CsC11N4H2OC3H2Br crystallizes in the monoclinic P2_1/c space group. The structure consists of four 2-bromopropene molecules inside a CsC11N4H2O framework. In the CsC11N4H2O framework, Cs(1) is bonded in a 8-coordinate geometry to one N(1), one N(3), two equivalent N(2), three equivalent N(4), and one O(1) atom. The Cs(1)-N(1) bond length is 3.28 Å. The Cs(1)-N(3) bond length is 3.25 Å. There is one shorter (3.21 Å) and one longer (3.31 Å) Cs(1)-N(2) bond length. There are a spread of Cs(1)-N(4) bond distances ranging from 3.25-3.66 Å. The Cs(1)-O(1) bond length is 3.51 Å. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(8), and one O(1) atom. The C(1)-C(2) bond length is 1.47 Å. The C(1)-C(8) bond length is 1.52 Å. The C(1)-O(1) bond length is 1.23 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(7) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(7) bond length is 1.41 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(7) is bonded in a distorted single-bond geometry to one C(2) and one H(4) atom. The C(7)-H(4) bond length is 1.09 Å. In the fifth C site, C(8) is bonded in a trigonal planar geometry to one C(1), one C(12), and one C(9) atom. The C(8)-C(12) bond length is 1.41 Å. The C(8)-C(9) bond length is 1.40 Å. In the sixth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(11), and one C(8) atom. The C(9)-C(10) bond length is 1.41 Å. The C(9)-C(11) bond length is 1.42 Å. In the seventh C site, C(10) is bonded in a distorted linear geometry to one C(9) and one N(1) atom. The C(10)-N(1) bond length is 1.17 Å. In the eighth C site, C(11) is bonded in a distorted linear geometry to one C(9) and one N(2) atom. The C(11)-N(2) bond length is 1.17 Å. In the ninth C site, C(12) is bonded in a trigonal planar geometry to one C(13), one C(14), and one C(8) atom. The C(12)-C(13) bond length is 1.41 Å. The C(12)-C(14) bond length is 1.41 Å. In the tenth C site, C(13) is bonded in a distorted linear geometry to one C(12) and one N(3) atom. The C(13)-N(3) bond length is 1.17 Å. In the eleventh C site, C(14) is bonded in a distorted single-bond geometry to one C(12) and one N(4) atom. The C(14)-N(4) bond length is 1.17 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a single-bond geometry to one Cs(1) and one C(10) atom. In the second N site, N(2) is bonded in a distorted single-bond geometry to two equivalent Cs(1) and one C(11) atom. In the third N site, N(3) is bonded in a distorted single-bond geometry to one Cs(1) and one C(13) atom. In the fourth N site, N(4) is bonded in a distorted single-bond geometry to three equivalent Cs(1) and one C(14) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(7) atom. O(1) is bonded in a single-bond geometry to one Cs(1) and one C(1) atom. Linkers: 4 N#C[C](C#N)C(C(=O)c1ccc(Br)cc1)=C(C#N)C#N. Metal clusters: 4 [Cs]. The MOF has largest included sphere 2.33 A, density 1.97 g/cm3, surface area 3862.87 m2/g, accessible volume 0.09 cm3/g