CoC4H3(NO)2CH2 crystallizes in the orthorhombic Fdd2 space group. The structure consists of sixteen 02329_fluka molecules inside a CoC4H3(NO)2 framework. In the CoC4H3(NO)2 framework, Co(1) is bonded in a distorted tetrahedral geometry to one N(1), one N(2), one O(1), and one O(2) atom. The Co(1)-N(1) bond length is 1.96 Å. The Co(1)-N(2) bond length is 1.96 Å. The Co(1)-O(1) bond length is 1.96 Å. The Co(1)-O(2) bond length is 2.01 Å. There are four 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(2) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.28 Å. In the second C site, C(3) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(3) atom. The C(3)-N(1) bond length is 1.35 Å. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(3) bond length is 1.08 Å. In the third C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(5), one N(2), and one H(4) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-N(2) bond length is 1.38 Å. The C(4)-H(4) bond length is 1.08 Å. In the fourth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(1), and one H(5) atom. The C(5)-N(1) bond length is 1.39 Å. The C(5)-H(5) bond length is 1.08 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(3), and one C(5) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Co(1), one C(3), and one C(4) atom. There are three inequivalent H sites. In the first H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the second H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(4) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Co(1) and one C(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one Co(1) and one C(1) atom. Linkers: 2 [O]C(=O)CCC([O])=O ,3 [CH]1C=NC=N1 ,1 C1=CN=C[N]1. Metal clusters: 4 [Co]. The MOF has largest included sphere 1.86 A, density 1.92 g/cm3, surface area 3509.87 m2/g, accessible volume 0.11 cm3/g