Ru6FeC18H12(NO4)6 crystallizes in the trigonal R-3m space group. Ru(1) is bonded in a distorted square pyramidal geometry to one N(1), one O(1), one O(2), and two equivalent O(3) atoms. The Ru(1)-N(1) bond length is 2.13 Å. The Ru(1)-O(1) bond length is 2.04 Å. The Ru(1)-O(2) bond length is 2.04 Å. Both Ru(1)-O(3) bond lengths are 2.04 Å. Fe(1) is bonded in an octahedral geometry to six equivalent C(3) atoms. All Fe(1)-C(3) bond lengths are 1.86 Å. There are two inequivalent C sites. In the first C site, C(3) is bonded in a linear geometry to one Fe(1) and one N(1) atom. The C(3)-N(1) bond length is 1.18 Å. In the second C site, C(1,2) is bonded in a trigonal planar geometry to one H(1,2); one O(1); and one O(2) atom. The C(1,2)-H(1,2) bond length is 1.10 Å. The C(1,2)-O(1) bond length is 1.28 Å. The C(1,2)-O(2) bond length is 1.28 Å. N(1) is bonded in a linear geometry to one Ru(1) and one C(3) atom. H(1,2) is bonded in a single-bond geometry to one C(1,2) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(1,2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(1,2) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Ru(1) and one C(1,2) atom. The O(3)-C(1,2) bond length is 1.28 Å. Linkers: 12 [O]C=O ,6 [C]#N. Metal clusters: 1 [Fe] ,6 [Ru]. The MOF has largest included sphere 3.31 A, density 2.23 g/cm3, surface area 3033.71 m2/g, accessible volume 0.13 cm3/g