CoOOH(CO) crystallizes in the triclinic P1 space group. There are six inequivalent Co sites. In the first Co site, Co(1) is bonded in a 5-coordinate geometry to one O(1), one O(13), one O(15), one O(4), and one O(7) atom. The Co(1)-O(1) bond length is 2.01 Å. The Co(1)-O(13) bond length is 1.79 Å. The Co(1)-O(15) bond length is 1.80 Å. The Co(1)-O(4) bond length is 2.12 Å. The Co(1)-O(7) bond length is 1.99 Å. In the second Co site, Co(2) is bonded to one O(13), one O(14), one O(18), one O(2), one O(5), and one O(8) atom to form a mixture of distorted edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 44°. The Co(2)-O(13) bond length is 1.85 Å. The Co(2)-O(14) bond length is 1.73 Å. The Co(2)-O(18) bond length is 1.88 Å. The Co(2)-O(2) bond length is 2.10 Å. The Co(2)-O(5) bond length is 2.19 Å. The Co(2)-O(8) bond length is 2.14 Å. In the third Co site, Co(3) is bonded to one O(14), one O(15), one O(16), one O(3), one O(6), and one O(9) atom to form a mixture of distorted edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 44°. The Co(3)-O(14) bond length is 1.74 Å. The Co(3)-O(15) bond length is 1.88 Å. The Co(3)-O(16) bond length is 1.88 Å. The Co(3)-O(3) bond length is 2.15 Å. The Co(3)-O(6) bond length is 2.22 Å. The Co(3)-O(9) bond length is 2.06 Å. In the fourth Co site, Co(4) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(16), one O(18), and one O(4) atom. The Co(4)-O(1) bond length is 2.12 Å. The Co(4)-O(10) bond length is 1.99 Å. The Co(4)-O(16) bond length is 1.79 Å. The Co(4)-O(18) bond length is 1.80 Å. The Co(4)-O(4) bond length is 2.01 Å. In the fifth Co site, Co(5) is bonded to one O(11), one O(15), one O(16), one O(17), one O(2), and one O(5) atom to form a mixture of distorted edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 44°. The Co(5)-O(11) bond length is 2.14 Å. The Co(5)-O(15) bond length is 1.88 Å. The Co(5)-O(16) bond length is 1.85 Å. The Co(5)-O(17) bond length is 1.73 Å. The Co(5)-O(2) bond length is 2.19 Å. The Co(5)-O(5) bond length is 2.10 Å. In the sixth Co site, Co(6) is bonded to one O(12), one O(13), one O(17), one O(18), one O(3), and one O(6) atom to form a mixture of distorted edge and corner-sharing CoO6 octahedra. The corner-sharing octahedral tilt angles are 44°. The Co(6)-O(12) bond length is 2.06 Å. The Co(6)-O(13) bond length is 1.89 Å. The Co(6)-O(17) bond length is 1.74 Å. The Co(6)-O(18) bond length is 1.88 Å. The Co(6)-O(3) bond length is 2.22 Å. The Co(6)-O(6) bond length is 2.15 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one H(1), one O(1), and one O(11) atom. The C(1)-H(1) bond length is 1.11 Å. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(11) bond length is 1.25 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one H(2), one O(12), and one O(2) atom. The C(2)-H(2) bond length is 1.11 Å. The C(2)-O(12) bond length is 1.25 Å. The C(2)-O(2) bond length is 1.29 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one H(3), one O(10), and one O(3) atom. The C(3)-H(3) bond length is 1.11 Å. The C(3)-O(10) bond length is 1.26 Å. The C(3)-O(3) bond length is 1.28 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one H(4), one O(4), and one O(8) atom. The C(4)-H(4) bond length is 1.11 Å. The C(4)-O(4) bond length is 1.29 Å. The C(4)-O(8) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one H(5), one O(5), and one O(9) atom. The C(5)-H(5) bond length is 1.11 Å. The C(5)-O(5) bond length is 1.29 Å. The C(5)-O(9) bond length is 1.25 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one H(6), one O(6), and one O(7) atom. The C(6)-H(6) bond length is 1.11 Å. The C(6)-O(6) bond length is 1.28 Å. The C(6)-O(7) bond length is 1.26 Å. There are six 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(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(6) atom. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(4), and one C(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Co(2), one Co(5), and one C(2) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Co(3), one Co(6), and one C(3) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Co(1), one Co(4), and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Co(2), one Co(5), and one C(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Co(3), one Co(6), and one C(6) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Co(1) and one C(6) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Co(2) and one C(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Co(3) and one C(5) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Co(4) and one C(3) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Co(5) and one C(1) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Co(6) and one C(2) atom. In the thirteenth O site, O(13) is bonded in a distorted T-shaped geometry to one Co(1), one Co(2), and one Co(6) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Co(2) and one Co(3) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to one Co(1), one Co(3), and one Co(5) atom. In the sixteenth O site, O(16) is bonded in a distorted T-shaped geometry to one Co(3), one Co(4), and one Co(5) atom. In the seventeenth O site, O(17) is bonded in a distorted bent 150 degrees geometry to one Co(5) and one Co(6) atom. In the eighteenth O site, O(18) is bonded in a distorted T-shaped geometry to one Co(2), one Co(4), and one Co(6) atom. Linkers: 6 [O]C=O. Metal clusters: 6 [Co]. RCSR code: qtz-f. The MOF has largest included sphere 2.68 A, density 2.95 g/cm3, surface area 1877.30 m2/g, accessible volume 0.08 cm3/g