Mn10CuN8 crystallizes in the monoclinic C2/m space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted T-shaped geometry to one N(1), one N(2), and one N(3) atom. In the second Mn site, Mn(2) is bonded to one N(2), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of edge and corner-sharing MnN5 square pyramids. In the third Mn site, Mn(3) is bonded to one N(3), one N(4), and three equivalent N(2) atoms to form a mixture of edge and corner-sharing MnN5 square pyramids. In the fourth Mn site, Mn(4) is bonded to one N(3), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of edge and corner-sharing MnN5 square pyramids. In the fifth Mn site, Mn(5) is bonded in a rectangular see-saw-like geometry to one N(1), one N(2), and two equivalent N(3) atoms. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent N(3) and two equivalent N(4) atoms. There are four inequivalent N sites. In the first N site, N(1) is bonded to one Mn(1), one Mn(5), two equivalent Mn(2), and two equivalent Mn(4) atoms to form NMn6 octahedra that share  a cornercorner with one N(3)Mn5Cu octahedra, corners with two equivalent N(1)Mn6 octahedra, corners with two equivalent N(2)Mn6 octahedra,  an edgeedge with one N(1)Mn6 octahedra,  an edgeedge with one N(2)Mn6 octahedra, edges with two equivalent N(3)Mn5Cu octahedra, and edges with four equivalent N(4)Mn5Cu octahedra. The corner-sharing octahedral tilt angles range from 2-28°. In the second N site, N(2) is bonded to one Mn(1), one Mn(2), one Mn(5), and three equivalent Mn(3) atoms to form NMn6 octahedra that share  a cornercorner with one N(4)Mn5Cu octahedra, corners with two equivalent N(1)Mn6 octahedra, corners with two equivalent N(2)Mn6 octahedra,  an edgeedge with one N(1)Mn6 octahedra, edges with two equivalent N(4)Mn5Cu octahedra, edges with two equivalent N(2)Mn6 octahedra, and edges with three equivalent N(3)Mn5Cu octahedra. The corner-sharing octahedral tilt angles range from 1-15°. In the third N site, N(3) is bonded to one Mn(1), one Mn(3), one Mn(4), two equivalent Mn(5), and one Cu(1) atom to form distorted NMn5Cu octahedra that share  a cornercorner with one N(4)Mn5Cu octahedra,  a cornercorner with one N(1)Mn6 octahedra, corners with three equivalent N(3)Mn5Cu octahedra, edges with two equivalent N(4)Mn5Cu octahedra, edges with two equivalent N(1)Mn6 octahedra, and edges with three equivalent N(2)Mn6 octahedra. The corner-sharing octahedral tilt angles range from 0-28°. In the fourth N site, N(4) is bonded to one Mn(3), two equivalent Mn(2), two equivalent Mn(4), and one Cu(1) atom to form NMn5Cu octahedra that share  a cornercorner with one N(3)Mn5Cu octahedra,  a cornercorner with one N(2)Mn6 octahedra, corners with three equivalent N(4)Mn5Cu octahedra,  an edgeedge with one N(4)Mn5Cu octahedra, edges with two equivalent N(3)Mn5Cu octahedra, edges with two equivalent N(2)Mn6 octahedra, and edges with four equivalent N(1)Mn6 octahedra. The corner-sharing octahedral tilt angles range from 0-15°.
