Zn5P2H16(C4O5)4 crystallizes in the triclinic P-1 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(5), and one O(7) atom to form ZnO4 tetrahedra that share  a cornercorner with one Zn(2)O6 octahedra,  a cornercorner with one P(1)CO3 tetrahedra, and  an edgeedge with one Zn(3)O6 octahedra. The corner-sharing octahedral tilt angles are 62°. The Zn(1)-O(1) bond length is 1.98 Å. The Zn(1)-O(2) bond length is 2.03 Å. The Zn(1)-O(5) bond length is 1.96 Å. The Zn(1)-O(7) bond length is 1.95 Å. In the second Zn site, Zn(2) is bonded to one O(1), one O(10), one O(3), one O(4), one O(8), and one O(9) atom to form ZnO6 octahedra that share  a cornercorner with one Zn(1)O4 tetrahedra, corners with two equivalent P(1)CO3 tetrahedra, and  an edgeedge with one Zn(3)O6 octahedra. The Zn(2)-O(1) bond length is 2.10 Å. The Zn(2)-O(10) bond length is 2.10 Å. The Zn(2)-O(3) bond length is 2.33 Å. The Zn(2)-O(4) bond length is 2.13 Å. The Zn(2)-O(8) bond length is 2.16 Å. The Zn(2)-O(9) bond length is 2.01 Å. In the third Zn site, Zn(3) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ZnO6 octahedra that share corners with two equivalent P(1)CO3 tetrahedra, edges with two equivalent Zn(2)O6 octahedra, and edges with two equivalent Zn(1)O4 tetrahedra. Both Zn(3)-O(1) bond lengths are 2.07 Å. Both Zn(3)-O(2) bond lengths are 2.06 Å. Both Zn(3)-O(3) bond lengths are 2.25 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(4) bond length is 1.40 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one P(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-P(1) bond length is 1.81 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one H(2) atom. The C(3)-C(5) bond length is 1.40 Å. The C(3)-H(2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(1), one C(7), and one C(8) atom. The C(4)-C(7) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.49 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(3), one C(6), and one C(7) atom. The C(5)-C(6) bond length is 1.49 Å. The C(5)-C(7) bond length is 1.40 Å. In the sixth C site, C(6) is bonded in a bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(6)-O(5) bond length is 1.29 Å. The C(6)-O(6) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(4), one C(5), and one H(3) atom. The C(7)-H(3) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(7), and one O(8) atom. The C(8)-O(7) bond length is 1.28 Å. The C(8)-O(8) bond length is 1.28 Å. P(1) is bonded to one C(2), one O(10), one O(2), and one O(9) atom to form PCO3 tetrahedra that share  a cornercorner with one Zn(3)O6 octahedra, corners with two equivalent Zn(2)O6 octahedra, and  a cornercorner with one Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-59°. The P(1)-O(10) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.56 Å. The P(1)-O(9) bond length is 1.53 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(1) atom. The H(4)-O(1) bond length is 0.99 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(3) atom. The H(5)-O(3) bond length is 0.98 Å. In the sixth H site, H(6) is bonded in a linear geometry to one O(3) and one O(6) atom. The H(6)-O(3) bond length is 1.02 Å. The H(6)-O(6) bond length is 1.55 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(4) atom. The H(7)-O(4) bond length is 0.98 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(4) and one O(8) atom. The H(8)-O(4) bond length is 1.00 Å. The H(8)-O(8) bond length is 1.74 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Zn(1), one Zn(2), one Zn(3), and one H(4) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one Zn(3), and one P(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Zn(2), one Zn(3), one H(5), and one H(6) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Zn(2), one H(7), and one H(8) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one Zn(1) and one C(6) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one C(6) and one H(6) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(8) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Zn(2), one C(8), and one H(8) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(2) and one P(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one P(1) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)cc(P([O])([O])=O)c1. Metal clusters: 5 [Zn]. The MOF has largest included sphere 2.93 A, density 2.29 g/cm3, surface area 2969.11 m2/g, accessible volume 0.13 cm3/g