20  1  0.274  0.900  0.320  1.0
  B  B21  1  0.900  0.274  0.320  1.0
  B  B22  1  0.098  0.730  0.990  1.0
  B  B23  1  0.272  0.901  0.007  1.0
  B  B24  1  0.729  0.098  0.681  1.0
  B  B25  1  0.098  0.729  0.681  1.0
  B  B26  1  0.901  0.272  0.007  1.0
  B  B27  1  0.268  0.466  0.382  1.0
  B  B28  1  0.725  0.531  0.625  1.0
  B  B29  1  0.531  0.725  0.625  1.0
  B  B30  1  0.466  0.268  0.382  1.0
[/CIF]
.