CoC11H9(NO)2 crystallizes in the monoclinic C2/c space group. Co(1) is bonded in a square co-planar geometry to two equivalent N(1) and two equivalent O(1) atoms. Both Co(1)-N(1) bond lengths are 2.18 Å. Both Co(1)-O(1) bond lengths are 2.10 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(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.28 Å. The C(1)-N(1) bond length is 1.37 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.43 Å. The C(2)-H(2) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(4) atom. The C(3)-C(3) bond length is 1.51 Å. The C(3)-C(4) bond length is 1.44 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(3) atom. The C(4)-C(5) bond length is 1.29 Å. The C(4)-H(3) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one N(1), and one H(4) atom. The C(5)-N(1) bond length is 1.36 Å. The C(5)-H(4) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one H(5) and two equivalent O(1) atoms. The C(6)-H(5) bond length is 0.93 Å. Both C(6)-O(1) bond lengths are 1.21 Å. N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(5) atom. There are five 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(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) 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(6) atom. O(1) is bonded in a bent 120 degrees geometry to one Co(1) and one C(6) atom. Linkers: 4 c1cc(-c2ccncc2)ccn1. Metal clusters: 4 [Co]. The MOF has largest included sphere 4.75 A, density 1.03 g/cm3, surface area 4720.30 m2/g, accessible volume 0.50 cm3/g