EuC17H12O4 crystallizes in the orthorhombic Pnna space group. Eu(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Eu(1)-O(1) bond lengths are 2.34 Å. Both Eu(1)-O(2) bond lengths are 2.30 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.52 Å. The C(1)-O(1) bond length is 1.22 Å. The C(1)-O(2) bond length is 1.20 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(4) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(4) bond length is 1.38 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(7), and one H(1) atom. The C(3)-C(7) bond length is 1.38 Å. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2) and one H(2) atom. The C(4)-H(2) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(6) and one H(3) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-H(3) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(6), and one C(7) atom. The C(6)-C(6) bond length is 1.47 Å. The C(6)-C(7) bond length is 1.33 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(3), one C(6), and one C(9) atom. The C(7)-C(9) bond length is 1.55 Å. In the eighth C site, C(8) is bonded in a trigonal non-coplanar geometry to one C(9), one H(4), one H(5), and one H(6) atom. The C(8)-C(9) bond length is 1.52 Å. The C(8)-H(4) bond length is 0.96 Å. The C(8)-H(5) bond length is 0.96 Å. The C(8)-H(6) bond length is 0.96 Å. In the ninth C site, C(9) is bonded in a tetrahedral geometry to two equivalent C(7) and two equivalent C(8) atoms. There are six 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(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) 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(8) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(8) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a linear geometry to one Eu(1) and one C(1) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(1) atom. Linkers: 4 CC1(C)c2cc(C([O])=O)ccc2-c2ccc(C([O])=O)cc21. Metal clusters: 4 [Eu]. RCSR code: pts. The MOF has largest included sphere 6.09 A, density 1.08 g/cm3, surface area 3742.64 m2/g, accessible volume 0.49 cm3/g