NiC12H10(NO)4(CH3)2 crystallizes in the monoclinic P2_1/c space group. The structure consists of four 02329_fluka molecules inside a NiC12H10(NO)4 framework. In the NiC12H10(NO)4 framework, Ni(1) is bonded in a square co-planar geometry to two equivalent N(2) and two equivalent O(2) atoms. Both Ni(1)-N(2) bond lengths are 1.88 Å. Both Ni(1)-O(2) bond lengths are 1.89 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one N(1) atom. The C(1)-C(2) bond length is 1.43 Å. The C(1)-C(3) bond length is 1.39 Å. The C(1)-N(1) bond length is 1.38 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one N(2) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-N(2) bond length is 1.39 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(1), one C(2), and one H(2) atom. 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(5), one N(1), and one N(2) atom. The C(4)-C(5) bond length is 1.48 Å. The C(4)-N(1) bond length is 1.36 Å. The C(4)-N(2) bond length is 1.34 Å. In the fifth C site, C(5) is bonded in a distorted trigonal non-coplanar geometry to one C(4), one H(3), one H(4), and one H(5) atom. The C(5)-H(3) bond length is 1.10 Å. The C(5)-H(4) bond length is 1.10 Å. The C(5)-H(5) bond length is 1.10 Å. In the sixth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(7)-O(1) bond length is 1.26 Å. The C(7)-O(2) bond length is 1.29 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Ni(1), one C(2), and one C(4) atom. In the second N site, N(1) is bonded in a trigonal planar geometry to one C(1), one C(4), and one H(1) atom. The N(1)-H(1) bond length is 1.05 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a distorted bent 150 degrees geometry to one N(1) and one O(1) atom. The H(1)-O(1) bond length is 1.63 Å. 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(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one C(7) and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ni(1) and one C(7) atom. Linkers: 2 [CH2]c1nc2cc3[nH]c(C)nc3cc2[nH]1 ,2 Cc1nc2cc3[nH]c(C)nc3cc2[nH]1. Metal clusters: 2 [Ni]. The MOF has largest included sphere 2.33 A, density 1.58 g/cm3, surface area 4924.16 m2/g, accessible volume 0.18 cm3/g