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CoI2 is trigonal omega structured and crystallizes in the trigonal P-3m1 space group. The structure is two-dimensional and consists of one CoI2 sheet oriented in the (0, 0, 1) direction. Co2+ is bonded to six equivalent I1- atoms to form edge-sharing CoI6 octahedra. All Co–I bond lengths are 2.74 Å. I1- is bonded in a distorted T-shaped geometry to three equivalent Co2+ atoms.
Co(NO)2CoI4(NO)2(N2)4 crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of sixteen nitrogen molecules, two Co(NO)2 clusters, and four CoI4(NO)2 clusters. In each Co(NO)2 cluster, Co2+ is bonded in a 3-coordinate geometry to one N+0.67+ and two O2- atoms. The Co–N bond length is 1.86 Å. There are one shorter (2.08 Å) and one longer (2.10 Å) Co–O bond lengths. There are two inequivalent N+0.67+ sites. In the first N+0.67+ site, N+0.67+ is bonded in a distorted linear geometry to one Co2+ and one N+0.67+ atom. The N–N bond length is 1.15 Å. In the second N+0.67+ site, N+0.67+ is bonded in a water-like geometry to two O2- atoms. Both N–O bond lengths are 1.28 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in an L-shaped geometry to one Co2+ and one N+0.67+ atom. In the second O2- site, O2- is bonded in an L-shaped geometry to one Co2+ and one N+0.67+ atom. In each CoI4(NO)2 cluster, Co2+ is bonded in a distorted trigonal non-coplanar geometry to one N+0.67+ and two O2- atoms. The Co–N bond length is 1.77 Å. There are one shorter (2.06 Å) and one longer (2.11 Å) Co–O bond lengths. There are two inequivalent N+0.67+ sites. In the first N+0.67+ site, N+0.67+ is bonded in a distorted bent 150 degrees geometry to one Co2+ and one I1- atom. The N–I bond length is 1.94 Å. In the second N+0.67+ site, N+0.67+ is bonded in a water-like geometry to two O2- atoms. There is one shorter (1.27 Å) and one longer (1.29 Å) N–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted L-shaped geometry to one Co2+, one N+0.67+, and one I1- atom. The O–I bond length is 3.66 Å. In the second O2- site, O2- is bonded in an L-shaped geometry to one Co2+ and one N+0.67+ atom. There are four inequivalent I1- sites. In the first I1- site, I1- is bonded in a single-bond geometry to one N+0.67+ and one I1- atom. The I–I bond length is 2.85 Å. In the second I1- site, I1- is bonded in a single-bond geometry to one I1- atom. The I–I bond length is 2.68 Å. In the third I1- site, I1- is bonded in a single-bond geometry to one I1- atom. In the fourth I1- site, I1- is bonded in an L-shaped geometry to one O2- and one I1- atom.