CoH16(C4N)4 crystallizes in the tetragonal P4_2/nnm space group. Co(1) is bonded in a tetrahedral geometry to four equivalent N(1) atoms. All Co(1)-N(1) bond lengths are 2.01 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one H(1) atom. The C(1)-C(1) bond length is 1.39 Å. The C(1)-C(2) bond length is 1.41 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(1) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one H(1) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-H(1) bond length is 1.09 Å. In the third C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one N(1) atom. The C(4)-C(3) bond length is 1.41 Å. The C(4)-C(5) bond length is 1.49 Å. The C(4)-N(1) bond length is 1.36 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(3) and two C(1,1) atoms. The C(2)-C(3) bond length is 1.47 Å. In the fifth C site, C(5) is bonded in a distorted trigonal non-coplanar geometry to one C(4), one H(2), one H(3), and one H(4) atom. The C(5)-H(2) bond length is 1.10 Å. The C(5)-H(3) bond length is 1.09 Å. The C(5)-H(4) bond length is 1.10 Å. In the sixth C site, C(3) is bonded in a trigonal planar geometry to one C(2) and two equivalent C(4) atoms. N(1) is bonded in a distorted trigonal planar geometry to one Co(1), one C(4), and one N(1) atom. The N(1)-N(1) bond length is 1.38 Å. There are four inequivalent H sites. In the first H site, H(1) 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(5) atom. In the third H site, H(2) is bonded in a single-bond geometry to one C(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. Linkers: 3 C[C]1N=NC(C)=C1c1ccc(C2=C(C)[N]N=C2C)cc1 ,1 C[C]1N=NC(C)=C1c1ccc(C2=C(C)N=N[C]2C)cc1. Metal clusters: 4 [Co]. The MOF has largest included sphere 8.37 A, density 0.82 g/cm3, surface area 4453.46 m2/g, accessible volume 0.69 cm3/g