NiH5(C2O)4CH crystallizes in the triclinic P-1 space group. The structure consists of eight 02329_fluka molecules inside a NiH5(C2O)4 framework. In the NiH5(C2O)4 framework, there are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(10), one O(14), one O(15), one O(16), one O(2), and one O(6) atom to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 57-72°. The Ni(1)-O(10) bond length is 2.00 Å. The Ni(1)-O(14) bond length is 2.02 Å. The Ni(1)-O(15) bond length is 2.10 Å. The Ni(1)-O(16) bond length is 2.10 Å. The Ni(1)-O(2) bond length is 2.20 Å. The Ni(1)-O(6) bond length is 1.96 Å. In the second Ni site, Ni(2) is bonded to one O(1), one O(12), one O(13), one O(4), one O(5), and one O(6) atom to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 57-72°. The Ni(2)-O(1) bond length is 2.08 Å. The Ni(2)-O(12) bond length is 2.04 Å. The Ni(2)-O(13) bond length is 2.02 Å. The Ni(2)-O(4) bond length is 2.20 Å. The Ni(2)-O(5) bond length is 1.99 Å. The Ni(2)-O(6) bond length is 2.02 Å. In the third Ni site, Ni(3) is bonded to one O(11), one O(15), one O(16), one O(3), one O(4), and one O(5) atom to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 56-72°. The Ni(3)-O(11) bond length is 1.98 Å. The Ni(3)-O(15) bond length is 2.08 Å. The Ni(3)-O(16) bond length is 2.12 Å. The Ni(3)-O(3) bond length is 2.03 Å. The Ni(3)-O(4) bond length is 2.20 Å. The Ni(3)-O(5) bond length is 1.95 Å. In the fourth Ni site, Ni(4) is bonded to one O(2), one O(5), one O(6), one O(7), one O(8), and one O(9) atom to form a mixture of edge and corner-sharing NiO6 octahedra. The corner-sharing octahedral tilt angles range from 56-72°. The Ni(4)-O(2) bond length is 2.18 Å. The Ni(4)-O(5) bond length is 2.03 Å. The Ni(4)-O(6) bond length is 2.01 Å. The Ni(4)-O(7) bond length is 2.03 Å. The Ni(4)-O(8) bond length is 2.05 Å. The Ni(4)-O(9) bond length is 2.02 Å. There are thirty-two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(14), and one O(7) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(14) bond length is 1.28 Å. The C(1)-O(7) bond length is 1.27 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(11), and one C(3) atom. The C(2)-C(11) bond length is 1.43 Å. The C(2)-C(3) bond length is 1.39 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(7) atom. The C(3)-C(4) bond length is 1.41 Å. The C(3)-H(7) bond length is 1.09 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(8) atom. The C(4)-C(5) bond length is 1.38 Å. The C(4)-H(8) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(12), one C(4), and one C(6) atom. The C(5)-C(12) bond length is 1.50 Å. The C(5)-C(6) bond length is 1.43 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(11), one C(5), and one C(7) atom. The C(6)-C(11) bond length is 1.44 Å. The C(6)-C(7) bond length is 1.42 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(6) and one H(9) atom. The C(7)-H(9) bond length is 1.09 Å. In the eighth C site, C(10) is bonded in a distorted single-bond geometry to one C(11) and one H(12) atom. The C(10)-C(11) bond length is 1.42 Å. The C(10)-H(12) bond length is 1.09 Å. In the ninth C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(2), and one C(6) atom. In the tenth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(13), and one O(3) atom. The C(12)-O(13) bond length is 1.27 Å. The C(12)-O(3) bond length is 1.28 Å. In the eleventh C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(14), one O(1), and one O(11) atom. The C(13)-C(14) bond length is 1.50 Å. The C(13)-O(1) bond length is 1.28 Å. The C(13)-O(11) bond length is 1.27 Å. In the twelfth C site, C(14) is bonded in a trigonal planar geometry to one C(13), one C(15), and one C(23) atom. The C(14)-C(15) bond length is 1.38 Å. The C(14)-C(23) bond length is 1.43 Å. In the thirteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(14) and one H(13) atom. The C(15)-H(13) bond length is 1.09 Å. In the fourteenth C site, C(16) is bonded in a distorted single-bond geometry to one C(17) and one H(14) atom. The C(16)-C(17) bond length is 1.39 Å. The C(16)-H(14) bond length is 1.09 Å. In the fifteenth C site, C(17) is bonded in a trigonal planar geometry to one C(16), one C(18), and one C(24) atom. The C(17)-C(18) bond length is 1.44 Å. The C(17)-C(24) bond length is 1.49 Å. In the sixteenth C site, C(18) is bonded in a trigonal planar geometry to one C(17), one C(19), and one C(23) atom. The C(18)-C(19) bond length is 1.42 Å. The C(18)-C(23) bond length is 1.44 Å. In the seventeenth C site, C(19) is bonded in a distorted single-bond geometry to one C(18) and one H(15) atom. The C(19)-H(15) bond length is 1.09 Å. In the eighteenth C site, C(22) is bonded in a distorted single-bond geometry to one C(23) and one H(18) atom. The C(22)-C(23) bond length is 1.42 Å. The C(22)-H(18) bond length is 1.09 Å. In the nineteenth C site, C(23) is bonded in a trigonal planar geometry to one C(14), one C(18), and one C(22) atom. In the twentieth C site, C(24) is bonded in a distorted bent 120 degrees geometry to one C(17), one O(16), and one O(9) atom. The C(24)-O(16) bond length is 1.30 Å. The C(24)-O(9) bond length is 1.26 Å. In the twenty-first C site, C(25) is bonded in a distorted bent 120 degrees geometry to one C(26), one O(12), and one O(15) atom. The