V2P4H3O16 crystallizes in the triclinic P1 space group. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(12), one O(14), one O(15), one O(2), one O(3), and one O(5) atom to form VO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. In the second V site, V(2) is bonded to one O(1), one O(11), one O(16), one O(6), one O(8), and one O(9) atom to form VO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(16), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra and corners with two equivalent V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-45°. In the second P site, P(2) is bonded to one O(11), one O(12), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra and corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-42°. In the third P site, P(3) is bonded to one O(10), one O(14), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra and corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-43°. In the fourth P site, P(4) is bonded to one O(1), one O(13), one O(15), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra and corners with two equivalent V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-45°. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(13) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(10) and one O(7) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one V(2) and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one V(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to one V(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one V(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one P(2) and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one V(2) and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one V(2) and one P(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(3) and one H(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one V(2) and one P(2) atom. In the twelfth O site, O(12) is bonded in a linear geometry to one V(1) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one P(4) and one H(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one V(1) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one V(1) and one P(4) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to one V(2) and one P(1) atom.
V2P4H3O16 crystallizes in the triclinic P1 space group. There are two inequivalent V sites. In the first V site, V(1) is bonded to one O(12), one O(14), one O(15), one O(2), one O(3), and one O(5) atom to form VO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The V(1)-O(12) bond length is 1.86 Å. The V(1)-O(14) bond length is 1.94 Å. The V(1)-O(15) bond length is 1.91 Å. The V(1)-O(2) bond length is 1.91 Å. The V(1)-O(3) bond length is 1.87 Å. The V(1)-O(5) bond length is 1.91 Å. In the second V site, V(2) is bonded to one O(1), one O(11), one O(16), one O(6), one O(8), and one O(9) atom to form VO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The V(2)-O(1) bond length is 1.86 Å. The V(2)-O(11) bond length is 1.97 Å. The V(2)-O(16) bond length is 1.86 Å. The V(2)-O(6) bond length is 1.99 Å. The V(2)-O(8) bond length is 2.01 Å. The V(2)-O(9) bond length is 2.01 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(16), one O(2), one O(4), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra and corners with two equivalent V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-45°. The P(1)-O(16) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.59 Å. The P(1)-O(8) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(11), one O(12), one O(3), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra and corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 6-42°. The P(2)-O(11) bond length is 1.55 Å. The P(2)-O(12) bond length is 1.58 Å. The P(2)-O(3) bond length is 1.60 Å. The P(2)-O(7) bond length is 1.49 Å. In the third P site, P(3) is bonded to one O(10), one O(14), one O(5), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one V(2)O6 octahedra and corners with two equivalent V(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-43°. The P(3)-O(10) bond length is 1.55 Å. The P(3)-O(14) bond length is 1.56 Å. The P(3)-O(5) bond length is 1.55 Å. The P(3)-O(6) bond length is 1.54 Å. In the fourth P site, P(4) is bonded to one O(1), one O(13), one O(15), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one V(1)O6 octahedra and corners with two equivalent V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 15-45°. The P(4)-O(1) bond length is 1.53 Å. The P(4)-O(13) bond length is 1.59 Å. The P(4)-O(15) bond length is 1.53 Å. The P(4)-O(9) bond length is 1.52 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(13) atom. The H(2)-O(13) bond length is 0.98 Å. In the third H site, H(3) is bonded in a distorted single-bond geometry to one O(10) and one O(7) atom. The H(3)-O(10) bond length is 1.02 Å. The H(3)-O(7) bond length is 1.67 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one V(2) and one P(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one V(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one V(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to one V(1) and one P(3) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one V(2) and one P(3) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one P(2) and one H(3) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one V(2) and one P(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one V(2) and one P(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one P(3) and one H(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one V(2) and one P(2) atom. In the twelfth O site, O(12) is bonded in a linear geometry to one V(1) and one P(2) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one P(4) and one H(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one V(1) and one P(3) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one V(1) and one P(4) atom. In the sixteenth O site, O(16) is bonded in a linear geometry to one V(2) and one P(1) atom.