Mn3Cu(SeO3)4 crystallizes in the triclinic P-1 space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Cu(1)O6 octahedra and corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-55°. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with four equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. Cu(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form CuO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra and corners with four equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-55°. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(3), and one O(5) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(2), one O(4), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(3), one Cu(1), 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 trigonal planar geometry to one Mn(1), one Mn(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(3), one Cu(1), and one Se(2) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Mn(2), one Cu(1), and one Se(1) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Mn(1), one Mn(3), and one Se(2) atom.
Mn3Cu(SeO3)4 crystallizes in the triclinic P-1 space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(6) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles range from 51-59°. Both Mn(1)-O(2) bond lengths are 2.31 Å. Both Mn(1)-O(3) bond lengths are 2.19 Å. Both Mn(1)-O(6) bond lengths are 2.23 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms to form MnO6 octahedra that share corners with two equivalent Cu(1)O6 octahedra and corners with four equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-55°. Both Mn(2)-O(2) bond lengths are 2.15 Å. Both Mn(2)-O(3) bond lengths are 2.36 Å. Both Mn(2)-O(5) bond lengths are 2.27 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(6) atoms to form MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra and corners with four equivalent Cu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-59°. Both Mn(3)-O(1) bond lengths are 2.08 Å. Both Mn(3)-O(4) bond lengths are 2.37 Å. Both Mn(3)-O(6) bond lengths are 2.29 Å. Cu(1) is bonded to two equivalent O(1), two equivalent O(4), and two equivalent O(5) atoms to form CuO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra and corners with four equivalent Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-55°. Both Cu(1)-O(1) bond lengths are 2.46 Å. Both Cu(1)-O(4) bond lengths are 2.02 Å. Both Cu(1)-O(5) bond lengths are 2.17 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(3), and one O(5) atom. The Se(1)-O(1) bond length is 1.73 Å. The Se(1)-O(3) bond length is 1.76 Å. The Se(1)-O(5) bond length is 1.77 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(2), one O(4), and one O(6) atom. The Se(2)-O(2) bond length is 1.76 Å. The Se(2)-O(4) bond length is 1.77 Å. The Se(2)-O(6) bond length is 1.74 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(3), one Cu(1), 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 trigonal planar geometry to one Mn(1), one Mn(2), and one Se(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mn(3), one Cu(1), and one Se(2) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Mn(2), one Cu(1), and one Se(1) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Mn(1), one Mn(3), and one Se(2) atom.