MgMn2(P2O7)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), one O(4), and one O(8) atom. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(12), one O(13), one O(2), one O(4), and one O(6) atom to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Mn(2)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(11), one O(13), one O(14), one O(2), one O(3), and one O(9) atom to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-57°. In the second P site, P(2) is bonded to one O(10), one O(11), one O(3), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-64°. In the third P site, P(3) is bonded to one O(12), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-55°. In the fourth P site, P(4) is bonded to one O(13), one O(14), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 13-60°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one P(3) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(3) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Mn(1) and one P(4) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one P(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(1), one P(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Mn(2) and one P(1) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Mg(1) and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(2) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(4) atom.
MgMn2(P2O7)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(11), one O(4), and one O(8) atom. The Mg(1)-O(1) bond length is 2.40 Å. The Mg(1)-O(10) bond length is 1.99 Å. The Mg(1)-O(11) bond length is 2.02 Å. The Mg(1)-O(4) bond length is 2.02 Å. The Mg(1)-O(8) bond length is 2.20 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(12), one O(13), one O(2), one O(4), and one O(6) atom to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(3)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Mn(2)O6 octahedra. The Mn(1)-O(1) bond length is 2.00 Å. The Mn(1)-O(12) bond length is 1.87 Å. The Mn(1)-O(13) bond length is 2.45 Å. The Mn(1)-O(2) bond length is 2.00 Å. The Mn(1)-O(4) bond length is 2.18 Å. The Mn(1)-O(6) bond length is 1.89 Å. In the second Mn site, Mn(2) is bonded to one O(11), one O(13), one O(14), one O(2), one O(3), and one O(9) atom to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent P(4)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The Mn(2)-O(11) bond length is 2.31 Å. The Mn(2)-O(13) bond length is 1.99 Å. The Mn(2)-O(14) bond length is 1.93 Å. The Mn(2)-O(2) bond length is 2.44 Å. The Mn(2)-O(3) bond length is 1.92 Å. The Mn(2)-O(9) bond length is 1.93 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 10-57°. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(8) bond length is 1.63 Å. The P(1)-O(9) bond length is 1.51 Å. In the second P site, P(2) is bonded to one O(10), one O(11), one O(3), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 33-64°. The P(2)-O(10) bond length is 1.51 Å. The P(2)-O(11) bond length is 1.55 Å. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(7) bond length is 1.64 Å. In the third P site, P(3) is bonded to one O(12), one O(4), one O(5), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 20-55°. The P(3)-O(12) bond length is 1.54 Å. The P(3)-O(4) bond length is 1.56 Å. The P(3)-O(5) bond length is 1.47 Å. The P(3)-O(8) bond length is 1.71 Å. In the fourth P site, P(4) is bonded to one O(13), one O(14), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 13-60°. The P(4)-O(13) bond length is 1.56 Å. The P(4)-O(14) bond length is 1.52 Å. The P(4)-O(6) bond length is 1.52 Å. The P(4)-O(7) bond length is 1.60 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one Mn(1), and one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(1), and one P(3) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one P(3) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Mn(1) and one P(4) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one P(4) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mg(1), one P(1), and one P(3) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Mn(2) and one P(1) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Mg(1) and one P(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mg(1), one Mn(2), and one P(2) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(3) atom. In the thirteenth O site, O(13) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one P(4) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(4) atom.