EuH15(C11O2)3 crystallizes in the trigonal R32 space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(3), and four equivalent O(2) atoms. Both Eu(1)-O(1) bond lengths are 2.52 Å. Both Eu(1)-O(3) bond lengths are 2.47 Å. There are two shorter (2.65 Å) and two longer (2.97 Å) Eu(1)-O(2) bond lengths. There are twenty inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(15), one C(2), and one H(1) atom. The C(1)-C(15) bond length is 1.35 Å. The C(1)-C(2) bond length is 1.37 Å. The C(1)-H(1) bond length is 1.03 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(16), and one H(2) atom. The C(2)-C(16) bond length is 1.41 Å. The C(2)-H(2) bond length is 0.99 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(19), one C(4), and one H(3) atom. The C(3)-C(19) bond length is 1.39 Å. The C(3)-C(4) bond length is 1.35 Å. The C(3)-H(3) bond length is 0.99 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(20), one C(3), and one C(5) atom. The C(4)-C(20) bond length is 1.36 Å. The C(4)-C(5) bond length is 1.45 Å. In the fifth C site, C(5) is bonded in a linear geometry to one C(4) and one C(6) atom. The C(5)-C(6) bond length is 1.14 Å. In the sixth C site, C(6) is bonded in a linear geometry to one C(5) and one C(7) atom. The C(6)-C(7) bond length is 1.42 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(12), one C(6), and one C(8) atom. The C(7)-C(12) bond length is 1.38 Å. The C(7)-C(8) bond length is 1.38 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(7) and one H(4) atom. The C(8)-H(4) bond length is 1.01 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(10) and one H(5) atom. The C(9)-C(10) bond length is 1.38 Å. The C(9)-H(5) bond length is 1.02 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(9) atom. The C(10)-C(11) bond length is 1.38 Å. The C(10)-C(13) bond length is 1.45 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(10), one C(12), and one H(6) atom. The C(11)-C(12) bond length is 1.36 Å. The C(11)-H(6) bond length is 1.01 Å. In the twelfth C site, C(12) is bonded in a distorted trigonal planar geometry to one C(11), one C(7), and one H(7) atom. The C(12)-H(7) bond length is 1.02 Å. In the thirteenth C site, C(13) is bonded in a 2-coordinate geometry to one C(10), one O(2), and one O(3) atom. The C(13)-O(2) bond length is 1.27 Å. The C(13)-O(3) bond length is 1.21 Å. In the fourteenth C site, C(14) is bonded in a bent 120 degrees geometry to one C(15) and two equivalent O(1) atoms. The C(14)-C(15) bond length is 1.47 Å. Both C(14)-O(1) bond lengths are 1.25 Å. In the fifteenth C site, C(15) is bonded in a trigonal planar geometry to one C(14) and two equivalent C(1) atoms. In the sixteenth C site, C(16) is bonded in a trigonal planar geometry to one C(17) and two equivalent C(2) atoms. The C(16)-C(17) bond length is 1.42 Å. In the seventeenth C site, C(17) is bonded in a linear geometry to one C(16) and one C(18) atom. The C(17)-C(18) bond length is 1.16 Å. In the eighteenth C site, C(18) is bonded in a linear geometry to one C(17) and one C(19) atom. The C(18)-C(19) bond length is 1.42 Å. In the nineteenth C site, C(19) is bonded in a trigonal planar geometry to one C(18) and two equivalent C(3) atoms. In the twentieth C site, C(20) is bonded in a distorted single-bond geometry to two equivalent C(4) and one H(8) atom. The C(20)-H(8) bond length is 1.00 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(11) 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(8) is bonded in a single-bond geometry to one C(20) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(14) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Eu(1) and one C(13) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Eu(1) and one C(13) atom. Linkers: 9 [O]C(=O)c1ccc(C#Cc2cc(C#Cc3ccc(C([O])=O)cc3)cc(C#Cc3ccc(C([O])=O)cc3)c2)cc1. Metal clusters: 9 [Eu]. The MOF has largest included sphere 15.90 A, density 0.68 g/cm3, surface area 4144.61 m2/g, accessible volume 1.13 cm3/g