CaMn2(P2O7)2 crystallizes in the triclinic P1 space group. Ca(1) is bonded in a 7-coordinate geometry to one O(12), one O(13), one O(14), one O(2), one O(3), one O(5), 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(14), one O(4), one O(6), and one O(8) atom to form distorted MnO5 square pyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. In the second Mn site, Mn(2) is bonded to one O(11), one O(2), one O(3), one O(5), and one O(7) atom to form distorted MnO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid, corners with two equivalent Mn(1)O5 square pyramids, and  a cornercorner with one P(3)O4 tetrahedra. In the second P site, P(2) is bonded to one O(1), one O(10), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid, corners with two equivalent Mn(2)O5 square pyramids, and  a cornercorner with one P(4)O4 tetrahedra. In the third P site, P(3) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(2)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and  a cornercorner with one P(2)O4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Mn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one P(2) and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Ca(1) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Ca(1) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Ca(1), one Mn(1), and one P(4) atom.
CaMn2(P2O7)2 crystallizes in the triclinic P1 space group. Ca(1) is bonded in a 7-coordinate geometry to one O(12), one O(13), one O(14), one O(2), one O(3), one O(5), and one O(8) atom. The Ca(1)-O(12) bond length is 2.20 Å. The Ca(1)-O(13) bond length is 2.23 Å. The Ca(1)-O(14) bond length is 2.60 Å. The Ca(1)-O(2) bond length is 2.99 Å. The Ca(1)-O(3) bond length is 2.62 Å. The Ca(1)-O(5) bond length is 2.56 Å. The Ca(1)-O(8) bond length is 2.52 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(14), one O(4), one O(6), and one O(8) atom to form distorted MnO5 square pyramids that share  a cornercorner with one P(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The Mn(1)-O(1) bond length is 2.09 Å. The Mn(1)-O(14) bond length is 2.01 Å. The Mn(1)-O(4) bond length is 1.95 Å. The Mn(1)-O(6) bond length is 1.94 Å. The Mn(1)-O(8) bond length is 1.97 Å. In the second Mn site, Mn(2) is bonded to one O(11), one O(2), one O(3), one O(5), and one O(7) atom to form distorted MnO5 square pyramids that share  a cornercorner with one P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Mn(2)-O(11) bond length is 1.96 Å. The Mn(2)-O(2) bond length is 2.14 Å. The Mn(2)-O(3) bond length is 1.96 Å. The Mn(2)-O(5) bond length is 1.96 Å. The Mn(2)-O(7) bond length is 1.94 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(4), one O(6), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(2)O5 square pyramid, corners with two equivalent Mn(1)O5 square pyramids, and  a cornercorner with one P(3)O4 tetrahedra. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.55 Å. The P(1)-O(6) bond length is 1.54 Å. The P(1)-O(9) bond length is 1.59 Å. In the second P site, P(2) is bonded to one O(1), one O(10), one O(3), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid, corners with two equivalent Mn(2)O5 square pyramids, and  a cornercorner with one P(4)O4 tetrahedra. The P(2)-O(1) bond length is 1.50 Å. The P(2)-O(10) bond length is 1.61 Å. The P(2)-O(3) bond length is 1.55 Å. The P(2)-O(5) bond length is 1.55 Å. In the third P site, P(3) is bonded to one O(11), one O(13), one O(7), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Mn(2)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. The P(3)-O(11) bond length is 1.55 Å. The P(3)-O(13) bond length is 1.50 Å. The P(3)-O(7) bond length is 1.55 Å. The P(3)-O(9) bond length is 1.62 Å. In the fourth P site, P(4) is bonded to one O(10), one O(12), one O(14), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids and  a cornercorner with one P(2)O4 tetrahedra. The P(4)-O(10) bond length is 1.60 Å. The P(4)-O(12) bond length is 1.49 Å. The P(4)-O(14) bond length is 1.57 Å. The P(4)-O(8) bond length is 1.55 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(2) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Mn(2), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(2), and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Mn(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Ca(1), one Mn(1), and one P(4) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one P(2) and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Ca(1) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Ca(1) and one P(3) atom. In the fourteenth O site, O(14) is bonded in a 2-coordinate geometry to one Ca(1), one Mn(1), and one P(4) atom.