GdC12N4H6O7 crystallizes in the monoclinic C2/c 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 2.35 Å. Both Gd(1)-O(2) bond lengths are 2.28 Å. Both Gd(1)-O(3) bond lengths are 2.48 Å. There are six inequivalent C sites. In the first C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(3) atom. The C(5)-N(1) bond length is 1.33 Å. The C(5)-H(3) bond length is 0.93 Å. In the second C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(2) atom. The C(6)-C(3) bond length is 1.51 Å. The C(6)-O(1) bond length is 1.24 Å. The C(6)-O(2) bond length is 1.23 Å. In the third C site, C(1) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one N(1) atom. The C(1)-C(1) bond length is 1.48 Å. The C(1)-C(2) bond length is 1.38 Å. The C(1)-N(1) bond length is 1.34 Å. In the fourth C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(1) atom. The C(2)-C(3) bond length is 1.37 Å. The C(2)-H(1) bond length is 0.93 Å. In the fifth 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 1.38 Å. In the sixth C site, C(4) is bonded in a distorted single-bond geometry to one C(3) and one H(2) atom. The C(4)-H(2) bond length is 0.93 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to one C(1) and one C(5) atom. In the second N site, N(2) is bonded in a distorted bent 120 degrees geometry to one N(2), one O(3), and one O(4) atom. The N(2)-N(2) bond length is 0.79 Å. The N(2)-O(3) bond length is 0.98 Å. The N(2)-O(4) bond length is 1.30 Å. There are three 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 2-coordinate geometry to two equivalent N(2) atoms. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one C(6) atom. In the third O site, O(2) is bonded in a linear geometry to one Gd(1) and one C(6) atom. In the fourth O site, O(3) is bonded in a distorted single-bond geometry to one Gd(1) and one N(2) atom. Linkers: 2 [O]N([O])N=O ,4 [O]C(=O)c1ccnc(-c2cc(C([O])=O)ccn2)c1. Metal clusters: 4 [Gd]. The MOF has largest included sphere 4.92 A, density 1.34 g/cm3, surface area 3367.45 m2/g, accessible volume 0.44 cm3/g