The structure described by Sr2MnCu2AlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(7), two equivalent O(11), and two equivalent O(13) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(8), two equivalent O(12), and two equivalent O(14) atoms. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(9), two equivalent O(11), and two equivalent O(13) atoms. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(6), two equivalent O(12), and two equivalent O(14) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted tetrahedral geometry to one O(1), one O(11), one O(14), and one O(2) atom. In the second Mn site, Mn(2) is bonded in a distorted see-saw-like geometry to one O(1), one O(12), one O(13), and one O(2) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to one O(13), one O(3), one O(5), one O(7), and one O(9) atom. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(14), one O(4), one O(6), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(3), one O(5), one O(7), and one O(9) atom. In the fourth Cu site, Cu(4) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(12), one O(4), one O(6), and one O(8) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted tetrahedral geometry to one O(10), one O(5), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded in a distorted tetrahedral geometry to one O(3), one O(4), one O(7), and one O(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted corner-sharing OSr2Mn2 tetrahedra. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Mn(1), and one Mn(2) atom to form distorted corner-sharing OSr2Mn2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(1), and one Cu(3) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(2), and one Cu(4) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(2), and one Cu(1) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(1), and one Cu(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2MnAlCu2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.326
_cell_length_b   5.320
_cell_length_c   12.263
_cell_angle_alpha   102.503
_cell_angle_beta   102.463
_cell_angle_gamma   89.996
_symmetry_Int_Tables_number   1
_cell_volume   330.823
_cell_formula_units_Z   2
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
  Sr  Sr0  1  0.328  0.341  0.703  1.0
  Sr  Sr1  1  0.631  0.650  0.296  1.0
  Sr  Sr2  1  0.828  0.855  0.703  1.0
  Sr  Sr3  1  0.131  0.140  0.296  1.0
  Mn  Mn4  1  0.266  0.691  0.499  1.0
  Mn  Mn5  1  0.766  0.305  0.499  1.0
  Al  Al6  1  0.984  0.011  0.999  1.0
  Al  Al7  1  0.483  0.495  0.999  1.0
  Cu  Cu8  1  0.918  0.445  0.883  1.0
  Cu  Cu9  1  0.044  0.561  0.115  1.0
  Cu  Cu10  1  0.420  0.939  0.883  1.0
  Cu  Cu11  1  0.544  0.057  0.116  1.0
  O  O12  1  0.128  0.337  0.499  1.0
  O  O13  1  0.627  0.659  0.499  1.0
  O  O14  1  0.244  0.266  0.894  1.0
  O  O15  1  0.364  0.729  0.107  1.0
  O  O16  1  0.745  0.125  0.892  1.0
  O  O17  1  0.862  0.877  0.105  1.0
  O  O18  1  0.596  0.618  0.889  1.0
  O  O19  1  0.719  0.375  0.106  1.0
  O  O20  1  0.100  0.772  0.892  1.0
  O  O21  1  0.218  0.234  0.109  1.0
  O  O22  1  0.299  0.838  0.658  1.0
  O  O23  1  0.645  0.159  0.341  1.0
  O  O24  1  0.801  0.317  0.658  1.0
  O  O25  1  0.144  0.680  0.341  1.0
[/CIF]
.
