title: 5-Amino-3-(4H-1,2,4-triazol-4-yl)-1H-1,2,4-triazole.
abstract: The asymmetric unit of the title compound, C(4)H(5)N(7), comprises two independent but virtually superimposable mol-ecules. Each mol-ecule is planar with the dihedral angles between the five-membered rings being 2.8 (3) and 2.1 (3)°. The crystal structure is formed by an extensive network of relatively strong N-H⋯N hydrogen-bond inter-actions. Individual mol-ecules are arranged into supra-molecular zigzag chains running parallel to [001] by way of the strongest N-H⋯N inter-actions. Adjacent chains are inter-connected by rather long (D⋯A distances range from ca 3.00 to 3.03 Å) but highly directional (inter-action angles above ca 173°) hydrogen bonds forming a supra-molecular layer in the bc plane.
authors.forename: Bing
authors.initials: B
authors.lastname: Liu
authors.forename: João P C
authors.initials: JP
authors.lastname: Tomé
authors.forename: Luís
authors.initials: L
authors.lastname: Cunha-Silva
authors.forename: Filipe A
authors.initials: FA
authors.lastname: Almeida Paz