GdC9N4H9O7 crystallizes in the triclinic P1 space group. There are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 9-coordinate geometry to one N(6), one N(8), one O(1), one O(11), one O(13), one O(3), one O(6), one O(7), and one O(9) atom. The Gd(1)-N(6) bond length is 2.64 Å. The Gd(1)-N(8) bond length is 2.53 Å. The Gd(1)-O(1) bond length is 2.37 Å. The Gd(1)-O(11) bond length is 2.42 Å. The Gd(1)-O(13) bond length is 2.51 Å. The Gd(1)-O(3) bond length is 2.49 Å. The Gd(1)-O(6) bond length is 2.28 Å. The Gd(1)-O(7) bond length is 2.41 Å. The Gd(1)-O(9) bond length is 2.43 Å. In the second Gd site, Gd(2) is bonded in a 9-coordinate geometry to one N(5), one N(7), one O(10), one O(12), one O(14), one O(2), one O(4), one O(5), and one O(8) atom. The Gd(2)-N(5) bond length is 2.57 Å. The Gd(2)-N(7) bond length is 2.54 Å. The Gd(2)-O(10) bond length is 2.59 Å. The Gd(2)-O(12) bond length is 2.43 Å. The Gd(2)-O(14) bond length is 2.51 Å. The Gd(2)-O(2) bond length is 2.32 Å. The Gd(2)-O(4) bond length is 2.34 Å. The Gd(2)-O(5) bond length is 2.27 Å. The Gd(2)-O(8) bond length is 2.55 Å. There are eighteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(5) atom. The C(1)-C(5) bond length is 1.51 Å. The C(1)-O(1) bond length is 1.27 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(6), one O(2), and one O(6) atom. The C(2)-C(6) bond length is 1.51 Å. The C(2)-O(2) bond length is 1.27 Å. The C(2)-O(6) bond length is 1.26 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(5), one C(7), and one H(17) atom. The C(3)-C(5) bond length is 1.40 Å. The C(3)-C(7) bond length is 1.40 Å. The C(3)-H(17) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(6), one C(8), and one H(18) atom. The C(4)-C(6) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.40 Å. The C(4)-H(18) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(11), and one C(3) atom. The C(5)-C(11) bond length is 1.41 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(12), one C(2), and one C(4) atom. The C(6)-C(12) bond length is 1.40 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(17), one C(3), and one C(9) atom. The C(7)-C(17) bond length is 1.46 Å. The C(7)-C(9) bond length is 1.40 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(10), one C(18), and one C(4) atom. The C(8)-C(10) bond length is 1.40 Å. The C(8)-C(18) bond length is 1.46 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(13), one C(7), and one H(9) atom. The C(9)-C(13) bond length is 1.40 Å. The C(9)-H(9) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(14), one C(8), and one H(10) atom. The C(10)-C(14) bond length is 1.40 Å. The C(10)-H(10) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(13), one C(5), and one H(11) atom. The C(11)-C(13) bond length is 1.40 Å. The C(11)-H(11) bond length is 1.09 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(14), one C(6), and one H(12) atom. The C(12)-C(14) bond length is 1.40 Å. The C(12)-H(12) bond length is 1.09 Å. In the thirteenth C site, C(13) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(9) atom. The C(13)-C(15) bond length is 1.50 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(16) atom. The C(14)-C(16) bond length is 1.49 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(13), one O(11), and one O(9) atom. The C(15)-O(11) bond length is 1.28 Å. The C(15)-O(9) bond length is 1.28 Å. In the sixteenth C site, C(16) is bonded in a bent 120 degrees geometry to one C(14), one O(10), and one O(12) atom. The C(16)-O(10) bond length is 1.29 Å. The C(16)-O(12) bond length is 1.27 Å. In the seventeenth C site, C(17) is bonded in a distorted water-like geometry to one C(7), one N(1), and one N(7) atom. The C(17)-N(1) bond length is 1.35 Å. The C(17)-N(7) bond length is 1.35 Å. In the eighteenth C site, C(18) is bonded in a distorted water-like geometry to one C(8), one N(2), and one N(8) atom. The C(18)-N(2) bond length is 1.35 Å. The C(18)-N(8) bond length is 1.35 Å. There are eight inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one