The material described by Sr9(MnN4)2 crystallizes in the monoclinic C2/m space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a linear geometry to two equivalent N(4) atoms. In the second Sr site, Sr(2) is bonded to one N(2), two equivalent N(1), and two equivalent N(4) atoms to form distorted SrN5 trigonal bipyramids that share  a cornercorner with one Sr(3)N5 trigonal bipyramid, corners with two equivalent Sr(2)N5 trigonal bipyramids, corners with two equivalent Sr(5)N4 trigonal pyramids,  an edgeedge with one Sr(2)N5 trigonal bipyramid, and edges with two equivalent Sr(3)N5 trigonal bipyramids. In the third Sr site, Sr(3) is bonded to one N(3), one N(4), and three equivalent N(2) atoms to form distorted SrN5 trigonal bipyramids that share  a cornercorner with one Sr(2)N5 trigonal bipyramid, corners with two equivalent Sr(3)N5 trigonal bipyramids, corners with three equivalent Sr(5)N4 trigonal pyramids, edges with two equivalent Sr(2)N5 trigonal bipyramids, and edges with two equivalent Sr(3)N5 trigonal bipyramids. In the fourth Sr site, Sr(4) is bonded in a rectangular see-saw-like geometry to two equivalent N(1) and two equivalent N(4) atoms. In the fifth Sr site, Sr(5) is bonded to one N(1) and three equivalent N(3) atoms to form distorted SrN4 trigonal pyramids that share corners with two equivalent Sr(2)N5 trigonal bipyramids, corners with three equivalent Sr(3)N5 trigonal bipyramids, corners with two equivalent Sr(5)N4 trigonal pyramids, and edges with two equivalent Sr(5)N4 trigonal pyramids. Mn(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to one Sr(5), two equivalent Sr(2), two equivalent Sr(4), and one Mn(1) atom. In the second N site, N(2) is bonded to one Sr(2), three equivalent Sr(3), and one Mn(1) atom to form distorted NSr4Mn trigonal bipyramids that share  a cornercorner with one N(4)Sr6 octahedra, corners with two equivalent N(2)Sr4Mn trigonal bipyramids, corners with two equivalent N(3)Sr4Mn trigonal bipyramids, edges with two equivalent N(4)Sr6 octahedra,  an edgeedge with one N(3)Sr4Mn trigonal bipyramid, and edges with two equivalent N(2)Sr4Mn trigonal bipyramids. The corner-sharing octahedral tilt angles are 12°. In the third N site, N(3) is bonded to one Sr(3), three equivalent Sr(5), and one Mn(1) atom to form distorted NSr4Mn trigonal bipyramids that share  a cornercorner with one N(4)Sr6 octahedra, corners with two equivalent N(2)Sr4Mn trigonal bipyramids, corners with two equivalent N(3)Sr4Mn trigonal bipyramids,  an edgeedge with one N(2)Sr4Mn trigonal bipyramid, and edges with two equivalent N(3)Sr4Mn trigonal bipyramids. The corner-sharing octahedral tilt angles are 53°. In the fourth N site, N(4) is bonded to one Sr(1), one Sr(3), two equivalent Sr(2), and two equivalent Sr(4) atoms to form NSr6 octahedra that share corners with three equivalent N(4)Sr6 octahedra,  a cornercorner with one N(2)Sr4Mn trigonal bipyramid,  a cornercorner with one N(3)Sr4Mn trigonal bipyramid,  an edgeedge with one N(4)Sr6 octahedra, and edges with two equivalent N(2)Sr4Mn trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-4°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr9(MnN4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.503
_cell_length_b   5.208
_cell_length_c   8.415
_cell_angle_alpha   90.000
_cell_angle_beta   68.719
_cell_angle_gamma   75.645
_symmetry_Int_Tables_number   1
_cell_volume   413.462
_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
  Sr  Sr0  1  0.000  0.500  0.500  1.0
  Sr  Sr1  1  0.083  0.958  0.756  1.0
  Sr  Sr2  1  0.917  0.042  0.244  1.0
  Sr  Sr3  1  0.651  0.674  0.455  1.0
  Sr  Sr4  1  0.349  0.326  0.545  1.0
  Sr  Sr5  1  0.829  0.586  0.989  1.0
  Sr  Sr6  1  0.171  0.414  0.011  1.0
  Sr  Sr7  1  0.393  0.803  0.170  1.0
  Sr  Sr8  1  0.607  0.197  0.830  1.0
  Mn  Mn9  1  0.381  0.810  0.802  1.0
  Mn  Mn10  1  0.619  0.190  0.198  1.0
  N  N11  1  0.227  0.887  0.983  1.0
  N  N12  1  0.773  0.113  0.017  1.0
  N  N13  1  0.369  0.815  0.605  1.0
  N  N14  1  0.631  0.185  0.395  1.0
  N  N15  1  0.542  0.729  0.824  1.0
  N  N16  1  0.458  0.271  0.176  1.0
  N  N17  1  0.925  0.537  0.243  1.0
  N  N18  1  0.075  0.463  0.757  1.0
[/CIF]
.