Mn10CuN8 crystallizes in the monoclinic C2/m space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a distorted T-shaped geometry to one N(1), one N(2), and one N(3) atom. The Mn(1)-N(1) bond length is 1.90 Å. The Mn(1)-N(2) bond length is 1.90 Å. The Mn(1)-N(3) bond length is 1.89 Å. In the second Mn site, Mn(2) is bonded to one N(2), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of edge and corner-sharing MnN5 square pyramids. The Mn(2)-N(2) bond length is 2.08 Å. There is one shorter (2.02 Å) and one longer (2.22 Å) Mn(2)-N(1) bond length. Both Mn(2)-N(4) bond lengths are 2.03 Å. In the third Mn site, Mn(3) is bonded to one N(3), one N(4), and three equivalent N(2) atoms to form a mixture of edge and corner-sharing MnN5 square pyramids. The Mn(3)-N(3) bond length is 2.05 Å. The Mn(3)-N(4) bond length is 1.98 Å. There are two shorter (2.03 Å) and one longer (2.12 Å) Mn(3)-N(2) bond length. In the fourth Mn site, Mn(4) is bonded to one N(3), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of edge and corner-sharing MnN5 square pyramids. The Mn(4)-N(3) bond length is 1.99 Å. Both Mn(4)-N(1) bond lengths are 2.03 Å. There is one shorter (2.09 Å) and one longer (2.12 Å) Mn(4)-N(4) bond length. In the fifth Mn site, Mn(5) is bonded in a rectangular see-saw-like geometry to one N(1), one N(2), and two equivalent N(3) atoms. The Mn(5)-N(1) bond length is 1.98 Å. The Mn(5)-N(2) bond length is 2.00 Å. Both Mn(5)-N(3) bond lengths are 2.03 Å. Cu(1) is bonded in a distorted square co-planar geometry to two equivalent N(3) and two equivalent N(4) atoms. Both Cu(1)-N(3) bond lengths are 2.38 Å. Both Cu(1)-N(4) bond lengths are 2.08 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded to one Mn(1), one Mn(5), two equivalent Mn(2), and two equivalent Mn(4) atoms to form NMn6 octahedra that share  a cornercorner with one N(3)Mn5Cu octahedra, corners with two equivalent N(1)Mn6 octahedra, corners with two equivalent N(2)Mn6 octahedra,  an edgeedge with one N(1)Mn6 octahedra,  an edgeedge with one N(2)Mn6 octahedra, edges with two equivalent N(3)Mn5Cu octahedra, and edges with four equivalent N(4)Mn5Cu octahedra. The corner-sharing octahedral tilt angles range from 2-28°. In the second N site, N(2) is bonded to one Mn(1), one Mn(2), one Mn(5), and three equivalent Mn(3) atoms to form NMn6 octahedra that share  a cornercorner with one N(4)Mn5Cu octahedra, corners with two equivalent N(1)Mn6 octahedra, corners with two equivalent N(2)Mn6 octahedra,  an edgeedge with one N(1)Mn6 octahedra, edges with two equivalent N(4)Mn5Cu octahedra, edges with two equivalent N(2)Mn6 octahedra, and edges with three equivalent N(3)Mn5Cu octahedra. The corner-sharing octahedral tilt angles range from 1-15°. In the third N site, N(3) is bonded to one Mn(1), one Mn(3), one Mn(4), two equivalent Mn(5), and one Cu(1) atom to form distorted NMn5Cu octahedra that share  a cornercorner with one N(4)Mn5Cu octahedra,  a cornercorner with one N(1)Mn6 octahedra, corners with three equivalent N(3)Mn5Cu octahedra, edges with two equivalent N(4)Mn5Cu octahedra, edges with two equivalent N(1)Mn6 octahedra, and edges with three equivalent N(2)Mn6 octahedra. The corner-sharing octahedral tilt angles range from 0-28°. In the fourth N site, N(4) is bonded to one Mn(3), two equivalent Mn(2), two equivalent Mn(4), and one Cu(1) atom to form NMn5Cu octahedra that share  a cornercorner with one N(3)Mn5Cu octahedra,  a cornercorner with one N(2)Mn6 octahedra, corners with three equivalent N(4)Mn5Cu octahedra,  an edgeedge with one N(4)Mn5Cu octahedra, edges with two equivalent N(3)Mn5Cu octahedra, edges with two equivalent N(2)Mn6 octahedra, and edges with four equivalent N(1)Mn6 octahedra. The corner-sharing octahedral tilt angles range from 0-15°.