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1.  Carbamo­yl(di­amino­methyl­idene)aza­nium 3-nitro-5-oxo-4,5-di­hydro-1H-1,2,4-triazol-4-ide 
In the anion of the title salt, C2H7N4O+·C2HN4O3 −, the negative charge resides formally on the N3 atom of the triazole ring. In the crystal, the N3 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.
doi:10.1107/S1600536813015699
PMCID: PMC3770364  PMID: 24046649
2.  2-tert-Butyl-1-(4-nitro­amino-1,2,5-oxadiazol-3-yl)diazene 1-oxide 
In the title compound, C6H10N6O4, the nitro­amine –NHNO2 substituent and the C–N=N(→ O) unit of the other substituent of the oxadiazole ring are nearly coplanar with the five-membered ring [dihedral angles = 5.7 (1) and 3.0 (1)°]. The amino group of the –NHNO2 substituent is a hydrogen-bond donor to the two-coordinate N atom of the C—N=N(→ O) unit.
doi:10.1107/S1600536812027353
PMCID: PMC3393977  PMID: 22798842
3.  4-[4-(4-Amino-1,2,5-oxadiazol-3-yl)-1,2,5-oxadiazol-3-yl]-1,2,5-oxadiazol-3-amine 
The complete molecule of the compound, C6H4N8O3, is generated by a crystallographic twofold rotation axis that runs through the central ring. The flanking ring is twisted by 20.2 (1)° with respect to the central ring. One of the amino H atoms forms an intra­molecular N—H⋯N hydrogen bond; adjacent mol­ecules are linked by N—H⋯N hydrogen bonds forming a chain running along [10-2].
doi:10.1107/S1600536812017825
PMCID: PMC3344668  PMID: 22590430
4.  4,9,12,15-Tetra­oxa-3,5,8,10,14,16-hexa­aza­tetra­cyclo­[11.3.0.02,6.07,11]hexa­deca-1(16),2,5,7,10,13-hexaen-3-ium-3-olate monohydrate 
The organic mol­ecule in the title monohydrate, C6N6O5·H2O, presents an almost planar configuration, the greatest deviation from the least-squares plane through the atoms being 0.061 (1) Å for the O atom within the seven-membered ring. Each water H atom is bifurcated, one forming two O—H⋯N hydrogen bonds and the other forming O—H⋯N,O hydrogen bonds. The result of the hydrogen bonding is the formation of supra­molecular layers with a zigzag topology that stack along [001].
doi:10.1107/S160053681200774X
PMCID: PMC3297919  PMID: 22412722
5.  Diethyl 2,2′-bis­(hy­droxy­imino)-3,3′-(hydrazinediyl­idene)dibutano­ate 
Each mol­ecule of the title compound, C12H18N4O6, is located on an inversion centre at the mid-point of the central N—N bond. The azo groups C=N of the Schiff base group have an E conformation and the azo groups in the oxime C=N—O groups have a Z conformation. O–H⋯O hydrogen bonds link neighbouring mol­ecules into infinite monolayers perpendicular to the a axis.
doi:10.1107/S1600536812007398
PMCID: PMC3297900  PMID: 22412703

Results 1-5 (5)