YH18(C6O)4 crystallizes in the cubic Fm-3c space group. Y(1) is bonded in a square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Y(1)-O(1) bond lengths are 2.23 Å. Both Y(1)-O(2) bond lengths are 2.06 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.31 Å. The C(1)-O(2) bond length is 1.12 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(12), and one C(3) atom. The C(2)-C(12) bond length is 1.53 Å. The C(2)-C(3) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.57 Å. The C(3)-H(1) bond length is 0.95 Å. In the fourth C site, C(4) is bonded in a trigonal non-coplanar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.61 Å. The C(4)-C(8) bond length is 1.35 Å. In the fifth C site, C(5) is bonded in a distorted trigonal pyramidal geometry to one C(10), one C(11), one C(4), and one C(6) atom. The C(5)-C(10) bond length is 1.38 Å. The C(5)-C(11) bond length is 1.60 Å. The C(5)-C(6) bond length is 1.56 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(7) atoms. There is one shorter (1.33 Å) and one longer (1.43 Å) C(6)-C(7) bond length. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(8) and two equivalent C(6) atoms. The C(7)-C(8) bond length is 1.58 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(4), one C(7), and one C(9) atom. The C(8)-C(9) bond length is 1.65 Å. In the ninth C site, C(9) is bonded in a single-bond geometry to one C(8) and one H(2) atom. The C(9)-H(2) bond length is 0.95 Å. In the tenth C site, C(10) is bonded in a trigonal non-coplanar geometry to one C(5), one H(3), one H(4), and one H(5) atom. The C(10)-H(3) bond length is 0.98 Å. The C(10)-H(4) bond length is 0.98 Å. The C(10)-H(5) bond length is 0.98 Å. In the eleventh C site, C(11) is bonded in a trigonal non-coplanar geometry to one C(5); one H(8); and two equivalent H(6,7) atoms. The C(11)-H(8) bond length is 0.98 Å. Both C(11)-H(6,7) bond lengths are 0.98 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(2) and one H(9) atom. The C(12)-H(9) bond length is 0.95 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(9) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(10) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(10) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(10) atom. In the sixth H site, H(6,7) is bonded in a single-bond geometry to one C(11) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one C(11) atom. In the eighth H site, H(9) is bonded in a single-bond geometry to one C(12) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to one Y(1) and one C(1) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Y(1) and one C(1) atom. Linkers: 64 CC1(C)c2cc(C([O])=O)ccc2-c2c1c1c(c3c2C(C)(C)c2cc(C([O])=O)ccc2-3)C(C)(C)c2cc(C([O])=O)ccc2-1. Metal clusters: 24 [C]1O[Y]23O[C]O[Y]4(O1)O[C]O[Y]1(O[C]O4)O[C]O[Y](O[C]O2)(O[C]O3)O[C]O1. RCSR code: the. The MOF has largest included sphere 21.54 A, density 0.53 g/cm3, surface area 4369.29 m2/g, accessible volume 1.38 cm3/g