Co3(P2O7)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(7) atoms. In the second Co site, Co(2) is bonded to one O(2), one O(5), one O(6), and two equivalent O(4) atoms to form CoO5 trigonal bipyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Co(2)O5 trigonal bipyramid. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent Co(2)O5 trigonal bipyramids. In the second P site, P(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Co(2)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Co(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(2) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Co(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Co(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(1) atom.
Co3(P2O7)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(7) atoms. Both Co(1)-O(1) bond lengths are 1.99 Å. Both Co(1)-O(7) bond lengths are 2.03 Å. In the second Co site, Co(2) is bonded to one O(2), one O(5), one O(6), and two equivalent O(4) atoms to form CoO5 trigonal bipyramids that share corners with two equivalent P(2)O4 tetrahedra, corners with three equivalent P(1)O4 tetrahedra, and  an edgeedge with one Co(2)O5 trigonal bipyramid. The Co(2)-O(2) bond length is 1.89 Å. The Co(2)-O(5) bond length is 1.85 Å. The Co(2)-O(6) bond length is 1.94 Å. There is one shorter (1.98 Å) and one longer (2.18 Å) Co(2)-O(4) bond length. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent Co(2)O5 trigonal bipyramids. The P(1)-O(3) bond length is 1.61 Å. The P(1)-O(4) bond length is 1.57 Å. The P(1)-O(5) bond length is 1.55 Å. The P(1)-O(7) bond length is 1.50 Å. In the second P site, P(2) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra and corners with two equivalent Co(2)O5 trigonal bipyramids. The P(2)-O(1) bond length is 1.50 Å. The P(2)-O(2) bond length is 1.57 Å. The P(2)-O(3) bond length is 1.63 Å. The P(2)-O(6) bond length is 1.52 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Co(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Co(2) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Co(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Co(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one P(1) atom.