Mn2SiH20(C14O5)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to two equivalent O(2), two equivalent O(4), and two equivalent O(5) atoms. Both Mn(1)-O(2) bond lengths are 2.12 Å. Both Mn(1)-O(4) bond lengths are 2.31 Å. Both Mn(1)-O(5) bond lengths are 2.23 Å. In the second Mn site, Mn(2) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. Both Mn(2)-O(1) bond lengths are 2.22 Å. Both Mn(2)-O(3) bond lengths are 2.12 Å. Both Mn(2)-O(4) bond lengths are 2.18 Å. Si(1) is bonded in a tetrahedral geometry to two equivalent C(1) and two equivalent C(8) atoms. Both Si(1)-C(1) bond lengths are 1.88 Å. Both Si(1)-C(8) bond lengths are 1.88 Å. There are fourteen inequivalent C sites. In the first C site, C(10) is bonded in a distorted single-bond geometry to one C(11) and one H(8) atom. The C(10)-C(11) bond length is 1.40 Å. The C(10)-H(8) bond length is 1.09 Å. In the second C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(14) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-C(14) bond length is 1.48 Å. In the third C site, C(12) is bonded in a distorted trigonal planar geometry to one C(11), one C(13), and one H(9) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-H(9) bond length is 1.09 Å. In the fourth C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(8), and one H(10) atom. The C(13)-C(8) bond length is 1.41 Å. The C(13)-H(10) bond length is 1.09 Å. In the fifth C site, C(14) is bonded in a bent 120 degrees geometry to one C(11), one O(4), and one O(5) atom. The C(14)-O(4) bond length is 1.30 Å. The C(14)-O(5) bond length is 1.27 Å. In the sixth C site, C(1) is bonded in a trigonal planar geometry to one Si(1), one C(2), and one C(6) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(6) bond length is 1.41 Å. In the seventh C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(3) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(3) bond length is 1.09 Å. In the eighth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(4) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(4) bond length is 1.09 Å. In the ninth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(7) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(7) bond length is 1.49 Å. In the tenth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(5) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(5) bond length is 1.09 Å. In the eleventh C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one H(6) atom. The C(6)-H(6) bond length is 1.09 Å. In the twelfth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(3) atom. The C(7)-O(2) bond length is 1.29 Å. The C(7)-O(3) bond length is 1.27 Å. In the thirteenth C site, C(8) is bonded in a trigonal planar geometry to one Si(1), one C(13), and one C(9) atom. The C(8)-C(9) bond length is 1.41 Å. In the fourteenth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(7) atom. The C(9)-H(7) bond length is 1.09 Å. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(1) and one O(2) atom. The H(1)-O(1) bond length is 1.01 Å. The H(1)-O(2) bond length is 1.64 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 0.97 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(6) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(9) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(10) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(12) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(13) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one H(1), and one H(2) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mn(1), one C(7), and one H(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(2) and one C(7) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one C(14) atom. In the fifth O site, O(5) is bonded in an L-shaped geometry to one Mn(1) and one C(14) atom. Linkers: 2 [O]C(=O)c1ccc([Si](c2ccc(C([O])=O)cc2)(c2ccc(C([O])=O)cc2)c2ccc(C([O])=O)cc2)cc1. Metal clusters: 4 [Mn]. The MOF has largest included sphere 6.56 A, density 1.04 g/cm3, surface area 4155.42 m2/g, accessible volume 0.47 cm3/g