GdC4H5O9(CH2)2 crystallizes in the monoclinic P2_1/c space group. The structure consists of eight 02329_fluka molecules inside a GdC4H5O9 framework. In the GdC4H5O9 framework, Gd(1) is bonded in a 9-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(2) atoms. The Gd(1)-O(1) bond length is 2.53 Å. The Gd(1)-O(3) bond length is 2.38 Å. The Gd(1)-O(4) bond length is 2.41 Å. The Gd(1)-O(5) bond length is 2.49 Å. The Gd(1)-O(7) bond length is 2.38 Å. The Gd(1)-O(8) bond length is 2.38 Å. The Gd(1)-O(9) bond length is 2.43 Å. There is one shorter (2.45 Å) and one longer (2.64 Å) Gd(1)-O(2) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.30 Å. In the second C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(7) atom. The C(3)-O(3) bond length is 1.28 Å. The C(3)-O(7) bond length is 1.26 Å. In the third C site, C(4) is bonded in a distorted single-bond geometry to one O(4) atom. The C(4)-O(4) bond length is 1.44 Å. In the fourth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(6)-O(5) bond length is 1.27 Å. The C(6)-O(6) bond length is 1.28 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(4) and one O(6) atom. The H(1)-O(4) bond length is 1.03 Å. The H(1)-O(6) bond length is 1.52 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. The H(2)-O(8) bond length is 0.97 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(8) atom. The H(3)-O(8) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one O(6) and one O(9) atom. The H(4)-O(6) bond length is 1.60 Å. The H(4)-O(9) bond length is 1.01 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(3) and one O(9) atom. The H(5)-O(3) bond length is 1.62 Å. The H(5)-O(9) bond length is 1.01 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Gd(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Gd(1) and one C(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Gd(1), one C(3), and one H(5) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to one Gd(1), one C(4), and one H(1) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Gd(1) and one C(6) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one C(6), one H(1), and one H(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Gd(1) and one C(3) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Gd(1), one H(2), and one H(3) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Gd(1), one H(4), and one H(5) atom. Linkers: 4 [O]C(=O)CC(O)(CC([O])=O)C([O])=O. Metal clusters: 4 [Gd]. The MOF has largest included sphere 2.51 A, density 2.64 g/cm3, surface area 2127.96 m2/g, accessible volume 0.08 cm3/g