Zn3P4H8(C2O7)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(2), one O(7), and one O(8) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra, and corners with two equivalent P(1)CO3 tetrahedra. The Zn(1)-O(1) bond length is 1.99 Å. The Zn(1)-O(2) bond length is 1.97 Å. The Zn(1)-O(7) bond length is 1.94 Å. The Zn(1)-O(8) bond length is 1.92 Å. In the second Zn site, Zn(2) is bonded to one O(11), one O(3), one O(5), and one O(9) atom to form distorted ZnO4 tetrahedra that share  a cornercorner with one P(1)CO3 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra, and  a cornercorner with one P(4)CO3 tetrahedra. The Zn(2)-O(11) bond length is 1.96 Å. The Zn(2)-O(3) bond length is 2.00 Å. The Zn(2)-O(5) bond length is 1.94 Å. The Zn(2)-O(9) bond length is 1.97 Å. In the third Zn site, Zn(3) is bonded to one O(10), one O(12), one O(13), and one O(6) atom to form ZnO4 tetrahedra that share  a cornercorner with one P(2)CO3 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra, and corners with two equivalent P(4)CO3 tetrahedra. The Zn(3)-O(10) bond length is 1.91 Å. The Zn(3)-O(12) bond length is 1.91 Å. The Zn(3)-O(13) bond length is 1.96 Å. The Zn(3)-O(6) bond length is 1.93 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted tetrahedral geometry to one C(2), one P(1), one P(2), and one O(4) atom. The C(1)-C(2) bond length is 1.55 Å. The C(1)-P(1) bond length is 1.84 Å. The C(1)-P(2) bond length is 1.84 Å. The C(1)-O(4) bond length is 1.43 Å. In the second C site, C(2) is bonded in a trigonal non-coplanar geometry to one C(1); one H(5); and two equivalent H(3,4) atoms. The C(2)-H(5) bond length is 0.96 Å. Both C(2)-H(3,4) bond lengths are 0.96 Å. In the third C site, C(3) is bonded in a 4-coordinate geometry to one C(4), one P(3), one P(4), and one O(14) atom. The C(3)-C(4) bond length is 1.55 Å. The C(3)-P(3) bond length is 1.84 Å. The C(3)-P(4) bond length is 1.85 Å. The C(3)-O(14) bond length is 1.43 Å. In the fourth C site, C(4) is bonded in a trigonal non-coplanar geometry to one C(3); one H(7); and two equivalent H(6,8) atoms. The C(4)-H(7) bond length is 0.96 Å. Both C(4)-H(6,8) bond lengths are 0.96 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form PCO3 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one P(2)CO3 tetrahedra, and corners with two equivalent Zn(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.53 Å. In the second P site, P(2) is bonded to one C(1), one O(5), one O(6), and one O(7) atom to form PCO3 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra,  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one Zn(3)O4 tetrahedra, and  a cornercorner with one P(1)CO3 tetrahedra. The P(2)-O(5) bond length is 1.52 Å. The P(2)-O(6) bond length is 1.50 Å. The P(2)-O(7) bond length is 1.52 Å. In the third P site, P(3) is bonded to one C(3), one O(10), one O(8), and one O(9) atom to form PCO3 tetrahedra that share  a cornercorner with one Zn(1)O4 tetrahedra,  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one Zn(3)O4 tetrahedra, and  a cornercorner with one P(4)CO3 tetrahedra. The P(3)-O(10) bond length is 1.51 Å. The P(3)-O(8) bond length is 1.51 Å. The P(3)-O(9) bond length is 1.53 Å. In the fourth P site, P(4) is bonded to one C(3), one O(11), one O(12), and one O(13) atom to form PCO3 tetrahedra that share  a cornercorner with one Zn(2)O4 tetrahedra,  a cornercorner with one P(3)CO3 tetrahedra, and corners with two equivalent Zn(3)O4 tetrahedra. The P(4)-O(11) bond length is 1.52 Å. The P(4)-O(12) bond length is 1.53 Å. The P(4)-O(13) bond length is 1.53 Å. There are six 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 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(14) atom. The H(2)-O(14) bond length is 0.82 Å. In the third H site, H(3,4) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(5) is bonded in a single-bond geometry to one C(2) atom. In the fifth H site, H(6,8) is bonded in a single-bond geometry to one C(4) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one C(4) atom. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Zn(1) 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(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one C(1) and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Zn(3) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Zn(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Zn(1) and one P(3) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(3) and one P(3) atom. In the eleventh O site, O(11) is bonded in a 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(3) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Zn(3) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one C(3) and one H(2) atom. Linkers: 16 CC(O)(P([O])([O])=O)P([O])([O])=O. Metal clusters: 24 [Zn]. The MOF has largest included sphere 5.00 A, density 1.80 g/cm3, surface area 2927.82 m2/g, accessible volume 0.29 cm3/g