TiAs2O7 crystallizes in the monoclinic P2_1/c space group. Ti(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form TiO6 octahedra that share corners with three equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with three equivalent Ti(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-45°. In the second As site, As(2) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form AsO4 tetrahedra that share corners with three equivalent Ti(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-50°. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(2) atom. In the second O site, O(7) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Ti(1) and one As(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ti(1) and one As(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(1) atom. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(1) atom.
TiAs2O7 crystallizes in the monoclinic P2_1/c space group. Ti(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form TiO6 octahedra that share corners with three equivalent As(1)O4 tetrahedra and corners with three equivalent As(2)O4 tetrahedra. The Ti(1)-O(2) bond length is 1.98 Å. The Ti(1)-O(3) bond length is 1.97 Å. The Ti(1)-O(4) bond length is 1.93 Å. The Ti(1)-O(5) bond length is 1.92 Å. The Ti(1)-O(6) bond length is 1.97 Å. The Ti(1)-O(7) bond length is 1.93 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to one O(1), one O(3), one O(4), and one O(5) atom to form AsO4 tetrahedra that share corners with three equivalent Ti(1)O6 octahedra and  a cornercorner with one As(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 40-45°. The As(1)-O(1) bond length is 1.75 Å. The As(1)-O(3) bond length is 1.68 Å. The As(1)-O(4) bond length is 1.68 Å. The As(1)-O(5) bond length is 1.67 Å. In the second As site, As(2) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form AsO4 tetrahedra that share corners with three equivalent Ti(1)O6 octahedra and  a cornercorner with one As(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 34-50°. The As(2)-O(1) bond length is 1.75 Å. The As(2)-O(2) bond length is 1.68 Å. The As(2)-O(6) bond length is 1.68 Å. The As(2)-O(7) bond length is 1.67 Å. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(2) atom. In the second O site, O(7) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(2) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one As(1) and one As(2) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Ti(1) and one As(2) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ti(1) and one As(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(1) atom. In the seventh O site, O(5) is bonded in a bent 150 degrees geometry to one Ti(1) and one As(1) atom.