NaCoC10H6(N3O4)2 crystallizes in the triclinic P-1 space group. Na(1) is bonded in an octahedral geometry to two equivalent N(2), two equivalent O(2), and two equivalent O(3) atoms. Both Na(1)-N(2) bond lengths are 2.63 Å. Both Na(1)-O(2) bond lengths are 2.36 Å. Both Na(1)-O(3) bond lengths are 2.42 Å. Co(1) is bonded in an octahedral geometry to two equivalent N(1), two equivalent N(3), and two equivalent O(1) atoms. Both Co(1)-N(1) bond lengths are 1.89 Å. Both Co(1)-N(3) bond lengths are 1.96 Å. Both Co(1)-O(1) bond lengths are 1.90 Å. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one N(1) atom. The C(1)-C(2) bond length is 1.39 Å. The C(1)-C(5) bond length is 1.50 Å. The C(1)-N(1) bond length is 1.35 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(2), and one H(1) atom. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(2), and one H(2) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-N(2) bond length is 1.34 Å. The C(3)-H(2) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one N(1), and one H(3) atom. The C(4)-N(1) bond length is 1.34 Å. The C(4)-H(3) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(5)-O(1) bond length is 1.30 Å. The C(5)-O(2) bond length is 1.24 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Co(1), one C(1), and one C(4) atom. In the second N site, N(2) is bonded in a distorted bent 120 degrees geometry to one Na(1), one C(2), and one C(3) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Co(1), one O(3), and one O(4) atom. The N(3)-O(3) bond length is 1.25 Å. The N(3)-O(4) bond length is 1.24 Å. There are three 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. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Co(1) and one C(5) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Na(1) and one C(5) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one N(3) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one N(3) atom. Linkers: 2 [O]C(=O)c1cnccn1. Metal clusters: 1 [Na] ,1 [Co]. The MOF has largest included sphere 1.84 A, density 2.03 g/cm3, surface area 2874.90 m2/g, accessible volume 0.08 cm3/g