CsC10P2H9O3CH crystallizes in the triclinic P-1 space group. The structure consists of four 02329_fluka molecules inside a CsC10P2H9O3 framework. In the CsC10P2H9O3 framework, there are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a 10-coordinate geometry to one H(1), one H(17), one H(4), one H(5), one O(4), one O(5), two equivalent O(1), and two equivalent O(2) atoms. The Cs(1)-H(1) bond length is 3.25 Å. The Cs(1)-H(17) bond length is 3.03 Å. The Cs(1)-H(4) bond length is 3.11 Å. The Cs(1)-H(5) bond length is 3.08 Å. The Cs(1)-O(4) bond length is 3.06 Å. The Cs(1)-O(5) bond length is 3.14 Å. There is one shorter (3.07 Å) and one longer (3.37 Å) Cs(1)-O(1) bond length. There is one shorter (3.15 Å) and one longer (3.24 Å) Cs(1)-O(2) bond length. In the second Cs site, Cs(2) is bonded in a 8-coordinate geometry to one H(17), one H(9), one O(2), one O(3), one O(4), one O(6), and two equivalent O(1) atoms. The Cs(2)-H(17) bond length is 3.05 Å. The Cs(2)-H(9) bond length is 3.23 Å. The Cs(2)-O(2) bond length is 3.08 Å. The Cs(2)-O(3) bond length is 2.99 Å. The Cs(2)-O(4) bond length is 3.05 Å. The Cs(2)-O(6) bond length is 3.17 Å. There is one shorter (3.22 Å) and one longer (3.39 Å) Cs(2)-O(1) bond length. There are twenty inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(10), one C(2), and one P(1) atom. The C(1)-C(10) bond length is 1.42 Å. The C(1)-C(2) bond length is 1.38 Å. The C(1)-P(1) bond length is 1.82 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 H(1) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to 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 single-bond geometry to one C(5) and one H(3) atom. The C(4)-C(5) bond length is 1.42 Å. The C(4)-H(3) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(10), one C(4), and one C(6) atom. The C(5)-C(10) bond length is 1.43 Å. The C(5)-C(6) bond length is 1.42 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one H(4) atom. The C(6)-H(4) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one H(5) atom. The C(7)-H(5) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(9) and one H(6) atom. The C(8)-C(9) bond length is 1.39 Å. The C(8)-H(6) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(10), one C(8), and one P(2) atom. The C(9)-C(10) bond length is 1.43 Å. The C(9)-P(2) bond length is 1.83 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(9) atom. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(12), one C(20), and one P(3) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-C(20) bond length is 1.43 Å. The C(11)-P(3) bond length is 1.84 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(11) and one H(7) atom. The C(12)-H(7) bond length is 1.09 Å. In the thirteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(15) and one H(9) atom. The C(14)-C(15) bond length is 1.42 Å. The C(14)-H(9) bond length is 1.09 Å. In the fourteenth C site, C(15) is bonded in a trigonal planar geometry to one C(14), one C(16), and one C(20) atom. The C(15)-C(16) bond length is 1.42 Å. The C(15)-C(20) bond length is 1.43 Å. In the fifteenth C site, C(16) is bonded in a distorted single-bond geometry to one C(15) and one H(10) atom. The C(16)-H(10) bond length is 1.09 Å. In the sixteenth C site, C(18) is bonded in a distorted single-bond geometry to one C(19) and one H(12) atom. The C(18)-C(19) bond length is 1.38 Å. The C(18)-H(12) bond length is 1.09 Å. In the seventeenth C site, C(19) is bonded in a trigonal planar geometry to one C(18), one C(20), and one P(4) atom. The C(19)-C(20) bond length is 1.42 Å. The C(19)-P(4) bond length is 1.81 Å. In the eighteenth C site, C(20) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(19) atom. In the nineteenth C site, C(21) is bonded in a tetrahedral geometry to one H(14), one H(15), one H(16), and one O(5) atom. The C(21)-H(14) bond length is 1.10 Å. The C(21)-H(15) bond length is 1.10 Å. The C(21)-H(16) bond length is 1.10 Å. The C(21)-O(5) bond length is 1.42 Å. In the twentieth C site, C(22) is bonded in a tetrahedral geometry to one H(18), one H(19), one H(20), and one O(6) atom. The C(22)-H(18) bond length is 1.10 Å. The C(22)-H(19) bond length is 1.10 Å. The C(22)-H(20) bond length is 1.10 Å. The C(22)-O(6) bond length is 1.43 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one O(1), and one O(2) atom. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.53 Å. In the second P site, P(2) is bonded in a distorted single-bond geometry to one C(9) atom. In the third P site, P(3) is bonded in a distorted single-bond geometry to one C(11) atom. In the fourth P site, P(4) is bonded in a distorted trigonal non-coplanar geometry to one C(19), one O(3), and one O(4) atom. The P(4)-O(3) bond length is 1.52 Å. The P(4)-O(4) bond length is 1.53 Å. There are eighteen inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one Cs(1) and one C(2) atom. 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(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one Cs(1) and one C(6) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one Cs(1) and one C(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(12) atom. In the eighth H site, H(9) is bonded in a single-bond geometry to one Cs(2) and one C(14) atom. In the ninth H site, H(10) is bonded in a single-bond geometry to one C(16) atom. In the tenth H site, H(12) is bonded in a single-bond geometry to one C(18) atom. In the eleventh H site, H(13) is bonded in a distorted single-bond geometry to one O(3) and one O(5) atom. The H(13)-O(3) bond length is 1.66 Å. The H(13)-O(5) bond length is 1.00 Å. In the twelfth H site, H(14) is bonded in a single-bond geometry to one C(21) atom. In the thirteenth H site, H(15) is bonded in a single-bond geometry to one C(21) atom. In the fourteenth H site, H(16) is bonded in a single-bond geometry to one C(21) atom. In the fifteenth H site, H(17) is bonded in a distorted single-bond geometry to one Cs(1), one Cs(2), and one O(6) atom. The H(17)-O(6) bond length is 1.00 Å. In the sixteenth H site, H(18) is bonded in a single-bond geometry to one C(22) atom. In the seventeenth H site, H(19) is bonded in a single-bond geometry to one C(22) atom. In the eighteenth H site, H(20) is bonded in a single-bond geometry to one C(22) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Cs(1), two equivalent Cs(2), and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Cs(2), two equivalent Cs(1), and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Cs(2), one P(4), and one H(13) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one Cs(1), one Cs(2), and one P(4) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Cs(1), one C(21), and one H(13) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one Cs(2), one C(22), and one H(17) atom. Linkers: 2 [O][P@]1(=O)c2cccc3cccc(c23)P1P1c2cccc3cccc(c23)[P@@]1([O])=O. Metal clusters: 4 [Cs]. The MOF has largest included sphere 1.78 A, density 2.05 g/cm3, surface area 3740.67 m2/g, accessible volume 0.11 cm3/g