GdC6H3O7 crystallizes in the triclinic P-1 space group. Gd(1) is bonded in a 8-coordinate geometry to one H(2), one O(1), one O(3), one O(4), one O(5), one O(7), and two equivalent O(2) atoms. The Gd(1)-H(2) bond length is 1.99 Å. The Gd(1)-O(1) bond length is 2.42 Å. The Gd(1)-O(3) bond length is 2.47 Å. The Gd(1)-O(4) bond length is 2.46 Å. The Gd(1)-O(5) bond length is 2.46 Å. The Gd(1)-O(7) bond length is 2.42 Å. There is one shorter (2.38 Å) and one longer (2.67 Å) Gd(1)-O(2) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2), one O(3), and one O(5) atom. The C(1)-C(2) bond length is 1.49 Å. The C(1)-O(3) bond length is 1.26 Å. The C(1)-O(5) bond length is 1.28 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.42 Å. The C(2)-C(6) bond length is 1.38 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(6) atom. The C(3)-C(4) bond length is 1.52 Å. The C(3)-C(6) bond length is 1.38 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(2), and one O(4) atom. The C(4)-O(2) bond length is 1.26 Å. The C(4)-O(4) bond length is 1.24 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(7) atom. The C(5)-O(1) bond length is 1.29 Å. The C(5)-O(7) bond length is 1.25 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one H(3) atom. The C(6)-H(3) bond length is 0.93 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. The H(1)-O(6) bond length is 0.85 Å. In the second H site, H(2) is bonded in a single-bond geometry to one Gd(1) and one O(6) atom. The H(2)-O(6) bond length is 0.85 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Gd(1) and one C(5) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Gd(1) and one C(4) atom. In the third O site, O(3) is bonded in a single-bond geometry to one Gd(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Gd(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted L-shaped geometry to one Gd(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one H(1) and one H(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Gd(1) and one C(5) atom. Linkers: 1 [O]C(=O)C([O])=O ,1 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 2 [Gd]. RCSR code: fsh. The MOF has largest included sphere 5.30 A, density 2.09 g/cm3, surface area 2421.62 m2/g, accessible volume 0.19 cm3/g