Cs2SrP2O7 crystallizes in the monoclinic C2/c space group. Cs(1) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. Sr(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SrO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Sr(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 7-40°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1) and two equivalent P(1) atoms. In the second O site, O(2) is bonded in a 1-coordinate geometry to three equivalent Cs(1), one Sr(1), and one P(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Sr(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to three equivalent Cs(1), one Sr(1), and one P(1) atom.
Cs2SrP2O7 crystallizes in the monoclinic C2/c space group. Cs(1) is bonded in a 10-coordinate geometry to one O(1), three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. The Cs(1)-O(1) bond length is 3.28 Å. There are a spread of Cs(1)-O(2) bond distances ranging from 3.12-3.45 Å. There are a spread of Cs(1)-O(3) bond distances ranging from 3.32-3.37 Å. There are a spread of Cs(1)-O(4) bond distances ranging from 3.07-3.58 Å. Sr(1) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SrO6 octahedra that share corners with six equivalent P(1)O4 tetrahedra. Both Sr(1)-O(2) bond lengths are 2.58 Å. Both Sr(1)-O(3) bond lengths are 2.52 Å. Both Sr(1)-O(4) bond lengths are 2.52 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with three equivalent Sr(1)O6 octahedra and  a cornercorner with one P(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 7-40°. The P(1)-O(1) bond length is 1.65 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.54 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1) and two equivalent P(1) atoms. In the second O site, O(2) is bonded in a 1-coordinate geometry to three equivalent Cs(1), one Sr(1), and one P(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to three equivalent Cs(1), one Sr(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to three equivalent Cs(1), one Sr(1), and one P(1) atom.