AgC4N3 crystallizes in the tetragonal P4_2/mmc space group. There are two inequivalent Ag sites. In the first Ag site, Ag(1) is bonded in a tetrahedral geometry to four equivalent N(1) atoms. All Ag(1)-N(1) bond lengths are 2.31 Å. In the second Ag site, Ag(2) is bonded in a linear geometry to two equivalent N(2) atoms. Both Ag(2)-N(2) bond lengths are 2.06 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 3-coordinate geometry to one C(2), one N(1), and one N(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-N(1) bond length is 1.33 Å. The C(1)-N(2) bond length is 1.34 Å. In the second C site, C(2) is bonded in a single-bond geometry to one C(1) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Ag(1), one C(1), and one N(1) atom. The N(1)-N(1) bond length is 1.39 Å. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Ag(2) and two equivalent C(1) atoms. Linkers: 1 [C]C1=[N]=C(N=N1)[C] ,3 [C]C1=NC([C])=N[N]1. Metal clusters: 4 [Ag]. The MOF has largest included sphere 9.25 A, density 1.08 g/cm3, surface area 3389.40 m2/g, accessible volume 0.61 cm3/g