CoC8N5H4O2BrC2HBr crystallizes in the hexagonal P6_3/mmc space group. The structure consists of twelve 2,3-dibromobutane molecules inside a CoC8N5H4O2Br framework. In the CoC8N5H4O2Br framework, Co(1) is bonded in a distorted tetrahedral geometry to one N(1), one N(2), one N(3), and one N(4) atom. The Co(1)-N(1) bond length is 2.01 Å. The Co(1)-N(2) bond length is 1.99 Å. The Co(1)-N(3) bond length is 1.98 Å. The Co(1)-N(4) bond length is 2.07 Å. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one N(1) atom. The C(1)-C(1) bond length is 1.36 Å. The C(1)-C(5) bond length is 1.49 Å. The C(1)-N(1) bond length is 1.44 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one N(3) atom. The C(2)-N(3) bond length is 1.38 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(1) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one N(4) and one H(2) atom. The C(4)-N(4) bond length is 1.32 Å. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(1), one C(8), and one H(3) atom. The C(5)-C(8) bond length is 1.30 Å. The C(5)-H(3) bond length is 0.93 Å. In the sixth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(5), one C(8), and one Br(2) atom. The C(8)-C(8) bond length is 1.10 Å. The C(8)-Br(2) bond length is 2.09 Å. In the seventh C site, C(9) is bonded in a trigonal planar geometry to one N(5) and two equivalent N(2) atoms. The C(9)-N(5) bond length is 1.44 Å. Both C(9)-N(2) bond lengths are 1.31 Å. In the eighth C site, C(10) is bonded in a trigonal planar geometry to two equivalent N(1) and one H(5) atom. Both C(10)-N(1) bond lengths are 1.35 Å. The C(10)-H(5) bond length is 0.93 Å. In the ninth C site, C(11) is bonded in a trigonal planar geometry to one N(6) and two equivalent N(4) atoms. The C(11)-N(6) bond length is 1.45 Å. Both C(11)-N(4) bond lengths are 1.34 Å. In the tenth C site, C(12) is bonded in a trigonal planar geometry to two equivalent N(3) and one H(6) atom. Both C(12)-N(3) bond lengths are 1.37 Å. The C(12)-H(6) bond length is 0.93 Å. There are six inequivalent N sites. In the first N site, N(5) is bonded in a trigonal planar geometry to one C(9) and two equivalent O(1) atoms. Both N(5)-O(1) bond lengths are 1.23 Å. In the second N site, N(6) is bonded in a trigonal planar geometry to one C(11) and two equivalent O(2) atoms. Both N(6)-O(2) bond lengths are 1.15 Å. In the third N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(10) atom. In the fourth N site, N(2) is bonded in a trigonal planar geometry to one Co(1), one C(3), and one C(9) atom. In the fifth N site, N(3) is bonded in a trigonal planar geometry to one Co(1), one C(12), and one C(2) atom. In the sixth N site, N(4) is bonded in a trigonal planar geometry to one Co(1), one C(11), and one C(4) atom. There are five inequivalent H sites. In the first H site, H(6) is bonded in a single-bond geometry to one C(12) atom. In the second H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the third H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(3) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(10) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one N(5) atom. In the second O site, O(2) is bonded in a single-bond geometry to one N(6) atom. Br(2) is bonded in a distorted single-bond geometry to one C(8) and one Br(2) atom. The Br(2)-Br(2) bond length is 2.03 Å. Linkers: 24 Brc1cc2c(cc1Br)N=C[N]2 ,20 O=[N+]([O-])C1=NC=C[N]1 ,4 O=[N+]([O-])C1=N[CH]C=N1. Metal clusters: 24 [Co]. The MOF has largest included sphere 8.40 A, density 1.54 g/cm3, surface area 3043.68 m2/g, accessible volume 0.38 cm3/g