Ni2C15N2H12O7 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Ni sites. In the first Ni site, Ni(1) is bonded to one O(10), one O(12), one O(2), one O(3), and one O(9) atom to form a mixture of edge and corner-sharing NiO5 square pyramids. The corner-sharing octahedral tilt angles are 49°. The Ni(1)-O(10) bond length is 2.03 Å. The Ni(1)-O(12) bond length is 2.04 Å. The Ni(1)-O(2) bond length is 2.15 Å. The Ni(1)-O(3) bond length is 2.00 Å. The Ni(1)-O(9) bond length is 2.08 Å. In the second Ni site, Ni(2) is bonded in a rectangular see-saw-like geometry to one O(1), one O(13), one O(7), and one O(8) atom. The Ni(2)-O(1) bond length is 2.16 Å. The Ni(2)-O(13) bond length is 2.05 Å. The Ni(2)-O(7) bond length is 1.99 Å. The Ni(2)-O(8) bond length is 2.04 Å. In the third Ni site, Ni(3) is bonded to one N(3), one O(1), one O(3), one O(4), one O(6), and one O(7) atom to form NiNO5 octahedra that share  a cornercorner with one Ni(1)O5 square pyramid and  an edgeedge with one Ni(4)NO5 octahedra. The Ni(3)-N(3) bond length is 2.07 Å. The Ni(3)-O(1) bond length is 2.10 Å. The Ni(3)-O(3) bond length is 2.04 Å. The Ni(3)-O(4) bond length is 2.04 Å. The Ni(3)-O(6) bond length is 2.05 Å. The Ni(3)-O(7) bond length is 2.06 Å. In the fourth Ni site, Ni(4) is bonded to one N(1), one O(11), one O(2), one O(3), one O(5), and one O(7) atom to form NiNO5 octahedra that share  an edgeedge with one Ni(3)NO5 octahedra and  an edgeedge with one Ni(1)O5 square pyramid. The Ni(4)-N(1) bond length is 2.06 Å. The Ni(4)-O(11) bond length is 2.05 Å. The Ni(4)-O(2) bond length is 2.10 Å. The Ni(4)-O(3) bond length is 2.05 Å. The Ni(4)-O(5) bond length is 2.05 Å. The Ni(4)-O(7) bond length is 2.03 Å. There are thirty inequivalent C sites. In the first C site, C(17) is bonded in a trigonal planar geometry to one C(11), one C(12), and one C(23) atom. The C(17)-C(11) bond length is 1.49 Å. The C(17)-C(12) bond length is 1.39 Å. The C(17)-C(23) bond length is 1.39 Å. In the second C site, C(18) is bonded in a 2-coordinate geometry to one N(3) and one H(8) atom. The C(18)-N(3) bond length is 1.33 Å. The C(18)-H(8) bond length is 0.93 Å. In the third C site, C(19) is bonded in a distorted trigonal planar geometry to one C(1), one C(27), and one N(4) atom. The C(19)-C(1) bond length is 1.40 Å. The C(19)-C(27) bond length is 1.51 Å. The C(19)-N(4) bond length is 1.34 Å. In the fourth C site, C(20) is bonded in a trigonal planar geometry to one C(25), one C(3), and one N(2) atom. The C(20)-C(25) bond length is 1.50 Å. The C(20)-C(3) bond length is 1.40 Å. The C(20)-N(2) bond length is 1.35 Å. In the fifth C site, C(21) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(9) atom. The C(21)-C(1) bond length is 1.39 Å. The C(21)-C(5) bond length is 1.38 Å. The C(21)-H(9) bond length is 0.93 Å. In the sixth C site, C(22) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(10) atom. The C(22)-N(1) bond length is 1.34 Å. The C(22)-H(10) bond length is 0.93 Å. In the seventh C site, C(23) is bonded in a distorted single-bond geometry to one C(17) and one H(11) atom. The C(23)-H(11) bond length is 0.93 Å. In the eighth C site, C(24) is bonded in a distorted bent 120 degrees geometry to one C(16), one O(14), and one O(9) atom. The C(24)-C(16) bond length is 1.51 Å. The C(24)-O(14) bond length is 1.26 Å. The C(24)-O(9) bond length is 1.26 Å. In the ninth C site, C(25) is bonded in a trigonal non-coplanar geometry to one C(20); one H(13); and two equivalent H(12,14) atoms. The C(25)-H(13) bond length is 0.96 Å. Both C(25)-H(12,14) bond lengths are 0.96 Å. In the tenth C site, C(26) is bonded in a trigonal non-coplanar geometry to one C(13); one H(15); and two