SrC21H15(NO4)2 crystallizes in the tetragonal I4_1/a space group. The structure consists of a SrC21H15(NO4)2 framework. Sr(1) is bonded in a 8-coordinate geometry to one H(9), one O(2), one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms. The Sr(1)-H(9) bond length is 2.52 Å. The Sr(1)-O(2) bond length is 2.59 Å. The Sr(1)-O(4) bond length is 2.57 Å. The Sr(1)-O(5) bond length is 2.55 Å. There is one shorter (2.51 Å) and one longer (2.72 Å) Sr(1)-O(1) bond length. There is one shorter (2.48 Å) and one longer (2.68 Å) Sr(1)-O(3) bond length. There are twenty-one inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(3), one O(1), and one O(5) atom. The C(1)-C(3) bond length is 1.52 Å. The C(1)-O(1) bond length is 1.23 Å. The C(1)-O(5) bond length is 1.23 Å. In the second C site, C(2) is bonded in a 4-coordinate geometry to one C(19), one N(1), one H(9), and one O(2) atom. The C(2)-C(19) bond length is 1.08 Å. The C(2)-N(1) bond length is 1.35 Å. The C(2)-H(9) bond length is 1.42 Å. The C(2)-O(2) bond length is 1.34 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(1), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.37 Å. The C(3)-C(5) bond length is 1.38 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(8), and one H(1) atom. The C(4)-C(8) bond length is 1.36 Å. The C(4)-H(1) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a single-bond geometry to one C(3), one C(9), and one H(2) atom. The C(5)-C(9) bond length is 1.38 Å. The C(5)-H(2) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a distorted tetrahedral geometry to one N(1), one H(3), one H(4), and one H(5) atom. The C(6)-N(1) bond length is 1.58 Å. The C(6)-H(3) bond length is 0.97 Å. The C(6)-H(4) bond length is 0.96 Å. The C(6)-H(5) bond length is 0.96 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(3), and one O(4) atom. The C(7)-C(8) bond length is 1.52 Å. The C(7)-O(3) bond length is 1.27 Å. The C(7)-O(4) bond length is 1.24 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(10), one C(4), and one C(7) atom. The C(8)-C(10) bond length is 1.39 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(11), and one C(5) atom. The C(9)-C(10) bond length is 1.37 Å. The C(9)-C(11) bond length is 1.44 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(8), one C(9), and one H(6) atom. The C(10)-H(6) bond length is 0.93 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(12), one C(13), and one C(9) atom. The C(11)-C(12) bond length is 1.41 Å. The C(11)-C(13) bond length is 1.38 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(11), one C(14), and one O(6) atom. The C(12)-C(14) bond length is 1.53 Å. The C(12)-O(6) bond length is 1.20 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(11), one C(15), and one O(7) atom. The C(13)-C(15) bond length is 1.47 Å. The C(13)-O(7) bond length is 1.20 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(12), one C(16), and one C(17) atom. The C(14)-C(16) bond length is 1.41 Å. The C(14)-C(17) bond length is 1.37 Å. In the fifteenth C site, C(15) is bonded in a trigonal planar geometry to one C(13), one C(16), and one C(18) atom. The C(15)-C(16) bond length is 1.41 Å. The C(15)-C(18) bond length is 1.33 Å. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(14), one C(15), and one C(16) atom. The C(16)-C(16) bond length is 1.41 Å. In the seventeenth C site, C(17) is bonded in a distorted single-bond geometry to one C(14) and one H(7) atom. The C(17)-H(7) bond length is 0.93 Å. In the eighteenth C site, C(18) is bonded in a single-bond geometry to one C(15) and one H(8) atom. The C(18)-H(8) bond length is 0.93 Å. In the nineteenth C site, C(19) is bonded in a 4-coordinate geometry to one C(2), one N(2), one H(9), and one O(2) atom. The C(19)-N(2) bond length is 1.30 Å. The C(19)-H(9) bond length is 1.42 Å. The C(19)-O(2) bond length is 1.35 Å. In the twentieth C site, C(20) is bonded to one N(2), one H(10), one H(11), and one H(12) atom to form corner-sharing CH3N tetrahedra. The C(20)-N(2) bond length is 1.37 Å. The C(20)-H(10) bond length is 0.97 Å. The C(20)-H(11) bond length is 0.96 Å. The C(20)-H(12) bond length is 0.96 Å. In the twenty-first C site, C(21) is bonded to one N(2), one H(13), one H(14), and one H(15) atom to form distorted corner-sharing CH3N tetrahedra. The C(21)-N(2) bond length is 1.56 Å. The C(21)-H(13) bond length is 0.96 Å. The C(21)-H(14) bond length is 0.96 Å. The C(21)-H(15) bond length is 0.97 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted bent 120 degrees geometry to one C(2) and one C(6) atom. In the second N site, N(2) is bonded in a distorted T-shaped geometry to one C(19), one C(20), and one C(21) atom. There are fifteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(5) 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(6) atom. In the fifth H site, H(5) is bonded in a distorted 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(10) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(17) 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 Sr(1), one C(19), one C(2), and one O(2) atom. The H(9)-O(2) bond length is 1.05 Å. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(20) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(20) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(20) atom. In the thirteenth H site, H(13) is bonded in a distorted linear geometry to one C(21) and one O(8) atom. The H(13)-O(8) bond length is 1.18 Å. In the fourteenth H site, H(14) is bonded in a single-bond geometry to one C(21) atom. In the fifteenth H site, H(15) is bonded in a single-bond geometry to one C(21) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one C(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one Sr(1), one C(19), one C(2), and one H(9) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Sr(1) and one C(7) atom. In the fourth O site, O(4) is bonded in a distorted L-shaped geometry to one Sr(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(12) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one C(13) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one H(13) atom. Linkers: 8 [O]C(=O)c1cc([C]2C(=O)c3ccc4c5c(ccc(c35)C2=O)C(=O)[C](c2cc(C([O])=O)cc(C([O])=O)c2)C4=O)cc(C([O])=O)c1. Metal clusters: 16 [Sr]. The MOF has largest included sphere 6.86 A, density 1.23 g/cm3, surface area 4319.40 m2/g, accessible volume 0.32 cm3/g