SrC2N4H2O3 crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one N(1), one N(10), one N(13), one N(6), one O(1), one O(10), one O(2), one O(7), and one O(9) atom. The Sr(1)-N(1) bond length is 2.71 Å. The Sr(1)-N(10) bond length is 2.79 Å. The Sr(1)-N(13) bond length is 2.76 Å. The Sr(1)-N(6) bond length is 2.72 Å. The Sr(1)-O(1) bond length is 2.64 Å. The Sr(1)-O(10) bond length is 2.57 Å. The Sr(1)-O(2) bond length is 2.63 Å. The Sr(1)-O(7) bond length is 2.59 Å. The Sr(1)-O(9) bond length is 2.70 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one N(12), one N(3), one N(8), one O(11), one O(12), one O(3), one O(4), and one O(6) atom. The Sr(2)-N(12) bond length is 2.64 Å. The Sr(2)-N(3) bond length is 2.75 Å. The Sr(2)-N(8) bond length is 2.66 Å. The Sr(2)-O(11) bond length is 2.60 Å. The Sr(2)-O(12) bond length is 2.60 Å. The Sr(2)-O(3) bond length is 2.56 Å. The Sr(2)-O(4) bond length is 2.61 Å. The Sr(2)-O(6) bond length is 2.69 Å. In the third Sr site, Sr(3) is bonded in a 9-coordinate geometry to one N(2), one N(5), one N(9), one O(11), one O(12), one O(3), one O(4), one O(5), and one O(6) atom. The Sr(3)-N(2) bond length is 2.84 Å. The Sr(3)-N(5) bond length is 2.69 Å. The Sr(3)-N(9) bond length is 2.71 Å. The Sr(3)-O(11) bond length is 2.78 Å. The Sr(3)-O(12) bond length is 2.72 Å. The Sr(3)-O(3) bond length is 2.72 Å. The Sr(3)-O(4) bond length is 2.54 Å. The Sr(3)-O(5) bond length is 2.75 Å. The Sr(3)-O(6) bond length is 2.67 Å. In the fourth Sr site, Sr(4) is bonded in a 8-coordinate geometry to one N(4), one N(7), one O(1), one O(10), one O(2), one O(7), one O(8), and one O(9) atom. The Sr(4)-N(4) bond length is 2.71 Å. The Sr(4)-N(7) bond length is 2.91 Å. The Sr(4)-O(1) bond length is 2.57 Å. The Sr(4)-O(10) bond length is 2.68 Å. The Sr(4)-O(2) bond length is 2.68 Å. The Sr(4)-O(7) bond length is 2.70 Å. The Sr(4)-O(8) bond length is 2.63 Å. The Sr(4)-O(9) bond length is 2.64 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one N(1) and one N(4) atom. The C(1)-N(1) bond length is 1.34 Å. The C(1)-N(4) bond length is 1.32 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.25 Å. The C(2)-O(2) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one N(5) and one N(8) atom. The C(3)-N(5) bond length is 1.32 Å. The C(3)-N(8) bond length is 1.34 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(4)-O(3) bond length is 1.25 Å. The C(4)-O(4) bond length is 1.27 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(6), one N(12), and one N(9) atom. The C(5)-C(6) bond length is 1.49 Å. The C(5)-N(12) bond length is 1.32 Å. The C(5)-N(9) bond length is 1.33 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(6)-O(5) bond length is 1.24 Å. The C(6)-O(6) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a 2-coordinate geometry to one N(13) and one N(16) atom. The C(7)-N(13) bond length is 1.31 Å. The C(7)-N(16) bond length is 1.31 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(8)-O(7) bond length is 1.25 Å. The C(8)-O(8) bond length is 1.25 Å. There are sixteen inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one Sr(1), one C(1), and one N(2) atom. The N(1)-N(2) bond length is 1.34 Å. In the second N site, N(2) is bonded in a trigonal planar geometry to one Sr(3), one N(1), and one N(3) atom. The N(2)-N(3) bond length is 1.34 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one Sr(2), one N(2), and one N(4) atom. The N(3)-N(4) bond length is 1.34 Å. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one Sr(4), one C(1), and one N(3) atom. In the fifth N site, N(5) is bonded in a 3-coordinate geometry to one Sr(3), one C(3), and one N(6) atom. The N(5)-N(6) bond length is 1.36 Å. In the sixth N site, N(6) is bonded in a trigonal planar geometry to one Sr(1), one N(5), and one N(7) atom. The N(6)-N(7) bond length is 1.32 Å. In the seventh N site, N(7) is bonded in a distorted trigonal planar geometry to one Sr(4), one N(6), and one N(8) atom. The N(7)-N(8) bond length is 1.33 Å. In the eighth N site, N(8) is bonded in a 3-coordinate geometry to one Sr(2), one C(3), and one N(7) atom. In the ninth N site, N(9) is bonded in a 3-coordinate geometry to one Sr(3), one C(5), and one N(10) atom. The N(9)-N(10) bond length is 1.34 Å. In the tenth N site, N(10) is bonded in a trigonal planar geometry to one Sr(1), one N(11), and one N(9) atom. The N(10)-N(11) bond length is 1.31 Å. In the eleventh N site, N(11) is bonded in a water-like geometry to one N(10) and one N(12) atom. The N(11)-N(12) bond length is 1.35 Å. In the twelfth N site, N(12) is bonded in a 3-coordinate geometry to one Sr(2), one C(5), and one N(11) atom. In the thirteenth N site, N(13) is bonded in a distorted single-bond geometry to one Sr(1), one C(7), and one N(14) atom. The N(13)-N(14) bond length is 1.35 Å. In the fourteenth N site, N(14) is bonded in a water-like geometry to one N(13) and one N(15) atom. The N(14)-N(15) bond length is 1.31 Å. In the fifteenth N site, N(15) is bonded in a water-like geometry to one N(14) and one N(16) atom. The N(15)-N(16) bond length is 1.34 Å. In the sixteenth N site, N(16) is bonded in a distorted single-bond geometry to one C(7) and one N(15) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. The H(1)-O(9) bond length is 0.89 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. The H(2)-O(9) bond length is 0.72 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(10) atom. The H(3)-O(10) bond length is 0.82 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(10) atom. The H(4)-O(10) bond length is 1.13 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(11) atom. The H(5)-O(11) bond length is 0.96 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(11) atom. The H(6)-O(11) bond length is 0.67 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(12) atom. The H(7)-O(12) bond length is 0.93 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(12) atom. The H(8)-O(12) bond length is 0.77 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), and one C(2) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(4), and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one C(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sr(2), one Sr(3), and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(3) and one C(6) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), and one C(6) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(4), and one C(8) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Sr(4) and one C(8) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Sr(1), one Sr(4), one H(1), and one H(2) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Sr(1), one Sr(4), one H(3), and one H(4) atom. In the eleventh O site, O(11) is bonded in a distorted water-like geometry to one Sr(2), one Sr(3), one H(5), and one H(6) atom. In the twelfth O site, O(12) is bonded in a distorted water-like geometry to one Sr(2), one Sr(3), one H(7), and one H(8) atom. Linkers: 8 [O]C(=O)C1=NN=N[N]1 ,4 [O]C(=O)C1=N[N]N=N1. Metal clusters: 16 [Sr]. The MOF has largest included sphere 3.95 A, density 2.01 g/cm3, surface area 2506.43 m2/g, accessible volume 0.12 cm3/g