Zn3P4(HO3)4 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(12), one O(2), one O(3), and one O(4) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(2)HO3 tetrahedra,  a cornercorner with one P(4)HO3 tetrahedra, and corners with two equivalent P(1)HO3 tetrahedra. The Zn(1)-O(12) bond length is 1.93 Å. The Zn(1)-O(2) bond length is 1.93 Å. The Zn(1)-O(3) bond length is 2.00 Å. The Zn(1)-O(4) bond length is 1.92 Å. In the second Zn site, Zn(2) is bonded to one O(11), one O(5), one O(6), and one O(7) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(3)HO3 tetrahedra,  a cornercorner with one P(4)HO3 tetrahedra, and corners with two equivalent P(2)HO3 tetrahedra. The Zn(2)-O(11) bond length is 1.95 Å. The Zn(2)-O(5) bond length is 1.94 Å. The Zn(2)-O(6) bond length is 1.96 Å. The Zn(2)-O(7) bond length is 1.93 Å. In the third Zn site, Zn(3) is bonded to one O(1), one O(10), one O(8), and one O(9) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(1)HO3 tetrahedra,  a cornercorner with one P(4)HO3 tetrahedra, and corners with two equivalent P(3)HO3 tetrahedra. The Zn(3)-O(1) bond length is 1.93 Å. The Zn(3)-O(10) bond length is 1.95 Å. The Zn(3)-O(8) bond length is 1.95 Å. The Zn(3)-O(9) bond length is 1.95 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form PHO3 tetrahedra that share  a cornercorner with one Zn(3)O4 tetrahedra and corners with two equivalent Zn(1)O4 tetrahedra. The P(1)-H(1) bond length is 1.29 Å. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.52 Å. In the second P site, P(2) is bonded to one H(2), one O(4), one O(5), and one O(6) atom to form PHO3 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra and corners with two equivalent Zn(2)O4 tetrahedra. The P(2)-H(2) bond length is 1.27 Å. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.52 Å. The P(2)-O(6) bond length is 1.52 Å. In the third P site, P(3) is bonded to one H(3), one O(7), one O(8), and one O(9) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra and corners with two equivalent Zn(3)O4 tetrahedra. The P(3)-H(3) bond length is 1.43 Å. The P(3)-O(7) bond length is 1.52 Å. The P(3)-O(8) bond length is 1.52 Å. The P(3)-O(9) bond length is 1.52 Å. In the fourth P site, P(4) is bonded to one H(4), one O(10), one O(11), and one O(12) atom to form PHO3 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra,  a cornercorner with one Zn(2)O4 tetrahedra, and  a cornercorner with one Zn(3)O4 tetrahedra. The P(4)-H(4) bond length is 1.26 Å. The P(4)-O(10) bond length is 1.51 Å. The P(4)-O(11) bond length is 1.51 Å. The P(4)-O(12) bond length is 1.51 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one P(4) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(3) and one P(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a 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 Zn(2) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Zn(3) and one P(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(3) and one P(3) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Zn(3) and one P(4) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(4) atom. Linkers: 16 [O][PH]([O])=O. Metal clusters: 12 [Zn]. The MOF has largest included sphere 4.81 A, density 1.67 g/cm3, surface area 3208.37 m2/g, accessible volume 0.34 cm3/g