Mn4Se4O15 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. In the second Mn site, Mn(2) is bonded to one O(1), one O(13), one O(2), one O(5), one O(6), and one O(7) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. In the third Mn site, Mn(3) is bonded to one O(10), one O(11), one O(14), one O(7), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(11), one O(15), one O(4), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(11), and one O(9) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(12), one O(2), and one O(8) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(10), one O(5), and one O(6) atom. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(4), and one O(7) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Se(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one Mn(1) and one Se(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(4), and one Se(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Se(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Se(3) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Mn(2), one Mn(3), and one Se(4) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one Se(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one Se(1) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one Se(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Mn(3), one Mn(4), and one Se(1) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Se(2) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Mn(2) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one Mn(3) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one Mn(4) atom.
Mn4Se4O15 crystallizes in the monoclinic P2_1 space group. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. The Mn(1)-O(1) bond length is 2.14 Å. The Mn(1)-O(2) bond length is 2.19 Å. The Mn(1)-O(3) bond length is 2.10 Å. The Mn(1)-O(4) bond length is 2.28 Å. The Mn(1)-O(5) bond length is 2.11 Å. The Mn(1)-O(6) bond length is 2.38 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(13), one O(2), one O(5), one O(6), and one O(7) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. The Mn(2)-O(1) bond length is 2.07 Å. The Mn(2)-O(13) bond length is 1.74 Å. The Mn(2)-O(2) bond length is 2.05 Å. The Mn(2)-O(5) bond length is 2.29 Å. The Mn(2)-O(6) bond length is 2.10 Å. The Mn(2)-O(7) bond length is 2.24 Å. In the third Mn site, Mn(3) is bonded to one O(10), one O(11), one O(14), one O(7), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. The Mn(3)-O(10) bond length is 2.10 Å. The Mn(3)-O(11) bond length is 2.32 Å. The Mn(3)-O(14) bond length is 1.75 Å. The Mn(3)-O(7) bond length is 2.09 Å. The Mn(3)-O(8) bond length is 2.11 Å. The Mn(3)-O(9) bond length is 2.16 Å. In the fourth Mn site, Mn(4) is bonded to one O(10), one O(11), one O(15), one O(4), one O(8), and one O(9) atom to form a mixture of distorted corner and edge-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. The Mn(4)-O(10) bond length is 2.22 Å. The Mn(4)-O(11) bond length is 2.21 Å. The Mn(4)-O(15) bond length is 1.75 Å. The Mn(4)-O(4) bond length is 2.05 Å. The Mn(4)-O(8) bond length is 2.14 Å. The Mn(4)-O(9) bond length is 2.10 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(11), and one O(9) atom. The Se(1)-O(1) bond length is 1.74 Å. The Se(1)-O(11) bond length is 1.73 Å. The Se(1)-O(9) bond length is 1.76 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(12), one O(2), and one O(8) atom. The Se(2)-O(12) bond length is 1.66 Å. The Se(2)-O(2) bond length is 1.81 Å. The Se(2)-O(8) bond length is 1.80 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(10), one O(5), and one O(6) atom. The Se(3)-O(10) bond length is 1.75 Å. The Se(3)-O(5) bond length is 1.73 Å. The Se(3)-O(6) bond length is 1.75 Å. In the fourth Se site, Se(4) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(4), and one O(7) atom. The Se(4)-O(3) bond length is 1.72 Å. The Se(4)-O(4) bond length is 1.77 Å. The Se(4)-O(7) bond length is 1.78 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Se(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Se(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one Mn(1) and one Se(4) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(4), and one Se(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Se(3) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Se(3) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Mn(2), one Mn(3), and one Se(4) atom. In the eighth O site, O(8) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one Se(2) atom. In the ninth O site, O(9) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one Se(1) atom. In the tenth O site, O(10) is bonded in a trigonal planar geometry to one Mn(3), one Mn(4), and one Se(3) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal non-coplanar geometry to one Mn(3), one Mn(4), and one Se(1) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Se(2) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Mn(2) atom. In the fourteenth O site, O(14) is bonded in a single-bond geometry to one Mn(3) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one Mn(4) atom.