Sr7Mn4O15 crystallizes in the monoclinic Pc space group. There are seven inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(13), one O(15), one O(2), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(12), one O(14), one O(15), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(14), one O(3), one O(5), one O(7), and two equivalent O(9) atoms. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(2), one O(4), one O(6), one O(8), and two equivalent O(10) atoms. In the fifth Sr site, Sr(5) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(14), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. In the sixth Sr site, Sr(6) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(15), one O(6), one O(7), one O(9), and two equivalent O(3) atoms. In the seventh Sr site, Sr(7) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(15), one O(2), one O(5), one O(8), and two equivalent O(4) atoms. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(13), one O(5), one O(7), and one O(9) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 19°. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(14), one O(2), one O(6), and one O(8) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 17°. In the third Mn site, Mn(3) is bonded to one O(1), one O(11), one O(15), one O(3), one O(5), and one O(7) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 4-19°. In the fourth Mn site, Mn(4) is bonded to one O(12), one O(15), one O(2), one O(4), one O(6), and one O(8) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 4-17°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Mn(1), and one Mn(3) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(4), one Sr(5), one Sr(7), one Mn(2), and one Mn(4) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(3), one Sr(5), two equivalent Sr(6), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), two equivalent Sr(7), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(7), one Mn(1), and one Mn(3) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(6), one Mn(2), and one Mn(4) atom. In the seventh O site, O(7) is bonded to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Mn(1), and one Mn(3) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 3-66°. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(4), one Sr(5), one Sr(7), one Mn(2), and one Mn(4) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 3-69°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(6), two equivalent Sr(3), and one Mn(1) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), two equivalent Sr(4), and one Mn(2) atom. In the eleventh O site, O(11) is bonded to one Sr(1), one Sr(5), one Sr(6), one Sr(7), one Mn(1), and one Mn(3) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-66°. In the twelfth O site, O(12) is bonded to one Sr(2), one Sr(5), one Sr(6), one Sr(7), one Mn(2), and one Mn(4) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the thirteenth O site, O(13) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Sr(5), one Sr(7), and one Mn(1) atom. In the fourteenth O site, O(14) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Sr(5), one Sr(6), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to one Sr(1), one Sr(2), one Sr(6), one Sr(7), one Mn(3), and one Mn(4) atom.
Sr7Mn4O15 crystallizes in the monoclinic Pc space group. There are seven inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(13), one O(15), one O(2), one O(3), one O(5), one O(6), one O(8), and one O(9) atom. The Sr(1)-O(10) bond length is 2.86 Å. The Sr(1)-O(11) bond length is 2.64 Å. The Sr(1)-O(13) bond length is 3.21 Å. The Sr(1)-O(15) bond length is 2.73 Å. The Sr(1)-O(2) bond length is 2.53 Å. The Sr(1)-O(3) bond length is 2.92 Å. The Sr(1)-O(5) bond length is 2.54 Å. The Sr(1)-O(6) bond length is 3.10 Å. The Sr(1)-O(8) bond length is 2.69 Å. The Sr(1)-O(9) bond length is 2.97 Å. In the second Sr site, Sr(2) is bonded in a 10-coordinate geometry to one O(1), one O(10), one O(12), one O(14), one O(15), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The Sr(2)-O(1) bond length is 2.52 Å. The Sr(2)-O(10) bond length is 2.92 Å. The Sr(2)-O(12) bond length is 2.61 Å. The Sr(2)-O(14) bond length is 3.19 Å. The Sr(2)-O(15) bond length is 2.86 Å. The Sr(2)-O(4) bond length is 2.91 Å. The Sr(2)-O(5) bond length is 3.15 Å. The Sr(2)-O(6) bond length is 2.53 Å. The Sr(2)-O(7) bond length is 2.70 Å. The Sr(2)-O(9) bond length is 2.86 Å. In the third Sr site, Sr(3) is bonded in a 8-coordinate geometry to one O(1), one O(13), one O(14), one O(3), one O(5), one O(7), and two equivalent O(9) atoms. The Sr(3)-O(1) bond length is 2.71 Å. The Sr(3)-O(13) bond length is 2.59 Å. The Sr(3)-O(14) bond length is 2.46 Å. The Sr(3)-O(3) bond length is 2.43 Å. The Sr(3)-O(5) bond length is 2.64 Å. The Sr(3)-O(7) bond length is 2.55 Å. There is one shorter (2.66 Å) and one longer (2.79 Å) Sr(3)-O(9) bond length. