The structure described by SrCr7N10 crystallizes in the monoclinic Pc space group. Sr(1) is bonded in a 5-coordinate geometry to one N(2), one N(4), one N(7), and two equivalent N(1) atoms. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), one N(3), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(2), one N(3), one N(4), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(4), one N(5), one N(7), and one N(8) atom to form corner-sharing CrN4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(2), one N(7), and one N(9) atom to form corner-sharing CrN4 tetrahedra. In the fifth Cr site, Cr(5) is bonded to one N(1), one N(7), one N(8), and one N(9) atom to form corner-sharing CrN4 tetrahedra. In the sixth Cr site, Cr(6) is bonded to one N(10), one N(3), one N(5), and one N(8) atom to form corner-sharing CrN4 tetrahedra. In the seventh Cr site, Cr(7) is bonded to one N(10), one N(5), one N(6), and one N(9) atom to form corner-sharing CrN4 tetrahedra. There are ten inequivalent N sites. In the first N site, N(9) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(5), and one Cr(7) atom. In the second N site, N(10) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(6), and one Cr(7) atom. In the third N site, N(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(1), one Cr(1), and one Cr(5) atom. In the fourth N site, N(2) is bonded in a 4-coordinate geometry to one Sr(1), one Cr(1), one Cr(2), and one Cr(4) atom. In the fifth N site, N(3) is bonded in a distorted T-shaped geometry to one Cr(1), one Cr(2), and one Cr(6) atom. In the sixth N site, N(4) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(2), and one Cr(3) atom. In the seventh N site, N(5) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(6), and one Cr(7) atom. In the eighth N site, N(6) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(7) atom. In the ninth N site, N(7) is bonded in a distorted trigonal pyramidal geometry to one Sr(1), one Cr(3), one Cr(4), and one Cr(5) atom. In the tenth N site, N(8) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(5), and one Cr(6) atom. is represented by the CIF card [CIF]
data_SrCr7N10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.094
_cell_length_b   6.860
_cell_length_c   10.272
_cell_angle_alpha   90.000
_cell_angle_beta   104.526
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   483.951
_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  0.910  0.031  0.609  1.0
  Sr  Sr1  1  0.910  0.969  0.109  1.0
  Cr  Cr2  1  0.545  0.016  0.832  1.0
  Cr  Cr3  1  0.545  0.984  0.332  1.0
  Cr  Cr4  1  0.360  0.021  0.015  1.0
  Cr  Cr5  1  0.360  0.979  0.515  1.0
  Cr  Cr6  1  0.097  0.414  0.075  1.0
  Cr  Cr7  1  0.097  0.586  0.575  1.0
  Cr  Cr8  1  0.680  0.387  0.976  1.0
  Cr  Cr9  1  0.680  0.613  0.476  1.0
  Cr  Cr10  1  0.866  0.652  0.814  1.0
  Cr  Cr11  1  0.866  0.348  0.314  1.0
  Cr  Cr12  1  0.313  0.614  0.901  1.0
  Cr  Cr13  1  0.313  0.386  0.401  1.0
  Cr  Cr14  1  0.461  0.381  0.694  1.0
  Cr  Cr15  1  0.461  0.619  0.194  1.0
  N  N16  1  0.758  0.883  0.836  1.0
  N  N17  1  0.758  0.117  0.336  1.0
  N  N18  1  0.569  0.153  0.993  1.0
  N  N19  1  0.569  0.847  0.493  1.0
  N  N20  1  0.348  0.867  0.865  1.0
  N  N21  1  0.348  0.133  0.365  1.0
  N  N22  1  0.173  0.183  0.025  1.0
  N  N23  1  0.173  0.817  0.525  1.0
  N  N24  1  0.251  0.496  0.734  1.0
  N  N25  1  0.251  0.504  0.234  1.0
  N  N26  1  0.428  0.121  0.669  1.0
  N  N27  1  0.428  0.879  0.169  1.0
  N  N28  1  0.882  0.361  0.138  1.0
  N  N29  1  0.882  0.639  0.638  1.0
  N  N30  1  0.080  0.605  0.949  1.0
  N  N31  1  0.080  0.395  0.449  1.0
  N  N32  1  0.688  0.466  0.805  1.0
  N  N33  1  0.688  0.534  0.305  1.0
  N  N34  1  0.533  0.550  0.040  1.0
  N  N35  1  0.533  0.450  0.540  1.0
[/CIF]
.
