Sr2MnO3Cl crystallizes in the tetragonal P4/nmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent Cl(1) atoms. Mn(1) is bonded to one O(2), four equivalent O(1), and one Cl(1) atom to form distorted corner-sharing MnClO5 square pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded to five equivalent Sr(1) and one Mn(1) atom to form a mixture of distorted edge and corner-sharing OSr5Mn octahedra. The corner-sharing octahedral tilt angles are 10°. Cl(1) is bonded in a 6-coordinate geometry to five equivalent Sr(2) and one Mn(1) atom.
Sr2MnO3Cl crystallizes in the tetragonal P4/nmm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent O(2) atoms. All Sr(1)-O(1) bond lengths are 2.86 Å. There is one shorter (2.45 Å) and four longer (2.78 Å) Sr(1)-O(2) bond lengths. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to four equivalent O(1) and five equivalent Cl(1) atoms. All Sr(2)-O(1) bond lengths are 2.56 Å. There are four shorter (3.02 Å) and one longer (3.51 Å) Sr(2)-Cl(1) bond length. Mn(1) is bonded to one O(2), four equivalent O(1), and one Cl(1) atom to form distorted corner-sharing MnClO5 square pyramids. The Mn(1)-O(2) bond length is 2.03 Å. All Mn(1)-O(1) bond lengths are 1.98 Å. The Mn(1)-Cl(1) bond length is 3.16 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded to five equivalent Sr(1) and one Mn(1) atom to form a mixture of distorted edge and corner-sharing OSr5Mn octahedra. The corner-sharing octahedral tilt angles are 10°. Cl(1) is bonded in a 6-coordinate geometry to five equivalent Sr(2) and one Mn(1) atom.