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(2), one O(4), one O(6), one O(8), and two equivalent O(10) atoms. The Sr(4)-O(13) bond length is 2.47 Å. The Sr(4)-O(14) bond length is 2.60 Å. The Sr(4)-O(2) bond length is 2.68 Å. The Sr(4)-O(4) bond length is 2.43 Å. The Sr(4)-O(6) bond length is 2.65 Å. The Sr(4)-O(8) bond length is 2.55 Å. There is one shorter (2.66 Å) and one longer (2.80 Å) Sr(4)-O(10) bond length. In the fifth Sr site, Sr(5) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(13), one O(14), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. The Sr(5)-O(1) bond length is 3.07 Å. The Sr(5)-O(11) bond length is 2.77 Å. The Sr(5)-O(12) bond length is 2.96 Å. The Sr(5)-O(13) bond length is 2.63 Å. The Sr(5)-O(14) bond length is 2.67 Å. The Sr(5)-O(2) bond length is 3.15 Å. The Sr(5)-O(3) bond length is 2.72 Å. The Sr(5)-O(4) bond length is 2.80 Å. The Sr(5)-O(7) bond length is 2.75 Å. The Sr(5)-O(8) bond length is 2.75 Å. In the sixth Sr site, Sr(6) is bonded in a 10-coordinate geometry to one O(1), one O(11), one O(12), one O(14), one O(15), one O(6), one O(7), one O(9), and two equivalent O(3) atoms. The Sr(6)-O(1) bond length is 2.69 Å. The Sr(6)-O(11) bond length is 2.73 Å. The Sr(6)-O(12) bond length is 2.65 Å. The Sr(6)-O(14) bond length is 2.87 Å. The Sr(6)-O(15) bond length is 2.81 Å. The Sr(6)-O(6) bond length is 2.74 Å. The Sr(6)-O(7) bond length is 2.69 Å. The Sr(6)-O(9) bond length is 2.46 Å. There is one shorter (2.74 Å) and one longer (2.92 Å) Sr(6)-O(3) bond length. In the seventh Sr site, Sr(7) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(13), one O(15), one O(2), one O(5), one O(8), and two equivalent O(4) atoms. The Sr(7)-O(10) bond length is 2.46 Å. The Sr(7)-O(11) bond length is 2.71 Å. The Sr(7)-O(12) bond length is 2.73 Å. The Sr(7)-O(13) bond length is 2.92 Å. The Sr(7)-O(15) bond length is 2.72 Å. The Sr(7)-O(2) bond length is 2.70 Å. The Sr(7)-O(5) bond length is 2.77 Å. The Sr(7)-O(8) bond length is 2.67 Å. There is one shorter (2.73 Å) and one longer (2.90 Å) Sr(7)-O(4) bond length. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(13), one O(5), one O(7), and one O(9) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 19°. The Mn(1)-O(1) bond length is 1.91 Å. The Mn(1)-O(11) bond length is 2.04 Å. The Mn(1)-O(13) bond length is 1.86 Å. The Mn(1)-O(5) bond length is 1.95 Å. The Mn(1)-O(7) bond length is 2.10 Å. The Mn(1)-O(9) bond length is 1.87 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(14), one O(2), one O(6), and one O(8) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 17°. The Mn(2)-O(10) bond length is 1.88 Å. The Mn(2)-O(12) bond length is 2.04 Å. The Mn(2)-O(14) bond length is 1.86 Å. The Mn(2)-O(2) bond length is 1.89 Å. The Mn(2)-O(6) bond length is 1.95 Å. The Mn(2)-O(8) bond length is 2.11 Å. In the third Mn site, Mn(3) is bonded to one O(1), one O(11), one O(15), one O(3), one O(5), and one O(7) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 4-19°. The Mn(3)-O(1) bond length is 1.89 Å. The Mn(3)-O(11) bond length is 1.98 Å. The Mn(3)-O(15) bond length is 1.90 Å. The Mn(3)-O(3) bond length is 1.86 Å. The Mn(3)-O(5) bond length is 2.05 Å. The Mn(3)-O(7) bond length is 1.95 Å. In the fourth Mn site, Mn(4) is bonded to one O(12), one O(15), one O(2), one O(4), one O(6), and one O(8) atom to form a mixture of face and corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 4-17°. The Mn(4)-O(12) bond length is 1.96 Å. The Mn(4)-O(15) bond length is 1.90 Å. The Mn(4)-O(2) bond length is 1.90 Å. The Mn(4)-O(4) bond length is 1.86 Å. The Mn(4)-O(6) bond length is 2.07 Å. The Mn(4)-O(8) bond length is 1.94 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Mn(1), and one Mn(3) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(4), one Sr(5), one Sr(7), one Mn(2), and one Mn(4) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(3), one Sr(5), two equivalent Sr(6), and one Mn(3) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one Sr(2), one Sr(4), one Sr(5), two equivalent Sr(7), and one Mn(4) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Sr(7), one Mn(1), and one Mn(3) atom. In the sixth O site, O(6) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(6), one Mn(2), and one Mn(4) atom. In the seventh O site, O(7) is bonded to one Sr(2), one Sr(3), one Sr(5), one Sr(6), one Mn(1), and one Mn(3) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 3-66°. In the eighth O site, O(8) is bonded to one Sr(1), one Sr(4), one Sr(5), one Sr(7), one Mn(2), and one Mn(4) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 3-69°. In the ninth O site, O(9) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(6), two equivalent Sr(3), and one Mn(1) atom. In the tenth O site, O(10) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(7), two equivalent Sr(4), and one Mn(2) atom. In the eleventh O site, O(11) is bonded to one Sr(1), one Sr(5), one Sr(6), one Sr(7), one Mn(1), and one Mn(3) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-66°. In the twelfth O site, O(12) is bonded to one Sr(2), one Sr(5), one Sr(6), one Sr(7), one Mn(2), and one Mn(4) atom to form a mixture of distorted face and corner-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 1-69°. In the thirteenth O site, O(13) is bonded in a 1-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Sr(5), one Sr(7), and one Mn(1) atom. In the fourteenth O site, O(14) is bonded in a 1-coordinate geometry to one Sr(2), one Sr(3), one Sr(4), one Sr(5), one Sr(6), and one Mn(2) atom. In the fifteenth O site, O(15) is bonded in a distorted linear geometry to one Sr(1), one Sr(2), one Sr(6), one Sr(7), one Mn(3), and one Mn(4) atom.