Cd2SiH16(C7O2)4 crystallizes in the tetragonal I4/m space group. Cd(1) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Cd(1)-O(1) bond lengths are 2.29 Å. There are two shorter (2.31 Å) and two longer (2.56 Å) Cd(1)-O(2) bond lengths. Si(1) is bonded in a tetrahedral geometry to four equivalent C(1) atoms. All Si(1)-C(1) bond lengths are 1.87 Å. There are seven inequivalent C sites. In the first 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 1.39 Å. The C(1)-C(6) bond length is 1.41 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one H(1) atom. The C(2)-H(1) bond length is 0.93 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-H(2) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one H(3) atom. The C(4)-C(5) bond length is 1.37 Å. The C(4)-H(3) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-C(7) bond length is 1.52 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(4) atom. The C(6)-H(4) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(7)-O(1) bond length is 1.26 Å. The C(7)-O(2) bond length is 1.26 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) 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(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Cd(1) and one C(7) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Cd(1) and one C(7) atom. Linkers: 4 [O]C(=O)c1cccc([Si](c2cccc(C([O])=O)c2)(c2cccc(C([O])=O)c2)c2cccc(C([O])=O)c2)c1. Metal clusters: 2 [C]1O[Cd]23O[C]O[Cd]4(O1)O[C]O[Cd]1(O[C]O4)O[C]O[Cd](O[C]O2)(O[C]O3)O[C]O1. RCSR code: flu. The MOF has largest included sphere 9.42 A, density 1.15 g/cm3, surface area 3718.13 m2/g, accessible volume 0.46 cm3/g