C(17) and one N(3) atom. The N(1)-N(3) bond length is 1.34 Å. In the second N site, N(2) is bonded in a distorted single-bond geometry to one C(18) and one N(4) atom. The N(2)-N(4) bond length is 1.34 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one N(1), one N(5), and one H(4) atom. The N(3)-N(5) bond length is 1.31 Å. The N(3)-H(4) bond length is 1.63 Å. In the fourth N site, N(4) is bonded in a distorted trigonal planar geometry to one N(2), one N(6), and one H(3) atom. The N(4)-N(6) bond length is 1.31 Å. The N(4)-H(3) bond length is 1.59 Å. In the fifth N site, N(5) is bonded in a 3-coordinate geometry to one Gd(2), one N(3), and one N(7) atom. The N(5)-N(7) bond length is 1.34 Å. In the sixth N site, N(6) is bonded in a 3-coordinate geometry to one Gd(1), one N(4), and one N(8) atom. The N(6)-N(8) bond length is 1.34 Å. In the seventh N site, N(7) is bonded in a 3-coordinate geometry to one Gd(2), one C(17), and one N(5) atom. In the eighth N site, N(8) is bonded in a 3-coordinate geometry to one Gd(1), one C(18), and one N(6) atom. There are eighteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 0.99 Å. In the third H site, H(3) is bonded in a distorted linear geometry to one N(4) and one O(3) atom. The H(3)-O(3) bond length is 1.03 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one N(3) and one O(4) atom. The H(4)-O(4) bond length is 1.01 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(7) atom. The H(5)-O(7) bond length is 0.99 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(8) atom. The H(6)-O(8) bond length is 1.00 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(7) atom. The H(7)-O(7) bond length is 0.98 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(8) atom. The H(8)-O(8) bond length is 0.98 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(9) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(10) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(11) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(12) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one O(13) atom. The H(13)-O(13) bond length is 0.97 Å. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one O(14) atom. The H(14)-O(14) bond length is 0.97 Å. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one O(13) atom. The H(15)-O(13) bond length is 1.00 Å. In the sixteenth H site, H(16) is bonded in a single-bond geometry to one O(14) atom. The H(16)-O(14) bond length is 1.00 Å. In the seventeenth H site, H(17) is bonded in a single-bond geometry to one C(3) atom. In the eighteenth H site, H(18) is bonded in a single-bond geometry to one C(4) atom. There are fourteen 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 2-coordinate geometry to one Gd(2) and one C(2) atom. In the third O site, O(3) is bonded in a water-like geometry to one Gd(1), one H(1), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Gd(2), one H(2), and one H(4) atom. In the fifth O site, O(5) is bonded in a linear geometry to one Gd(2) and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Gd(1) and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Gd(1), one H(5), and one H(7) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Gd(2), one H(6), and one H(8) atom. In the ninth O site, O(9) is bonded in a distorted L-shaped geometry to one Gd(1) and one C(15) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Gd(2) and one C(16) atom. In the eleventh O site, O(11) is bonded in a distorted L-shaped geometry to one Gd(1) and one C(15) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Gd(2) and one C(16) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one Gd(1), one H(13), and one H(15) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one Gd(2), one H(14), and one H(16) atom. Linkers: 2 [O]C(=O)c1cc(C([O])=O)cc(C2=NN=N[N]2)c1. Metal clusters: 1 O.O.O.O.O.O.[O][C]O[Gd]1O[C]O[Gd]2(O[C]O1)O[C]O2. The MOF has largest included sphere 2.71 A, density 2.27 g/cm3, surface area 2842.01 m2/g, accessible volume 0.07 cm3/g