MoMnO5 crystallizes in the triclinic P-1 space group. Mo(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share corners with five equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-57°. Mn(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form MnO6 octahedra that share corners with five equivalent Mo(1)O4 tetrahedra and  an edgeedge with one Mn(1)O6 octahedra. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mo(1) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mn(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mn(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mn(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Mn(1) atom.
MoMnO5 crystallizes in the triclinic P-1 space group. Mo(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form MoO4 tetrahedra that share corners with five equivalent Mn(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 20-57°. The Mo(1)-O(1) bond length is 1.84 Å. The Mo(1)-O(2) bond length is 1.79 Å. The Mo(1)-O(3) bond length is 1.80 Å. The Mo(1)-O(4) bond length is 1.76 Å. Mn(1) is bonded to one O(2), one O(3), one O(4), one O(5), and two equivalent O(1) atoms to form MnO6 octahedra that share corners with five equivalent Mo(1)O4 tetrahedra and  an edgeedge with one Mn(1)O6 octahedra. The Mn(1)-O(2) bond length is 1.99 Å. The Mn(1)-O(3) bond length is 2.05 Å. The Mn(1)-O(4) bond length is 2.12 Å. The Mn(1)-O(5) bond length is 1.75 Å. There is one shorter (2.08 Å) and one longer (2.25 Å) Mn(1)-O(1) bond length. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mo(1) and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mn(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mn(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mo(1) and one Mn(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Mn(1) atom.