Cd3H12(C4N11)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one N(1), one N(2), one N(5), one N(7), and one N(9) atom to form corner-sharing CdN5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 70°. The Cd(1)-N(1) bond length is 2.27 Å. The Cd(1)-N(2) bond length is 2.31 Å. The Cd(1)-N(5) bond length is 2.30 Å. The Cd(1)-N(7) bond length is 2.33 Å. The Cd(1)-N(9) bond length is 2.40 Å. In the second Cd site, Cd(2) is bonded to two equivalent N(3), two equivalent N(6), and two equivalent N(9) atoms to form corner-sharing CdN6 octahedra. Both Cd(2)-N(3) bond lengths are 2.30 Å. Both Cd(2)-N(6) bond lengths are 2.37 Å. Both Cd(2)-N(9) bond lengths are 2.44 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(2), one N(3), and one H(5) atom. The C(1)-N(2) bond length is 1.32 Å. The C(1)-N(3) bond length is 1.35 Å. The C(1)-H(5) bond length is 1.09 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(1), one N(3), and one N(4) atom. The C(2)-N(1) bond length is 1.35 Å. The C(2)-N(3) bond length is 1.35 Å. The C(2)-N(4) bond length is 1.37 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one N(5), one N(7), and one H(6) atom. The C(3)-N(5) bond length is 1.33 Å. The C(3)-N(7) bond length is 1.35 Å. The C(3)-H(6) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one N(6), one N(7), and one N(8) atom. The C(4)-N(6) bond length is 1.34 Å. The C(4)-N(7) bond length is 1.37 Å. The C(4)-N(8) bond length is 1.37 Å. There are eleven inequivalent N sites. In the first N site, N(10) is bonded in a linear geometry to one N(11) and one N(9) atom. The N(10)-N(11) bond length is 1.17 Å. The N(10)-N(9) bond length is 1.21 Å. In the second N site, N(11) is bonded in a single-bond geometry to one N(10) atom. In the third N site, N(1) is bonded in a 3-coordinate geometry to one Cd(1), one C(2), and one N(2) atom. The N(1)-N(2) bond length is 1.39 Å. In the fourth N site, N(2) is bonded in a 3-coordinate geometry to one Cd(1), one C(1), and one N(1) atom. In the fifth N site, N(3) is bonded in a distorted trigonal planar geometry to one Cd(2), one C(1), and one C(2) atom. In the sixth N site, N(4) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one H(1), and one H(2) atom. The N(4)-H(1) bond length is 1.03 Å. The N(4)-H(2) bond length is 1.02 Å. In the seventh N site, N(5) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(3), and one N(6) atom. The N(5)-N(6) bond length is 1.38 Å. In the eighth N site, N(6) is bonded in a 3-coordinate geometry to one Cd(2), one C(4), and one N(5) atom. In the ninth N site, N(7) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(3), and one C(4) atom. In the tenth N site, N(8) is bonded in a trigonal non-coplanar geometry to one C(4), one H(3), and one H(4) atom. The N(8)-H(3) bond length is 1.02 Å. The N(8)-H(4) bond length is 1.02 Å. In the eleventh N site, N(9) is bonded in a trigonal non-coplanar geometry to one Cd(1), one Cd(2), and one N(10) atom. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(8) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(1) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(3) atom. Linkers: 4 NC1=NN=C[N]1 ,3 NC1=N[N]C=N1 ,1 NC1=[N]=CN=N1. Metal clusters: 6 [Cd]. The MOF has largest included sphere 2.44 A, density 2.50 g/cm3, surface area 2997.08 m2/g, accessible volume 0.07 cm3/g