Ni2C17H10O9 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(5), one O(8), and one O(9) atom. The Ni(1)-O(2) bond length is 2.00 Å. The Ni(1)-O(5) bond length is 2.06 Å. The Ni(1)-O(8) bond length is 2.04 Å. The Ni(1)-O(9) bond length is 2.08 Å. In the second Ni site, Ni(2) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(4), one O(7), and one O(9) atom. The Ni(2)-O(1) bond length is 2.00 Å. The Ni(2)-O(4) bond length is 2.08 Å. The Ni(2)-O(7) bond length is 2.02 Å. The Ni(2)-O(9) bond length is 2.07 Å. There are seventeen inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(14), one C(2), and one C(6) atom. The C(1)-C(14) bond length is 1.51 Å. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.38 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(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-H(1) 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(4), and one C(7) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-C(7) bond length is 1.51 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(2) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(17), one C(4), and one C(6) atom. The C(5)-C(17) bond length is 1.51 Å. The C(5)-C(6) bond length is 1.40 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(3) atom. The C(6)-H(3) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a water-like geometry to one C(3), one C(8), one H(4), and one H(5) atom. The C(7)-C(8) bond length is 1.54 Å. The C(7)-H(4) bond length is 0.97 Å. The C(7)-H(5) bond length is 0.97 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(13), one C(7), and one C(9) atom. The C(8)-C(13) bond length is 1.38 Å. The C(8)-C(9) bond length is 1.40 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(10), one C(8), and one H(6) atom. The C(9)-C(10) bond length is 1.41 Å. The C(9)-H(6) bond length is 0.93 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(9) atom. The C(10)-C(11) bond length is 1.38 Å. The C(10)-C(15) bond length is 1.50 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(10), one C(12), and one H(7) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-H(7) bond length is 0.93 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(16) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-C(16) bond length is 1.51 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(12), one C(8), and one H(8) atom. The C(13)-H(8) bond length is 0.93 Å. In the fourteenth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(14)-O(1) bond length is 1.27 Å. The C(14)-O(2) bond length is 1.25 Å. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(3), and one O(4) atom. The C(15)-O(3) bond length is 1.25 Å. The C(15)-O(4) bond length is 1.26 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(5), and one O(6) atom. The C(16)-O(5) bond length is 1.25 Å. The C(16)-O(6) bond length is 1.27 Å. In the seventeenth C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(7), and one O(8) atom. The C(17)-O(7) bond length is 1.25 Å. The C(17)-O(8) bond length is 1.26 Å. There are ten 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(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(7) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(11) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(13) atom. In the ninth H site, H(9) is bonded in a distorted single-bond geometry to one O(3) atom. The H(9)-O(3) bond length is 0.82 Å. In the tenth H site, H(10) is bonded in a single-bond geometry to one O(9) atom. The H(10)-O(9) bond length is 0.95 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to one Ni(2) and one C(14) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ni(1) and one C(14) atom. In the third O site, O(3) is bonded in a water-like geometry to one C(15) and one H(9) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one Ni(2) and one C(15) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Ni(1) and one C(16) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(16) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ni(2) and one C(17) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Ni(1) and one C(17) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ni(1), one Ni(2), and one H(10) atom. Linkers: 4 [O]C(=O)c1cc(Cc2cc(C([O])=O)cc(C(=O)O)c2)cc(C([O])=O)c1. Metal clusters: 4 O=[C]O[Ni]1O[C]O[Ni](O)(O[C]O)O[C]O1. RCSR code: crb. The MOF has largest included sphere 7.86 A, density 0.98 g/cm3, surface area 3874.62 m2/g, accessible volume 0.63 cm3/g