SrC5H2(NO2)2 crystallizes in the trigonal R3c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted pentagonal bipyramidal geometry to one O(1), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The Sr(1)-O(1) bond length is 2.61 Å. The Sr(1)-O(2) bond length is 2.47 Å. The Sr(1)-O(3) bond length is 2.52 Å. The Sr(1)-O(4) bond length is 2.63 Å. The Sr(1)-O(5) bond length is 2.55 Å. The Sr(1)-O(6) bond length is 2.45 Å. The Sr(1)-O(7) bond length is 2.49 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one N(1), one N(4), one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(8) atoms. The Sr(2)-N(1) bond length is 2.71 Å. The Sr(2)-N(4) bond length is 2.73 Å. The Sr(2)-O(1) bond length is 2.68 Å. The Sr(2)-O(2) bond length is 2.88 Å. The Sr(2)-O(3) bond length is 2.68 Å. The Sr(2)-O(4) bond length is 2.99 Å. The Sr(2)-O(7) bond length is 2.65 Å. There is one shorter (2.58 Å) and one longer (2.74 Å) Sr(2)-O(8) bond length. There are ten inequivalent C sites. In the first C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(5)-C(3) bond length is 1.49 Å. The C(5)-O(3) bond length is 1.28 Å. The C(5)-O(4) bond length is 1.27 Å. In the second C site, C(6) is bonded in a trigonal planar geometry to one N(3), one N(4), and one H(4) atom. The C(6)-N(3) bond length is 1.35 Å. The C(6)-N(4) bond length is 1.33 Å. The C(6)-H(4) bond length is 1.08 Å. In the third C site, C(7) is bonded in a 3-coordinate geometry to one C(8), one C(9), and one N(3) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-C(9) bond length is 1.49 Å. The C(7)-N(3) bond length is 1.38 Å. In the fourth C site, C(8) is bonded in a distorted single-bond geometry to one C(10), one C(7), and one N(4) atom. The C(8)-C(10) bond length is 1.48 Å. The C(8)-N(4) bond length is 1.38 Å. In the fifth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.27 Å. The C(9)-O(6) bond length is 1.27 Å. In the sixth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(7), and one O(8) atom. The C(10)-O(7) bond length is 1.28 Å. The C(10)-O(8) bond length is 1.28 Å. In the seventh C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(3) atom. The C(1)-N(1) bond length is 1.33 Å. The C(1)-N(2) bond length is 1.35 Å. The C(1)-H(3) bond length is 1.08 Å. In the eighth C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one C(4), and one N(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(4) bond length is 1.48 Å. The C(2)-N(1) bond length is 1.38 Å. In the ninth C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one N(2) atom. The C(3)-N(2) bond length is 1.37 Å. In the tenth C site, C(4) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(4)-O(1) bond length is 1.29 Å. The C(4)-O(2) bond length is 1.26 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a distorted water-like geometry to one Sr(2), one C(1), and one C(2) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one H(1) atom. The N(2)-H(1) bond length is 1.05 Å. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(6), one C(7), and one H(2) atom. The N(3)-H(2) bond length is 1.05 Å. In the fourth N site, N(4) is bonded in a distorted water-like geometry to one Sr(2), one C(6), and one C(8) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a distorted linear geometry to one N(2) and one O(1) atom. The H(1)-O(1) bond length is 1.65 Å. In the second H site, H(2) is bonded in a single-bond geometry to one N(3) and one O(5) atom. The H(2)-O(5) bond length is 1.74 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(6) atom. There are eight inequivalent O sites. In the first O site, O(5) is bonded in a 3-coordinate geometry to one Sr(1), one C(9), and one H(2) atom. In the second O site, O(6) is bonded in a bent 150 degrees geometry to one Sr(1) and one C(9) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one C(10) atom. In the fourth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Sr(2) and one C(10) atom. In the fifth O site, O(1) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one C(4), and one H(1) atom. In the sixth O site, O(2) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one C(4) atom. In the seventh O site, O(3) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one C(5) atom. In the eighth O site, O(4) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(2), and one C(5) atom. Linkers: 12 [O]C(=O)c1nc[nH]c1C([O])=O. Metal clusters: 12 [Sr]. The MOF has largest included sphere 4.92 A, density 2.25 g/cm3, surface area 2369.18 m2/g, accessible volume 0.10 cm3/g