C(25)-C(26) bond length is 1.49 Å. The C(25)-O(12) bond length is 1.26 Å. The C(25)-O(15) bond length is 1.30 Å. In the twenty-second C site, C(26) is bonded in a trigonal planar geometry to one C(25), one C(27), and one C(35) atom. The C(26)-C(27) bond length is 1.39 Å. The C(26)-C(35) bond length is 1.44 Å. In the twenty-third C site, C(27) is bonded in a distorted single-bond geometry to one C(26) and one H(19) atom. The C(27)-H(19) bond length is 1.09 Å. In the twenty-fourth C site, C(28) is bonded in a distorted single-bond geometry to one C(29) and one H(20) atom. The C(28)-C(29) bond length is 1.38 Å. The C(28)-H(20) bond length is 1.09 Å. In the twenty-fifth C site, C(29) is bonded in a trigonal planar geometry to one C(28), one C(30), and one C(36) atom. The C(29)-C(30) bond length is 1.43 Å. The C(29)-C(36) bond length is 1.50 Å. In the twenty-sixth C site, C(30) is bonded in a trigonal planar geometry to one C(29), one C(31), and one C(35) atom. The C(30)-C(31) bond length is 1.42 Å. The C(30)-C(35) bond length is 1.44 Å. In the twenty-seventh C site, C(31) is bonded in a distorted single-bond geometry to one C(30), one C(32), and one H(21) atom. The C(31)-C(32) bond length is 1.38 Å. The C(31)-H(21) bond length is 1.09 Å. In the twenty-eighth C site, C(32) is bonded in a distorted trigonal planar geometry to one C(31), one C(33), and one H(22) atom. The C(32)-C(33) bond length is 1.41 Å. The C(32)-H(22) bond length is 1.09 Å. In the twenty-ninth C site, C(33) is bonded in a distorted single-bond geometry to one C(32) and one H(23) atom. The C(33)-H(23) bond length is 1.09 Å. In the thirtieth C site, C(34) is bonded in a distorted single-bond geometry to one C(35) and one H(24) atom. The C(34)-C(35) bond length is 1.42 Å. The C(34)-H(24) bond length is 1.09 Å. In the thirty-first C site, C(35) is bonded in a trigonal planar geometry to one C(26), one C(30), and one C(34) atom. In the thirty-second C site, C(36) is bonded in a distorted bent 120 degrees geometry to one C(29), one O(10), and one O(8) atom. The C(36)-O(10) bond length is 1.27 Å. The C(36)-O(8) bond length is 1.27 Å. There are twenty inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(2) atom. The H(2)-O(2) bond length is 0.98 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(4) atom. The H(3)-O(4) bond length is 0.98 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. The H(4)-O(4) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(5) atom. The H(5)-O(5) bond length is 0.98 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(6) atom. The H(6)-O(6) bond length is 0.98 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(3) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(4) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(7) atom. In the tenth H site, H(12) is bonded in a single-bond geometry to one C(10) atom. In the eleventh H site, H(13) is bonded in a single-bond geometry to one C(15) atom. In the twelfth H site, H(14) is bonded in a single-bond geometry to one C(16) atom. In the thirteenth H site, H(15) is bonded in a single-bond geometry to one C(19) atom. In the fourteenth H site, H(18) is bonded in a single-bond geometry to one C(22) atom. In the fifteenth H site, H(19) is bonded in a single-bond geometry to one C(27) atom. In the sixteenth H site, H(20) is bonded in a single-bond geometry to one C(28) atom. In the seventeenth H site, H(21) is bonded in a single-bond geometry to one C(31) atom. In the eighteenth H site, H(22) is bonded in a single-bond geometry to one C(32) atom. In the nineteenth H site, H(23) is bonded in a single-bond geometry to one C(33) atom. In the twentieth H site, H(24) is bonded in a single-bond geometry to one C(34) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ni(2) and one C(13) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to one Ni(1), one Ni(4), one H(1), and one H(2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ni(3) and one C(12) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Ni(2), one Ni(3), one H(3), and one H(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ni(2), one Ni(3), one Ni(4), and one H(5) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ni(1), one Ni(2), one Ni(4), and one H(6) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ni(4) and one C(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ni(4) and one C(36) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ni(4) and one C(24) atom. In the tenth O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Ni(1) and one C(36) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Ni(3) and one C(13) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Ni(2) and one C(25) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 120 degrees geometry to one Ni(2) and one C(12) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Ni(1) and one C(1) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Ni(1), one Ni(3), and one C(25) atom. In the sixteenth O site, O(16) is bonded in a 3-coordinate geometry to one Ni(1), one Ni(3), and one C(24) atom. Linkers: 6 [O]C(=O)c1ccc(C([O])=O)c2ccccc12. Metal clusters: 8 [Ni]. The MOF has largest included sphere 3.47 A, density 1.68 g/cm3, surface area 3538.58 m2/g, accessible volume 0.18 cm3/g