SrCoAs2O7 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. Co(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form distorted CoO5 trigonal bipyramids that share corners with two equivalent As(2)O4 tetrahedra and corners with three equivalent As(1)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one As(2)O4 tetrahedra and corners with three equivalent Co(1)O5 trigonal bipyramids. In the second As site, As(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with two equivalent Co(1)O5 trigonal bipyramids. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(1), and one As(2) atom. In the second O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(1), and one As(1) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Co(1), and one As(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), and one As(1) 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 As(1) atom. In the sixth O site, O(3) is bonded in a trigonal planar geometry to two equivalent Sr(1) and one As(2) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom.
SrCoAs2O7 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(5), one O(6), two equivalent O(3), and two equivalent O(7) atoms. The Sr(1)-O(1) bond length is 2.77 Å. The Sr(1)-O(2) bond length is 2.79 Å. The Sr(1)-O(5) bond length is 2.65 Å. The Sr(1)-O(6) bond length is 2.64 Å. There is one shorter (2.55 Å) and one longer (2.59 Å) Sr(1)-O(3) bond length. There is one shorter (2.59 Å) and one longer (2.89 Å) Sr(1)-O(7) bond length. Co(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(7) atom to form distorted CoO5 trigonal bipyramids that share corners with two equivalent As(2)O4 tetrahedra and corners with three equivalent As(1)O4 tetrahedra. The Co(1)-O(1) bond length is 2.06 Å. The Co(1)-O(2) bond length is 2.11 Å. The Co(1)-O(5) bond length is 2.01 Å. The Co(1)-O(6) bond length is 2.04 Å. The Co(1)-O(7) bond length is 2.20 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form AsO4 tetrahedra that share  a cornercorner with one As(2)O4 tetrahedra and corners with three equivalent Co(1)O5 trigonal bipyramids. The As(1)-O(1) bond length is 1.71 Å. The As(1)-O(2) bond length is 1.72 Å. The As(1)-O(4) bond length is 1.79 Å. The As(1)-O(6) bond length is 1.72 Å. In the second As site, As(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form AsO4 tetrahedra that share  a cornercorner with one As(1)O4 tetrahedra and corners with two equivalent Co(1)O5 trigonal bipyramids. The As(2)-O(3) bond length is 1.69 Å. The As(2)-O(4) bond length is 1.79 Å. The As(2)-O(5) bond length is 1.71 Å. The As(2)-O(7) bond length is 1.71 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(1), and one As(2) atom. In the second O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one Co(1), and one As(1) atom. In the third O site, O(7) is bonded in a 4-coordinate geometry to two equivalent Sr(1), one Co(1), and one As(2) atom. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to one Sr(1), one Co(1), and one As(1) 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 As(1) atom. In the sixth O site, O(3) is bonded in a trigonal planar geometry to two equivalent Sr(1) and one As(2) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom.