GdH2(CO2)4(CH2)2 crystallizes in the triclinic P-1 space group. The structure consists of eight 02329_fluka molecules inside a GdH2(CO2)4 framework. In the GdH2(CO2)4 framework, there are two inequivalent Gd sites. In the first Gd site, Gd(1) is bonded in a 8-coordinate geometry to one O(11), one O(13), one O(15), one O(2), one O(3), one O(6), one O(7), and one O(9) atom. The Gd(1)-O(11) bond length is 2.35 Å. The Gd(1)-O(13) bond length is 2.40 Å. The Gd(1)-O(15) bond length is 2.43 Å. The Gd(1)-O(2) bond length is 2.30 Å. The Gd(1)-O(3) bond length is 2.31 Å. The Gd(1)-O(6) bond length is 2.42 Å. The Gd(1)-O(7) bond length is 2.31 Å. The Gd(1)-O(9) bond length is 2.55 Å. In the second Gd site, Gd(2) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(12), one O(14), one O(16), one O(4), one O(5), and one O(8) atom. The Gd(2)-O(1) bond length is 2.30 Å. The Gd(2)-O(10) bond length is 2.55 Å. The Gd(2)-O(12) bond length is 2.35 Å. The Gd(2)-O(14) bond length is 2.40 Å. The Gd(2)-O(16) bond length is 2.43 Å. The Gd(2)-O(4) bond length is 2.31 Å. The Gd(2)-O(5) bond length is 2.42 Å. The Gd(2)-O(8) bond length is 2.31 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(3) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(3) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(4) atom. The C(2)-O(2) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.27 Å. In the third C site, C(3,4) is bonded in a distorted single-bond geometry to one O(11) atom. The C(3,4)-O(11) bond length is 1.31 Å. In the fourth C site, C(7) is bonded in a distorted bent 150 degrees geometry to one O(5) and one O(9) atom. The C(7)-O(5) bond length is 1.22 Å. The C(7)-O(9) bond length is 1.23 Å. In the fifth C site, C(8) is bonded in a distorted bent 150 degrees geometry to one O(10) and one O(6) atom. The C(8)-O(10) bond length is 1.23 Å. The C(8)-O(6) bond length is 1.22 Å. In the sixth C site, C(11) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(7) atom. The C(11)-O(13) bond length is 1.27 Å. The C(11)-O(7) bond length is 1.27 Å. In the seventh C site, C(12) is bonded in a distorted bent 120 degrees geometry to one O(14) and one O(8) atom. The C(12)-O(14) bond length is 1.27 Å. The C(12)-O(8) bond length is 1.27 Å. There are two inequivalent H sites. In the first H site, H(9,10) is bonded in a single-bond geometry to one O(15) atom. The H(9,10)-O(15) bond length is 0.98 Å. In the second H site, H(11,12) is bonded in a single-bond geometry to one O(15) atom. The H(11,12)-O(15) bond length is 0.98 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Gd(2) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one C(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Gd(2) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one Gd(2) and one C(7) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one Gd(1) and one C(8) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Gd(1) and one C(11) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Gd(2) and one C(12) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Gd(1) and one C(7) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Gd(2) and one C(8) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Gd(1) and one C(3,4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Gd(2) and one C(3,4) atom. The O(12)-C(3,4) bond length is 1.31 Å. In the thirteenth O site, O(13) is bonded in a distorted single-bond geometry to one Gd(1) and one C(11) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Gd(2) and one C(12) atom. In the fifteenth O site, O(15) is bonded in a water-like geometry to one Gd(1); one H(11,12); and one H(9,10) atom. In the sixteenth O site, O(16) is bonded in a water-like geometry to one Gd(2); one H(11,12); and one H(9,10) atom. The O(16)-H(11,12) bond length is 0.98 Å. The O(16)-H(9,10) bond length is 0.98 Å. Linkers: 4 [O][C](CC([O])=O)CC([O])=O. Metal clusters: 4 [Gd]. The MOF has largest included sphere 1.68 A, density 2.88 g/cm3, surface area 2266.19 m2/g, accessible volume 0.07 cm3/g