Mn2C3PHO10 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(2), one O(5), one O(7), and one O(9) atom to form distorted MnO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and  an edgeedge with one Mn(2)O5 square pyramid. The Mn(1)-O(1) bond length is 2.17 Å. The Mn(1)-O(10) bond length is 2.27 Å. The Mn(1)-O(2) bond length is 2.05 Å. The Mn(1)-O(5) bond length is 2.22 Å. The Mn(1)-O(7) bond length is 2.21 Å. The Mn(1)-O(9) bond length is 2.23 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(6), one O(8), and one O(9) atom to form distorted MnO5 square pyramids that share corners with two equivalent P(1)O4 tetrahedra and  an edgeedge with one Mn(1)O6 octahedra. The Mn(2)-O(1) bond length is 2.14 Å. The Mn(2)-O(3) bond length is 2.05 Å. The Mn(2)-O(6) bond length is 2.20 Å. The Mn(2)-O(8) bond length is 2.27 Å. The Mn(2)-O(9) bond length is 2.23 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(1)-O(5) bond length is 1.24 Å. The C(1)-O(6) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(2)-O(7) bond length is 1.25 Å. The C(2)-O(8) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(3)-O(10) bond length is 1.23 Å. The C(3)-O(9) bond length is 1.27 Å. 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 corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Mn(2)O5 square pyramids. The corner-sharing octahedral tilt angles range from 33-49°. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.50 Å. The P(1)-O(4) bond length is 1.58 Å. 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. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Mn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(2) and one C(1) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Mn(2) and one C(2) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one C(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(3) atom. Linkers: 3 [O]C(=O)C([O])=O. Metal clusters: 4 [Mn]. The MOF has largest included sphere 4.04 A, density 1.93 g/cm3, surface area 2678.17 m2/g, accessible volume 0.20 cm3/g