equivalent H(16,17) atoms. The C(26)-C(13) bond length is 1.49 Å. The C(26)-H(15) bond length is 0.96 Å. Both C(26)-H(16,17) bond lengths are 0.96 Å. In the eleventh C site, C(27) is bonded in a trigonal non-coplanar geometry to one C(19); one H(18); and two equivalent H(19,20) atoms. The C(27)-H(18) bond length is 0.96 Å. Both C(27)-H(19,20) bond lengths are 0.96 Å. In the twelfth C site, C(28) is bonded in a distorted trigonal planar geometry to one C(16), one C(2), and one H(21) atom. The C(28)-C(16) bond length is 1.38 Å. The C(28)-C(2) bond length is 1.38 Å. The C(28)-H(21) bond length is 0.93 Å. In the thirteenth C site, C(29) is bonded in a trigonal planar geometry to one C(30), one C(5), and one N(4) atom. The C(29)-C(30) bond length is 1.51 Å. The C(29)-C(5) bond length is 1.39 Å. The C(29)-N(4) bond length is 1.35 Å. In the fourteenth C site, C(30) is bonded in a trigonal non-coplanar geometry to one C(29), one H(22), one H(23), and one H(24) atom. The C(30)-H(22) bond length is 0.96 Å. The C(30)-H(23) bond length is 0.96 Å. The C(30)-H(24) bond length is 0.96 Å. In the fifteenth C site, C(1) is bonded in a trigonal planar geometry to one C(14), one C(19), and one C(21) atom. The C(1)-C(14) bond length is 1.50 Å. In the sixteenth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(28), one N(3), and one H(3) atom. The C(2)-N(3) bond length is 1.35 Å. The C(2)-H(3) bond length is 0.93 Å. In the seventeenth C site, C(3) is bonded in a trigonal planar geometry to one C(20), one C(6), and one C(8) atom. The C(3)-C(6) bond length is 1.37 Å. The C(3)-C(8) bond length is 1.51 Å. In the eighteenth C site, C(4) is bonded in a distorted single-bond geometry to one C(16) and one H(4) atom. The C(4)-C(16) bond length is 1.39 Å. The C(4)-H(4) bond length is 0.93 Å. In the nineteenth C site, C(5) is bonded in a trigonal planar geometry to one C(10), one C(21), and one C(29) atom. The C(5)-C(10) bond length is 1.52 Å. In the twentieth C site, C(6) is bonded in a single-bond geometry to one C(15), one C(3), and one H(5) atom. The C(6)-C(15) bond length is 1.39 Å. The C(6)-H(5) bond length is 0.93 Å. In the twenty-first C site, C(7) is bonded in a distorted trigonal planar geometry to one C(12), one N(1), and one H(6) atom. The C(7)-C(12) bond length is 1.36 Å. The C(7)-N(1) bond length is 1.34 Å. The C(7)-H(6) bond length is 0.93 Å. In the twenty-second C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(2), and one O(8) atom. The C(8)-O(2) bond length is 1.27 Å. The C(8)-O(8) bond length is 1.26 Å. In the twenty-third C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(15), one O(1), and one O(10) atom. The C(9)-C(15) bond length is 1.50 Å. The C(9)-O(1) bond length is 1.27 Å. The C(9)-O(10) bond length is 1.25 Å. In the twenty-fourth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(13), and one O(4) atom. The C(10)-O(13) bond length is 1.27 Å. The C(10)-O(4) bond length is 1.24 Å. In the twenty-fifth C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(17), one O(5), and one O(6) atom. The C(11)-O(5) bond length is 1.27 Å. The C(11)-O(6) bond length is 1.26 Å. In the twenty-sixth C site, C(12) is bonded in a distorted single-bond geometry to one C(17), one C(7), and one H(7) atom. The C(12)-H(7) bond length is 0.93 Å. In the twenty-seventh C site, C(13) is bonded in a trigonal planar geometry to one C(15), one C(26), and one N(2) atom. The C(13)-C(15) bond length is 1.41 Å. The C(13)-N(2) bond length is 1.36 Å. In the twenty-eighth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(11), and one O(12) atom. The C(14)-O(11) bond length is 1.26 Å. The C(14)-O(12) bond length is 1.27 Å. In the twenty-ninth C site, C(15) is bonded in a trigonal planar geometry to one C(13), one C(6), and one C(9) atom. In the thirtieth C site, C(16) is bonded in a trigonal planar geometry to one C(24), one C(28), and one C(4) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Ni(4), one C(22), and one C(7) atom. