CdH8(C4N)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in an octahedral geometry to two equivalent C(15), two equivalent N(1), and two equivalent N(4) atoms. Both Cd(1)-C(15) bond lengths are 2.25 Å. Both Cd(1)-N(1) bond lengths are 2.48 Å. Both Cd(1)-N(4) bond lengths are 2.48 Å. In the second Cd site, Cd(2) is bonded in an octahedral geometry to two equivalent C(16), two equivalent N(2), and two equivalent N(3) atoms. Both Cd(2)-C(16) bond lengths are 2.24 Å. Both Cd(2)-N(2) bond lengths are 2.48 Å. Both Cd(2)-N(3) bond lengths are 2.48 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(3,4); one N(1); and one H(1,2) atom. The C(1)-C(3,4) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.34 Å. The C(1)-H(1,2) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3,4); one N(2); and one H(1,2) atom. The C(2)-C(3,4) bond length is 1.39 Å. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(1,2) bond length is 1.09 Å. In the third C site, C(3,4) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(3) atom. The C(3,4)-C(5) bond length is 1.41 Å. The C(3,4)-H(3) bond length is 1.09 Å. In the fourth C site, C(5) is bonded in a trigonal planar geometry to one C(11,12); one C(3,4); and one C(7,8) atom. The C(5)-C(11,12) bond length is 1.41 Å. The C(5)-C(7,8) bond length is 1.41 Å. In the fifth C site, C(6) is bonded in a trigonal planar geometry to one C(11,12); one C(3,4); and one C(7,8) atom. The C(6)-C(11,12) bond length is 1.41 Å. The C(6)-C(3,4) bond length is 1.41 Å. The C(6)-C(7,8) bond length is 1.41 Å. In the sixth C site, C(7,8) is bonded in a distorted single-bond geometry to one C(5) and one H(5,6) atom. The C(7,8)-H(5,6) bond length is 1.09 Å. In the seventh C site, C(9) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(7,8) atom. The C(9)-N(1) bond length is 1.34 Å. The C(9)-H(7,8) bond length is 1.09 Å. In the eighth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(7,8) atom. The C(10)-N(2) bond length is 1.34 Å. The C(10)-H(7,8) bond length is 1.09 Å. In the ninth C site, C(11,12) is bonded in a linear geometry to one C(13,14) and one C(5) atom. The C(11,12)-C(13,14) bond length is 1.23 Å. In the tenth C site, C(13,14) is bonded in a linear geometry to one C(11,12) and one C(13,14) atom. The C(13,14)-C(13,14) bond length is 1.35 Å. In the eleventh C site, C(15) is bonded in a distorted linear geometry to one Cd(1) and one N(3) atom. The C(15)-N(3) bond length is 1.17 Å. In the twelfth C site, C(16) is bonded in a distorted linear geometry to one Cd(2) and one N(4) atom. The C(16)-N(4) bond length is 1.17 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Cd(1), one C(1), and one C(9) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Cd(2), one C(10), and one C(2) atom. In the third N site, N(3) is bonded in a distorted single-bond geometry to one Cd(2) and one C(15) atom. In the fourth N site, N(4) is bonded in a distorted single-bond geometry to one Cd(1) and one C(16) atom. There are five inequivalent H sites. In the first H site, H(1,2) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(3,4) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(3,4) atom. The H(4)-C(3,4) bond length is 1.09 Å. In the fourth H site, H(5,6) is bonded in a single-bond geometry to one C(7,8) atom. In the fifth H site, H(7,8) is bonded in a single-bond geometry to one C(9) atom. Linkers: 2 C(C#Cc1ccncc1)#Cc1c[c]ncc1 ,1 C(C#Cc1ccncc1)#Cc1ccncc1. Metal clusters: 2 [C]=N[Cd]N=[C]. The MOF has largest included sphere 2.00 A, density 1.74 g/cm3, surface area 4574.17 m2/g, accessible volume 0.09 cm3/g