Mn4P3H6(C2O7)4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(11), one O(13), one O(9), and two equivalent O(7) atoms to form MnO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra and  an edgeedge with one Mn(1)O6 octahedra. The Mn(1)-O(1) bond length is 2.07 Å. The Mn(1)-O(11) bond length is 2.26 Å. The Mn(1)-O(13) bond length is 2.13 Å. The Mn(1)-O(9) bond length is 2.18 Å. There is one shorter (2.19 Å) and one longer (2.22 Å) Mn(1)-O(7) bond length. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(14), one O(2), one O(5), and one O(8) atom to form MnO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra and  a cornercorner with one P(2)O4 tetrahedra. The Mn(2)-O(10) bond length is 2.20 Å. The Mn(2)-O(12) bond length is 2.20 Å. The Mn(2)-O(14) bond length is 2.26 Å. The Mn(2)-O(2) bond length is 2.09 Å. The Mn(2)-O(5) bond length is 2.08 Å. The Mn(2)-O(8) bond length is 2.23 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(1)-O(7) bond length is 1.26 Å. The C(1)-O(8) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(2)-O(10) bond length is 1.24 Å. The C(2)-O(9) bond length is 1.26 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(12) atom. The C(3)-O(11) bond length is 1.26 Å. The C(3)-O(12) bond length is 1.24 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(14) atom. The C(4)-O(13) bond length is 1.26 Å. The C(4)-O(14) bond length is 1.25 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra and  a cornercorner with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 39-40°. The P(1)-O(1) bond length is 1.49 Å. The P(1)-O(2) bond length is 1.48 Å. The P(1)-O(3) bond length is 1.56 Å. The P(1)-O(4) bond length is 1.57 Å. In the second P site, P(2) is bonded to two equivalent O(5) and two equivalent O(6) atoms to form PO4 tetrahedra that share corners with two equivalent Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles are 37°. Both P(2)-O(5) bond lengths are 1.47 Å. Both P(2)-O(6) bond lengths are 1.56 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 0.82 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(6) atom. The H(3)-O(6) bond length is 0.82 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(1) atom. In the third O site, O(3) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one P(1) and one H(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one P(2) and one H(3) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one C(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Mn(2) and one C(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Mn(2) and one C(2) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(3) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Mn(2) and one C(3) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(4) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Mn(2) and one C(4) atom. Linkers: 16 [O]C(=O)C([O])=O. Metal clusters: 16 [Mn]. The MOF has largest included sphere 4.48 A, density 1.50 g/cm3, surface area 3166.15 m2/g, accessible volume 0.33 cm3/g