GdC13H15O8 crystallizes in the tetragonal P4_122 space group. Gd(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Both Gd(1)-O(1) bond lengths are 2.29 Å. Both Gd(1)-O(2) bond lengths are 2.32 Å. Both Gd(1)-O(3) bond lengths are 2.34 Å. Both Gd(1)-O(4) bond lengths are 2.46 Å. There are eight inequivalent C sites. In the first 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 1.49 Å. The C(1)-O(2) bond length is 1.24 Å. The C(1)-O(3) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one H(2) atom. The C(2)-C(3) bond length is 1.38 Å. The C(2)-C(7) bond length is 1.40 Å. The C(2)-H(2) bond length is 0.95 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(8) atom. The C(3)-C(8) bond length is 1.37 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one H(3), one H(4), and one O(4) atom. The C(4)-H(3) bond length is 0.98 Å. The C(4)-H(4) bond length is 0.99 Å. The C(4)-O(4) bond length is 1.46 Å. In the fifth C site, C(5) is bonded in a 3-coordinate geometry to one H(4), one H(5), one H(6), and one H(7) atom. The C(5)-H(4) bond length is 1.13 Å. The C(5)-H(5) bond length is 0.97 Å. The C(5)-H(6) bond length is 0.98 Å. The C(5)-H(7) bond length is 0.98 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(7) and two equivalent O(1) atoms. The C(6)-C(7) bond length is 1.48 Å. Both C(6)-O(1) bond lengths are 1.26 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(2) atoms. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to two equivalent C(3) and one H(8) atom. The C(8)-H(8) 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 O(4) atom. The H(1)-O(4) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a 3-coordinate geometry to one C(4), one C(5), and one H(5) atom. The H(4)-H(5) bond length is 0.65 Å. In the fifth H site, H(5) is bonded in an L-shaped geometry to one C(5) and one H(4) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(5) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(5) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(8) atom. There are four 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(6) 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 distorted linear geometry to one Gd(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Gd(1), one C(4), and one H(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 4.00 A, density 1.99 g/cm3, surface area 2448.41 m2/g, accessible volume 0.22 cm3/g