FeAu2H4(C4N3)2(C4NH2)2 crystallizes in the trigonal R-3m space group. The structure consists of six C4NH2 clusters inside a FeAu2H4(C4N3)2 framework. In each C4NH2 cluster, there are three inequivalent C sites. In the first C site, C(2) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(2)-C(4) bond length is 1.38 Å. The C(2)-H(2) bond length is 0.93 Å. In the second C site, C(4) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(2) atoms. The C(4)-C(5) bond length is 1.47 Å. In the third C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4) and two equivalent N(2) atoms. Both C(5)-N(2) bond lengths are 1.36 Å. N(2) is bonded in a bent 120 degrees geometry to two equivalent C(5) atoms. H(2) is bonded in a single-bond geometry to one C(2) atom. In the FeAu2H4(C4N3)2 framework, Fe(1) is bonded in an octahedral geometry to two equivalent N(3) and four equivalent N(1) atoms. Both Fe(1)-N(3) bond lengths are 2.17 Å. All Fe(1)-N(1) bond lengths are 2.18 Å. Au(1) is bonded in a linear geometry to two equivalent C(3) atoms. Both Au(1)-C(3) bond lengths are 2.00 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one N(3) and one H(1) atom. The C(1)-N(3) bond length is 1.34 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(3) is bonded in a distorted single-bond geometry to one Au(1) and one N(1) atom. The C(3)-N(1) bond length is 1.11 Å. There are two inequivalent N sites. In the first N site, N(3) is bonded in a trigonal planar geometry to one Fe(1) and two equivalent C(1) atoms. In the second N site, N(1) is bonded in a linear geometry to one Fe(1) and one C(3) atom. H(1) is bonded in a single-bond geometry to one C(1) atom. Linkers: 6 n1ccc(cc1)C1=NC(=[N]=C([N]1)c1ccncc1)c1ccncc1. Metal clusters: 9 [Fe] ,18 [Au]. The MOF has largest included sphere 4.94 A, density 1.84 g/cm3, surface area 2699.47 m2/g, accessible volume 0.31 cm3/g