ZnP2H3O8 crystallizes in the monoclinic Pc space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(16), one O(3), and one O(9) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. The Zn(1)-O(1) bond length is 1.93 Å. The Zn(1)-O(16) bond length is 1.92 Å. The Zn(1)-O(3) bond length is 1.94 Å. The Zn(1)-O(9) bond length is 1.96 Å. In the second Zn site, Zn(2) is bonded to one O(14), one O(5), one O(6), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The Zn(2)-O(14) bond length is 1.93 Å. The Zn(2)-O(5) bond length is 1.93 Å. The Zn(2)-O(6) bond length is 1.93 Å. The Zn(2)-O(8) bond length is 1.94 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(12), one O(15), one O(16), and one O(9) atom to form PO4 tetrahedra that share corners with two equivalent Zn(1)O4 tetrahedra. The P(1)-O(12) bond length is 1.56 Å. The P(1)-O(15) bond length is 1.56 Å. The P(1)-O(16) bond length is 1.50 Å. The P(1)-O(9) bond length is 1.49 Å. In the second P site, P(2) is bonded to one O(13), one O(14), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Zn(2)O4 tetrahedra. The P(2)-O(13) bond length is 1.56 Å. The P(2)-O(14) bond length is 1.49 Å. The P(2)-O(6) bond length is 1.50 Å. The P(2)-O(7) bond length is 1.56 Å. In the third P site, P(3) is bonded to one O(11), one O(2), one O(3), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O4 tetrahedra. The P(3)-O(11) bond length is 1.58 Å. The P(3)-O(2) bond length is 1.54 Å. The P(3)-O(3) bond length is 1.51 Å. The P(3)-O(8) bond length is 1.52 Å. In the fourth P site, P(4) is bonded to one O(1), one O(10), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and  a cornercorner with one Zn(2)O4 tetrahedra. The P(4)-O(1) bond length is 1.51 Å. The P(4)-O(10) bond length is 1.54 Å. The P(4)-O(4) bond length is 1.58 Å. The P(4)-O(5) bond length is 1.52 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(4) atom. The H(1)-O(4) bond length is 0.89 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 0.90 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(11) atom. The H(3)-O(11) bond length is 0.90 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(10) and one O(12) atom. The H(4)-O(10) bond length is 1.70 Å. The H(4)-O(12) bond length is 0.90 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(13) and one O(2) atom. The H(5)-O(13) bond length is 0.90 Å. The H(5)-O(2) bond length is 1.73 Å. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one O(15) atom. The H(6)-O(15) bond length is 0.90 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one P(4) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one P(3) and one H(5) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(4) and one H(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(2) and one P(4) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one H(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one P(3) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one P(4) and one H(4) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one P(3) and one H(3) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one P(1) and one H(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one P(2) and one H(5) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Zn(2) and one P(2) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one P(1) and one H(6) atom. In the sixteenth O site, O(16) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(1) atom. Linkers: 4 [O]P([O])(=O)O ,4 [O]P(=O)(O)O. Metal clusters: 4 [Zn]. The MOF has largest included sphere 4.98 A, density 1.44 g/cm3, surface area 3411.61 m2/g, accessible volume 0.37 cm3/g