SrCo3(P2O7)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, and edges with two equivalent Co(2)O6 octahedra. In the second Co site, Co(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(4) atoms to form CoO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(2), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra, corners with three equivalent Co(2)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-60°. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with three equivalent Co(2)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-59°. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Co(1), one Co(2), and one P(2) atom. In the second O site, O(6) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one P(1) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one Co(2), and one P(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Co(2), and one P(2) atom. In the fifth O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one P(1) atom.
SrCo3(P2O7)2 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a distorted body-centered cubic geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), and two equivalent O(7) atoms. Both Sr(1)-O(1) bond lengths are 2.69 Å. Both Sr(1)-O(2) bond lengths are 2.59 Å. Both Sr(1)-O(5) bond lengths are 2.68 Å. Both Sr(1)-O(7) bond lengths are 2.76 Å. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded to two equivalent O(2), two equivalent O(5), and two equivalent O(6) atoms to form CoO6 octahedra that share corners with two equivalent P(2)O4 tetrahedra, corners with four equivalent P(1)O4 tetrahedra, and edges with two equivalent Co(2)O6 octahedra. Both Co(1)-O(2) bond lengths are 2.12 Å. Both Co(1)-O(5) bond lengths are 2.17 Å. Both Co(1)-O(6) bond lengths are 2.10 Å. In the second Co site, Co(2) is bonded to one O(1), one O(5), one O(6), one O(7), and two equivalent O(4) atoms to form CoO6 octahedra that share corners with three equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra,  an edgeedge with one Co(1)O6 octahedra, and  an edgeedge with one Co(2)O6 octahedra. The Co(2)-O(1) bond length is 2.14 Å. The Co(2)-O(5) bond length is 2.26 Å. The Co(2)-O(6) bond length is 2.11 Å. The Co(2)-O(7) bond length is 2.12 Å. There is one shorter (2.10 Å) and one longer (2.14 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(2), one O(3), one O(4), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Co(1)O6 octahedra, corners with three equivalent Co(2)O6 octahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-60°. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.61 Å. The P(1)-O(4) bond length is 1.54 Å. The P(1)-O(6) bond length is 1.54 Å. In the second P site, P(2) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Co(1)O6 octahedra, corners with three equivalent Co(2)O6 octahedra, and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-59°. The P(2)-O(1) bond length is 1.52 Å. The P(2)-O(3) bond length is 1.62 Å. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(7) bond length is 1.53 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a 4-coordinate geometry to one Sr(1), one Co(1), one Co(2), and one P(2) atom. In the second O site, O(6) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(2), and one P(1) atom. In the third O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one Co(2), and one P(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Co(2), and one P(2) atom. In the fifth O site, O(2) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(1), and one P(1) atom. In the sixth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one P(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Co(2) and one P(1) atom.