Cd2C7N is Copper structured and crystallizes in the trigonal R3m space group. The structure is zero-dimensional and consists of three Cd2C7N clusters. There are two inequivalent Cd sites. In the first Cd site, Cd(1) is bonded in a tetrahedral geometry to one C(1) and three equivalent C(2) atoms. The Cd(1)-C(1) bond length is 2.22 Å. All Cd(1)-C(2) bond lengths are 2.20 Å. In the second Cd site, Cd(2) is bonded in a tetrahedral geometry to three equivalent C(3) and one N(1) atom. All Cd(2)-C(3) bond lengths are 2.20 Å. The Cd(2)-N(1) bond length is 2.22 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one Cd(1) and one N(1) atom. The C(1)-N(1) bond length is 1.05 Å. In the second C site, C(2) is bonded in a single-bond geometry to one Cd(1) atom. In the third C site, C(3) is bonded in a single-bond geometry to one Cd(2) atom. N(1) is bonded in a linear geometry to one Cd(2) and one C(1) atom. Linkers: 1 [C]#[C]. Metal clusters: . The MOF has largest included sphere 6.96 A, density 1.06 g/cm3, surface area 3250.64 m2/g, accessible volume 0.72 cm3/g