MgCoP2O7 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted pentagonal planar geometry to one O(3), one O(4), one O(5), one O(6), and one O(7) atom. Co(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form distorted CoO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Co(1)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Co(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Co(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mg(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mg(1), one Co(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one Co(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one Co(1), and one P(1) atom.
MgCoP2O7 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a distorted pentagonal planar geometry to one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Mg(1)-O(3) bond length is 2.04 Å. The Mg(1)-O(4) bond length is 1.96 Å. The Mg(1)-O(5) bond length is 2.14 Å. The Mg(1)-O(6) bond length is 2.09 Å. The Mg(1)-O(7) bond length is 1.97 Å. Co(1) is bonded to one O(2), one O(3), one O(5), one O(6), and one O(7) atom to form distorted CoO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Co(1)-O(2) bond length is 1.96 Å. The Co(1)-O(3) bond length is 2.07 Å. The Co(1)-O(5) bond length is 2.29 Å. The Co(1)-O(6) bond length is 2.03 Å. The Co(1)-O(7) bond length is 2.16 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(4), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with two equivalent Co(1)O5 trigonal bipyramids. The P(1)-O(1) bond length is 1.66 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.51 Å. The P(1)-O(7) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with three equivalent Co(1)O5 trigonal bipyramids. The P(2)-O(1) bond length is 1.62 Å. The P(2)-O(3) bond length is 1.55 Å. The P(2)-O(5) bond length is 1.52 Å. The P(2)-O(6) bond length is 1.55 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1), one Co(1), and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Mg(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Mg(1), one Co(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one Co(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one Co(1), and one P(1) atom.