title: Carbamo-yl(di-amino-methyl-idene)aza-nium 3-nitro-5-oxo-4,5-di-hydro-1H-1,2,4-triazol-4-ide.
abstract: In the anion of the title salt, C2H7N4O(+)·C2HN4O3 (-), the negative charge resides formally on the N(3) atom of the triazole ring. In the crystal, the N(3) and exocyclic O atoms are hydrogen-bond acceptors with respect to the formally double-bond iminium and amido N atoms of the cation. The cation and anion are almost planar (r.m.s. deviations = 0.012 and 0.051 Å, respectively), but they are slightly bent with respect to each other [dihedral angle = 12.6 (1)°]. In the crystal, adjacent anions and cations are linked by extensive N-H⋯N and N-H⋯O hydrogen bonds, generating a ribbon running along the b-axis direction.
authors.affiliation: Xi'an Modern Chemistry Research Institute, Xi'an 710065, People's Republic of China.
authors.forename: Xin-Ping
authors.initials: XP
authors.lastname: Huang
authors.forename: Bo-Zhou
authors.initials: BZ
authors.lastname: Wang
authors.forename: Dong-Ping
authors.initials: DP
authors.lastname: Li
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677