The material described by Sr9(MnN4)2 crystallizes in the monoclinic C2/m space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a linear geometry to two equivalent N(4) atoms. In the second Sr site, Sr(2) is bonded to one N(2), two equivalent N(1), and two equivalent N(4) atoms to form distorted SrN5 trigonal bipyramids that share  a cornercorner with one Sr(3)N5 trigonal bipyramid, corners with two equivalent Sr(2)N5 trigonal bipyramids, corners with two equivalent Sr(5)N4 trigonal pyramids,  an edgeedge with one Sr(2)N5 trigonal bipyramid, and edges with two equivalent Sr(3)N5 trigonal bipyramids. In the third Sr site, Sr(3) is bonded to one N(3), one N(4), and three equivalent N(2) atoms to form distorted SrN5 trigonal bipyramids that share  a cornercorner with one Sr(2)N5 trigonal bipyramid, corners with two equivalent Sr(3)N5 trigonal bipyramids, corners with three equivalent Sr(5)N4 trigonal pyramids, edges with two equivalent Sr(2)N5 trigonal bipyramids, and edges with two equivalent Sr(3)N5 trigonal bipyramids. In the fourth Sr site, Sr(4) is bonded in a rectangular see-saw-like geometry to two equivalent N(1) and two equivalent N(4) atoms. In the fifth Sr site, Sr(5) is bonded to one N(1) and three equivalent N(3) atoms to form distorted SrN4 trigonal pyramids that share corners with two equivalent Sr(2)N5 trigonal bipyramids, corners with three equivalent Sr(3)N5 trigonal bipyramids, corners with two equivalent Sr(5)N4 trigonal pyramids, and edges with two equivalent Sr(5)N4 trigonal pyramids. Mn(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to one Sr(5), two equivalent Sr(2), two equivalent Sr(4), and one Mn(1) atom. In the second N site, N(2) is bonded to one Sr(2), three equivalent Sr(3), and one Mn(1) atom to form distorted NSr4Mn trigonal bipyramids that share  a cornercorner with one N(4)Sr6 octahedra, corners with two equivalent N(2)Sr4Mn trigonal bipyramids, corners with two equivalent N(3)Sr4Mn trigonal bipyramids, edges with two equivalent N(4)Sr6 octahedra,  an edgeedge with one N(3)Sr4Mn trigonal bipyramid, and edges with two equivalent N(2)Sr4Mn trigonal bipyramids. The corner-sharing octahedral tilt angles are 12°. In the third N site, N(3) is bonded to one Sr(3), three equivalent Sr(5), and one Mn(1) atom to form distorted NSr4Mn trigonal bipyramids that share  a cornercorner with one N(4)Sr6 octahedra, corners with two equivalent N(2)Sr4Mn trigonal bipyramids, corners with two equivalent N(3)Sr4Mn trigonal bipyramids,  an edgeedge with one N(2)Sr4Mn trigonal bipyramid, and edges with two equivalent N(3)Sr4Mn trigonal bipyramids. The corner-sharing octahedral tilt angles are 53°. In the fourth N site, N(4) is bonded to one Sr(1), one Sr(3), two equivalent Sr(2), and two equivalent Sr(4) atoms to form NSr6 octahedra that share corners with three equivalent N(4)Sr6 octahedra,  a cornercorner with one N(2)Sr4Mn trigonal bipyramid,  a cornercorner with one N(3)Sr4Mn trigonal bipyramid,  an edgeedge with one N(4)Sr6 octahedra, and edges with two equivalent N(2)Sr4Mn trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-4°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sr9(MnN4)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.503
_cell_length_b   5.208
_cell_length_c   8.415
_cell_angle_alpha   90.000
_cell_angle_beta   68.719
_cell_angle_gamma   75.645
_symmetry_Int_Tables_number   1
_cell_volume   413.462
_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
  Sr  Sr0  1  0.000  0.500  0.500  1.0
  Sr  Sr1  1  0.083  0.958  0.756  1.0
  Sr  Sr2  1  0.917  0.042  0.244  1.0
  Sr  Sr3  1  0.651  0.674  0.455  1.0
  Sr  Sr4  1  0.349  0.326  0.545  1.0
  Sr  Sr5  1  0.829  0.586  0.989  1.0
  Sr  Sr6  1  0.171  0.414  0.011  1.0
  Sr  Sr7  1  0.393  0.803  0.170  1.0
  Sr  Sr8  1  0.607  0.197  0.830  1.0
  Mn  Mn9  1  0.381  0.810  0.802  1.0
  Mn  Mn10  1  0.619  0.190  0.198  1.0
  N  N11  1  0.227  0.887  0.983  1.0
  N  N12  1  0.773  0.113  0.017  1.0
  N  N13  1  0.369  0.815  0.605  1.0
  N  N14  1  0.631  0.185  0.395  1.0
  N  N15  1  0.542  0.729  0.824  1.0
  N  N16  1  0.458  0.271  0.176  1.0
  N  N17  1  0.925  0.537  0.243  1.0
  N  N18  1  0.075  0.463  0.757  1.0
[/CIF]
.