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one C(13) and one C(20) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one Ni(3), one C(18), and one C(2) atom. In the fourth N site, N(4) is bonded in a bent 120 degrees geometry to one C(19) and one C(29) atom. There are twenty-one inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 0.98 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(2) 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(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(7) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(12) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(18) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(21) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(22) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(23) atom. In the twelfth H site, H(12,14) is bonded in a single-bond geometry to one C(25) atom. In the thirteenth H site, H(13) is bonded in a single-bond geometry to one C(25) atom. In the fourteenth H site, H(15) is bonded in a single-bond geometry to one C(26) atom. In the fifteenth H site, H(16,17) is bonded in a single-bond geometry to one C(26) atom. In the sixteenth H site, H(18) is bonded in a single-bond geometry to one C(27) atom. In the seventeenth H site, H(19,20) is bonded in a single-bond geometry to one C(27) atom. In the eighteenth H site, H(21) is bonded in a single-bond geometry to one C(28) atom. In the nineteenth H site, H(22) is bonded in a single-bond geometry to one C(30) atom. In the twentieth H site, H(23) is bonded in a single-bond geometry to one C(30) atom. In the twenty-first H site, H(24) is bonded in a single-bond geometry to one C(30) atom. There are fourteen inequivalent O sites. In the first O site, O(12) is bonded in a bent 120 degrees geometry to one Ni(1) and one C(14) atom. In the second O site, O(13) is bonded in a distorted single-bond geometry to one Ni(2) and one C(10) atom. In the third O site, O(14) is bonded in a single-bond geometry to one C(24) atom. In the fourth O site, O(9) is bonded in a bent 120 degrees geometry to one Ni(1) and one C(24) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ni(4) and one C(11) atom. In the sixth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Ni(1) and one C(9) atom. In the seventh O site, O(8) is bonded in a distorted single-bond geometry to one Ni(2) and one C(8) atom. In the eighth O site, O(7) is bonded in a distorted single-bond geometry to one Ni(2), one Ni(3), one Ni(4), and one H(2) atom. In the ninth O site, O(6) is bonded in a bent 120 degrees geometry to one Ni(3) and one C(11) atom. In the tenth O site, O(1) is bonded in a 3-coordinate geometry to one Ni(2), one Ni(3), and one C(9) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one Ni(4) and one C(14) atom. In the twelfth O site, O(2) is bonded in a 3-coordinate geometry to one Ni(1), one Ni(4), and one C(8) atom. In the thirteenth O site, O(3) is bonded in a distorted single-bond geometry to one Ni(1), one Ni(3), one Ni(4), and one H(1) atom. In the fourteenth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ni(3) and one C(10) atom. Linkers: 8 Cc1nc(C)c(C([O])=O)cc1C([O])=O ,8 [O]C(=O)c1ccncc1. Metal clusters: 4 O=[C]O[Ni]1(O)O[C]O[Ni]2O[C]O[Ni](O)O[C]O[Ni](O[C]O2)O[C]O1. The MOF has largest included sphere 6.48 A, density 1.06 g/cm3, surface area 3670.74 m2/g, accessible volume 0.57 cm3/g