EuC12H3(NO2)3 crystallizes in the triclinic P-1 space group. Eu(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. The Eu(1)-O(1) bond length is 2.45 Å. The Eu(1)-O(2) bond length is 2.50 Å. The Eu(1)-O(3) bond length is 2.43 Å. The Eu(1)-O(5) bond length is 2.36 Å. The Eu(1)-O(6) bond length is 2.37 Å. There is one shorter (2.34 Å) and one longer (2.69 Å) Eu(1)-O(4) bond length. There are twelve 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 1.24 Å. The C(1)-O(2) bond length is 1.25 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 1.35 Å. The C(2)-C(4) bond length is 1.34 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.42 Å. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(2), one C(3), and one N(1) atom. The C(4)-N(1) bond length is 1.45 Å. In the fifth C site, C(5) is bonded in a bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(5)-C(6) bond length is 1.52 Å. The C(5)-O(3) bond length is 1.24 Å. The C(5)-O(4) bond length is 1.26 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.37 Å. The C(6)-C(8) bond length is 1.34 Å. In the seventh C site, C(7) is bonded in a distorted trigonal planar geometry to one C(6), one C(8), and one N(2) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-N(2) bond length is 1.45 Å. In the eighth C site, C(8) is bonded in a single-bond geometry to one C(6), one C(7), and one H(2) atom. The C(8)-H(2) bond length is 0.93 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(5), and one O(6) atom. The C(9)-C(10) bond length is 1.48 Å. The C(9)-O(5) bond length is 1.26 Å. The C(9)-O(6) bond length is 1.26 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11), one C(12), and one C(9) atom. The C(10)-C(11) bond length is 1.36 Å. The C(10)-C(12) bond length is 1.40 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(3) atom. The C(11)-C(12) bond length is 1.38 Å. The C(11)-H(3) bond length is 0.93 Å. In the twelfth C site, C(12) is bonded in a distorted trigonal planar geometry to one C(10), one C(11), and one N(3) atom. The C(12)-N(3) bond length is 1.45 Å. There are three inequivalent N sites. In the first N site, N(1) is bonded in a single-bond geometry to one C(4) atom. In the second N site, N(2) is bonded in a single-bond geometry to one C(7) atom. In the third N site, N(3) is bonded in a single-bond geometry to one C(12) atom. There are three 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(8) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(11) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to one Eu(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one Eu(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted water-like geometry to one Eu(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one C(5) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Eu(1) and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Eu(1) and one C(9) atom. Linkers: 3 [N]c1cc(C([O])=O)c([N])cc1C([O])=O. Metal clusters: 1 [C]1O[Eu]234(O1)O[C]O[Eu]1(O[C]O1)(O[C]O2)(O[C]O3)O[C]O4. RCSR code: pcu. The MOF has largest included sphere 5.60 A, density 1.09 g/cm3, surface area 2990.86 m2/g, accessible volume 0.64 cm3/g