GdH3(C3O2)3 crystallizes in the tetragonal P4_322 space group. Gd(1) is bonded in a distorted pentagonal pyramidal geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Gd(1)-O(1) bond lengths are 2.33 Å. Both Gd(1)-O(2) bond lengths are 2.38 Å. Both Gd(1)-O(3) bond lengths are 2.38 Å. There are six inequivalent C sites. In the first C site, C(4) is bonded in a bent 120 degrees geometry to one C(5) and two equivalent O(1) atoms. The C(4)-C(5) bond length is 1.53 Å. Both C(4)-O(1) bond lengths are 1.27 Å. In the second C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(2) atoms. Both C(5)-C(2) bond lengths are 1.41 Å. In the third C site, C(6) is bonded in a single-bond geometry to two equivalent C(3) and one H(2) atom. Both C(6)-C(3) bond lengths are 1.41 Å. The C(6)-H(2) bond length is 0.93 Å. In the fourth C site, C(1) is bonded in a bent 120 degrees geometry to one C(3), one O(2), and one O(3) atom. The C(1)-C(3) bond length is 1.51 Å. The C(1)-O(2) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.23 Å. In the fifth C site, C(2) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(1) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-H(1) bond length is 0.93 Å. In the sixth C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(6) atom. There are two 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(6) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Gd(1) and one C(4) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Gd(1) and one C(1) atom. In the third O site, O(3) is bonded in a linear geometry to one Gd(1) and one C(1) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1. Metal clusters: 4 [Gd]. The MOF has largest included sphere 7.13 A, density 1.51 g/cm3, surface area 2489.93 m2/g, accessible volume 0.36 cm3/g