The structure described by Sr2MnCu2AlO7 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one O(1), one O(3), one O(7), two equivalent O(11), and two equivalent O(13) atoms. In the second Sr site, Sr(2) is bonded in a 7-coordinate geometry to one O(2), one O(4), one O(8), two equivalent O(12), and two equivalent O(14) atoms. In the third Sr site, Sr(3) is bonded in a 7-coordinate geometry to one O(2), one O(5), one O(9), two equivalent O(11), and two equivalent O(13) atoms. In the fourth Sr site, Sr(4) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(6), two equivalent O(12), and two equivalent O(14) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted tetrahedral geometry to one O(1), one O(11), one O(14), and one O(2) atom. In the second Mn site, Mn(2) is bonded in a distorted see-saw-like geometry to one O(1), one O(12), one O(13), and one O(2) atom. There are four inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a distorted square co-planar geometry to one O(13), one O(3), one O(5), one O(7), and one O(9) atom. In the second Cu site, Cu(2) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(14), one O(4), one O(6), and one O(8) atom. In the third Cu site, Cu(3) is bonded in a distorted rectangular see-saw-like geometry to one O(11), one O(3), one O(5), one O(7), and one O(9) atom. In the fourth Cu site, Cu(4) is bonded in a distorted rectangular see-saw-like geometry to one O(10), one O(12), one O(4), one O(6), and one O(8) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a distorted tetrahedral geometry to one O(10), one O(5), one O(6), and one O(9) atom. In the second Al site, Al(2) is bonded in a distorted tetrahedral geometry to one O(3), one O(4), one O(7), and one O(8) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded to one Sr(1), one Sr(4), one Mn(1), and one Mn(2) atom to form distorted corner-sharing OSr2Mn2 tetrahedra. In the second O site, O(2) is bonded to one Sr(2), one Sr(3), one Mn(1), and one Mn(2) atom to form distorted corner-sharing OSr2Mn2 tetrahedra. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Sr(1), one Cu(1), one Cu(3), and one Al(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Sr(2), one Cu(2), one Cu(4), and one Al(2) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Sr(3), one Cu(1), one Cu(3), and one Al(1) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Sr(4), one Cu(2), one Cu(4), and one Al(1) atom. In the eleventh O site, O(11) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(1), and one Cu(3) atom. In the twelfth O site, O(12) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(2), and one Cu(4) atom. In the thirteenth O site, O(13) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one Mn(2), and one Cu(1) atom. In the fourteenth O site, O(14) is bonded in a 6-coordinate geometry to two equivalent Sr(2), two equivalent Sr(4), one Mn(1), and one Cu(2) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr2MnAlCu2O7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.326
_cell_length_b   5.320
_cell_length_c   12.263
_cell_angle_alpha   102.503
_cell_angle_beta   102.463
_cell_angle_gamma   89.996
_symmetry_Int_Tables_number   1
_cell_volume   330.823
_cell_formula_units_Z   2
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
  Sr  Sr0  1  0.328  0.341  0.703  1.0
  Sr  Sr1  1  0.631  0.650  0.296  1.0
  Sr  Sr2  1  0.828  0.855  0.703  1.0
  Sr  Sr3  1  0.131  0.140  0.296  1.0
  Mn  Mn4  1  0.266  0.691  0.499  1.0
  Mn  Mn5  1  0.766  0.305  0.499  1.0
  Al  Al6  1  0.984  0.011  0.999  1.0
  Al  Al7  1  0.483  0.495  0.999  1.0
  Cu  Cu8  1  0.918  0.445  0.883  1.0
  Cu  Cu9  1  0.044  0.561  0.115  1.0
  Cu  Cu10  1  0.420  0.939  0.883  1.0
  Cu  Cu11  1  0.544  0.057  0.116  1.0
  O  O12  1  0.128  0.337  0.499  1.0
  O  O13  1  0.627  0.659  0.499  1.0
  O  O14  1  0.244  0.266  0.894  1.0
  O  O15  1  0.364  0.729  0.107  1.0
  O  O16  1  0.745  0.125  0.892  1.0
  O  O17  1  0.862  0.877  0.105  1.0
  O  O18  1  0.596  0.618  0.889  1.0
  O  O19  1  0.719  0.375  0.106  1.0
  O  O20  1  0.100  0.772  0.892  1.0
  O  O21  1  0.218  0.234  0.109  1.0
  O  O22  1  0.299  0.838  0.658  1.0
  O  O23  1  0.645  0.159  0.341  1.0
  O  O24  1  0.801  0.317  0.658  1.0
  O  O25  1  0.144  0.680  0.341  1.0
[/CIF]
.