GdH5(C3O2)3 crystallizes in the monoclinic P2_1/c space group. Gd(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), two equivalent O(4), and two equivalent O(6) atoms. The Gd(1)-O(1) bond length is 2.35 Å. The Gd(1)-O(2) bond length is 2.27 Å. The Gd(1)-O(3) bond length is 2.34 Å. The Gd(1)-O(5) bond length is 2.31 Å. There is one shorter (2.48 Å) and one longer (2.55 Å) Gd(1)-O(4) bond length. There is one shorter (2.36 Å) and one longer (2.58 Å) Gd(1)-O(6) bond length. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(1), and one O(5) atom. The C(1)-C(6) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(5) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(2), and one O(3) atom. The C(2)-C(3) bond length is 1.50 Å. The C(2)-O(2) bond length is 1.29 Å. The C(2)-O(3) bond length is 1.26 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(8) bond length is 1.40 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(1) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(1) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(2) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(2) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(7) atom. The C(6)-C(7) bond length is 1.40 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(6) and one H(3) atom. The C(7)-H(3) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(3) and one H(4) atom. The C(8)-H(4) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one H(5), one O(4), and one O(6) atom. The C(9)-H(5) bond length is 1.10 Å. The C(9)-O(4) bond length is 1.28 Å. The C(9)-O(6) bond length is 1.27 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) 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. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Gd(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Gd(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Gd(1) and one C(9) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Gd(1) and one C(9) atom. Linkers: 4 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 4 [Gd]. The MOF has largest included sphere 1.87 A, density 2.65 g/cm3, surface area 2350.03 m2/g, accessible volume 0.09 cm3/g