RuP3O9 crystallizes in the monoclinic P2_1/c space group. Ru(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(8), and one O(9) atom to form RuO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Ru(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-53°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Ru(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-47°. In the third P site, P(3) is bonded to one O(5), one O(6), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ru(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-44°. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to one Ru(1) and one P(3) atom. In the fifth O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(1) and one P(1) atom. In the sixth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Ru(1) and one P(3) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(1) atom. In the eighth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ru(1) and one P(2) atom. In the ninth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(2) atom.
RuP3O9 crystallizes in the monoclinic P2_1/c space group. Ru(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(8), and one O(9) atom to form RuO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Ru(1)-O(1) bond length is 2.01 Å. The Ru(1)-O(2) bond length is 2.07 Å. The Ru(1)-O(3) bond length is 2.02 Å. The Ru(1)-O(4) bond length is 2.01 Å. The Ru(1)-O(8) bond length is 2.04 Å. The Ru(1)-O(9) bond length is 2.03 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Ru(1)O6 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-53°. The P(1)-O(1) bond length is 1.50 Å. The P(1)-O(2) bond length is 1.49 Å. The P(1)-O(6) bond length is 1.58 Å. The P(1)-O(7) bond length is 1.59 Å. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Ru(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 44-47°. The P(2)-O(3) bond length is 1.48 Å. The P(2)-O(4) bond length is 1.49 Å. The P(2)-O(5) bond length is 1.58 Å. The P(2)-O(7) bond length is 1.59 Å. In the third P site, P(3) is bonded to one O(5), one O(6), one O(8), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Ru(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and  a cornercorner with one P(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 36-44°. The P(3)-O(5) bond length is 1.59 Å. The P(3)-O(6) bond length is 1.59 Å. The P(3)-O(8) bond length is 1.47 Å. The P(3)-O(9) bond length is 1.49 Å. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a distorted bent 120 degrees geometry to one P(2) and one P(3) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one P(1) and one P(3) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one P(1) and one P(2) atom. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to one Ru(1) and one P(3) atom. In the fifth O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(1) and one P(1) atom. In the sixth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Ru(1) and one P(3) atom. In the seventh O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(1) atom. In the eighth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ru(1) and one P(2) atom. In the ninth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(2) atom.