CoC6H4(N2O)2 crystallizes in the orthorhombic P2_12_12_1 space group. Co(1) is bonded to one N(3), two equivalent N(2), one O(1), and one O(2) atom to form corner-sharing CoN3O2 trigonal bipyramids. The Co(1)-N(3) bond length is 2.02 Å. There is one shorter (1.98 Å) and one longer (2.01 Å) Co(1)-N(2) bond length. The Co(1)-O(1) bond length is 2.20 Å. The Co(1)-O(2) bond length is 2.01 Å. There are six inequivalent C sites. In the first C site, C(4) is bonded in a distorted trigonal planar geometry to one C(5), one C(6), and one H(3) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(6) bond length is 1.39 Å. The C(4)-H(3) bond length is 1.09 Å. In the second C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(4) atom. The C(5)-C(1) bond length is 1.50 Å. The C(5)-C(2) bond length is 1.39 Å. In the third C site, C(6) is bonded in a distorted trigonal planar geometry to one C(3), one C(4), and one H(4) atom. The C(6)-C(3) bond length is 1.39 Å. The C(6)-H(4) bond length is 1.09 Å. In the fourth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(2) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.28 Å. In the fifth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(5), one N(3), and one H(1) atom. The C(2)-N(3) bond length is 1.35 Å. The C(2)-H(1) bond length is 1.09 Å. In the sixth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(6), one N(3), and one H(2) atom. The C(3)-N(3) bond length is 1.35 Å. The C(3)-H(2) bond length is 1.09 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a linear geometry to one N(2) and one N(4) atom. The N(1)-N(2) bond length is 1.22 Å. The N(1)-N(4) bond length is 1.16 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to two equivalent Co(1) and one N(1) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Co(1), one C(2), and one C(3) atom. In the fourth N site, N(4) is bonded in a single-bond geometry to one N(1) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(3) 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(6) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Co(1) and one C(1) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Co(1) and one C(1) atom. Linkers: 3 [O]C(=O)c1cccnc1. Metal clusters: 4 [Co]. The MOF has largest included sphere 2.04 A, density 1.98 g/cm3, surface area 3317.26 m2/g, accessible volume 0.11 cm3/g