MnH6(C3O)4 crystallizes in the monoclinic P2_1/c space group. Mn(1) is bonded to one O(2), one O(3), one O(4), and two equivalent O(1) atoms to form distorted corner-sharing MnO5 square pyramids. The Mn(1)-O(2) bond length is 2.28 Å. The Mn(1)-O(3) bond length is 2.12 Å. The Mn(1)-O(4) bond length is 2.08 Å. There is one shorter (2.14 Å) and one longer (2.32 Å) Mn(1)-O(1) bond length. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(5) and one H(1) atom. The C(1)-C(5) bond length is 1.42 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(3), one C(7), and one C(8) atom. The C(2)-C(3) bond length is 1.48 Å. The C(2)-C(7) bond length is 1.42 Å. The C(2)-C(8) bond length is 1.37 Å. In the third C site, C(3) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.28 Å. The C(3)-O(2) bond length is 1.25 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(6) and one H(2) atom. The C(4)-C(6) bond length is 1.41 Å. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(11), and one C(12) atom. The C(5)-C(11) bond length is 1.36 Å. The C(5)-C(12) bond length is 1.51 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(11), one C(4), and one C(6) atom. The C(6)-C(11) bond length is 1.42 Å. The C(6)-C(6) bond length is 1.42 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(2) and one H(3) atom. The C(7)-H(3) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(10), one C(2), and one H(4) atom. The C(8)-C(10) bond length is 1.42 Å. The C(8)-H(4) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a single-bond geometry to one C(10) and one H(5) atom. The C(9)-C(10) bond length is 1.42 Å. The C(9)-H(5) bond length is 0.93 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(10), one C(8), and one C(9) atom. The C(10)-C(10) bond length is 1.41 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(5), one C(6), and one H(6) atom. The C(11)-H(6) bond length is 0.93 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(3), and one O(4) atom. The C(12)-O(3) bond length is 1.25 Å. The C(12)-O(4) bond length is 1.26 Å. There are six 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(4) 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 C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(11) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one C(3) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one Mn(1) and one C(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(1) and one C(12) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Mn(1) and one C(12) atom. Linkers: 4 [O]C(=O)c1ccc2cc(C([O])=O)ccc2c1. Metal clusters: 4 [Mn]. RCSR code: pts. The MOF has largest included sphere 5.99 A, density 1.06 g/cm3, surface area 3991.65 m2/g, accessible volume 0.42 cm3/g