The structure described by SrCr7N10 crystallizes in the monoclinic Pc space group. Sr(1) is bonded in a 5-coordinate geometry to one N(2), one N(4), one N(7), and two equivalent N(1) atoms. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), one N(3), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(2), one N(3), one N(4), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(4), one N(5), one N(7), and one N(8) atom to form corner-sharing CrN4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(2), one N(7), and one N(9) atom to form corner-sharing CrN4 tetrahedra. In the fifth Cr site, Cr(5) is bonded to one N(1), one N(7), one N(8), and one N(9) atom to form corner-sharing CrN4 tetrahedra. In the sixth Cr site, Cr(6) is bonded to one N(10), one N(3), one N(5), and one N(8) atom to form corner-sharing CrN4 tetrahedra. In the seventh Cr site, Cr(7) is bonded to one N(10), one N(5), one N(6), and one N(9) atom to form corner-sharing CrN4 tetrahedra. There are ten inequivalent N sites. In the first N site, N(9) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(5), and one Cr(7) atom. In the second N site, N(10) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(6), and one Cr(7) atom. In the third N site, N(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(1), one Cr(1), and one Cr(5) atom. In the fourth N site, N(2) is bonded in a 4-coordinate geometry to one Sr(1), one Cr(1), one Cr(2), and one Cr(4) atom. In the fifth N site, N(3) is bonded in a distorted T-shaped geometry to one Cr(1), one Cr(2), and one Cr(6) atom. In the sixth N site, N(4) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(2), and one Cr(3) atom. In the seventh N site, N(5) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(6), and one Cr(7) atom. In the eighth N site, N(6) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(7) atom. In the ninth N site, N(7) is bonded in a distorted trigonal pyramidal geometry to one Sr(1), one Cr(3), one Cr(4), and one Cr(5) atom. In the tenth N site, N(8) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(5), and one Cr(6) atom. is represented by the CIF card [CIF]
data_SrCr7N10
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.094
_cell_length_b   6.860
_cell_length_c   10.272
_cell_angle_alpha   90.000
_cell_angle_beta   104.526
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   483.951
_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  0.910  0.031  0.609  1.0
  Sr  Sr1  1  0.910  0.969  0.109  1.0
  Cr  Cr2  1  0.545  0.016  0.832  1.0
  Cr  Cr3  1  0.545  0.984  0.332  1.0
  Cr  Cr4  1  0.360  0.021  0.015  1.0
  Cr  Cr5  1  0.360  0.979  0.515  1.0
  Cr  Cr6  1  0.097  0.414  0.075  1.0
  Cr  Cr7  1  0.097  0.586  0.575  1.0
  Cr  Cr8  1  0.680  0.387  0.976  1.0
  Cr  Cr9  1  0.680  0.613  0.476  1.0
  Cr  Cr10  1  0.866  0.652  0.814  1.0
  Cr  Cr11  1  0.866  0.348  0.314  1.0
  Cr  Cr12  1  0.313  0.614  0.901  1.0
  Cr  Cr13  1  0.313  0.386  0.401  1.0
  Cr  Cr14  1  0.461  0.381  0.694  1.0
  Cr  Cr15  1  0.461  0.619  0.194  1.0
  N  N16  1  0.758  0.883  0.836  1.0
  N  N17  1  0.758  0.117  0.336  1.0
  N  N18  1  0.569  0.153  0.993  1.0
  N  N19  1  0.569  0.847  0.493  1.0
  N  N20  1  0.348  0.867  0.865  1.0
  N  N21  1  0.348  0.133  0.365  1.0
  N  N22  1  0.173  0.183  0.025  1.0
  N  N23  1  0.173  0.817  0.525  1.0
  N  N24  1  0.251  0.496  0.734  1.0
  N  N25  1  0.251  0.504  0.234  1.0
  N  N26  1  0.428  0.121  0.669  1.0
  N  N27  1  0.428  0.879  0.169  1.0
  N  N28  1  0.882  0.361  0.138  1.0
  N  N29  1  0.882  0.639  0.638  1.0
  N  N30  1  0.080  0.605  0.949  1.0
  N  N31  1  0.080  0.395  0.449  1.0
  N  N32  1  0.688  0.466  0.805  1.0
  N  N33  1  0.688  0.534  0.305  1.0
  N  N34  1  0.533  0.550  0.040  1.0
  N  N35  1  0.533  0.450  0.540  1.0
[/CIF]
.