Selective Precipitation of Alkaline Earth Metal Cations with Dipicrylamine Anion: Structure–Selectivity Correlation

Crystal structure of the high-energy-density material guanylurea dipicryl-amide

The title compound, 1-carbamoylguanidinium bis-(2,4,6-tri-nitro-phen-yl)amide [H2NC(=O)NHC(NH2)2](+)[N{C6H2(NO2)3-2,4,6}2](-) (= guanylurea dipicryl-amide), was prepared as dark-red block-like crystals in 70% yield by salt-metathesis reaction between guanylurea sulfate and sodium dipicryl-amide. In the solid state, the new compound builds up an array of mutually linked guanylurea cations and dipicryl-amide anions. The crystal packing is dominated by an extensive network of N-H⋯O hydrogen bonds, resulting in a high density of 1.795 Mg m(-3), which makes the title compound a potential secondary explosive.

Explosive Werner-type cobalt(iii) complexes

A series of potentially explosive Werner-type cobalt(iii) complexes comprising the anions azotetrazolate, nitrotetrazolate, picrate and dipicrylamide have been prepared via simple metathetical routes. Representative studies of the energetic properties (impact and friction sensitivity, combustion) revealed that some of the new compounds are primary explosives.

Dipicrylamine as a colorimetric sensor for anions: experimental and computational study

Dipicrylamine exhibited colorimetric sensing of F⁻, OAc⁻ and H₂PO₄⁻, detectable by bared-eye, out of a large number of anions. Interestingly, F⁻ binds with one of the phenyl carbon of dipicrylamine.

X-ray crystallographic, FT-IR, and density functional theory studies of the salt formed between dipicrylamine and 1,5,7-triazabicyclo[4.4.0]dec-1-ene

The DPA-TBD (dipicrylamine-1,5,7-triazabicyclo[4.4.0]dec-1-ene) salt has been synthesized and characterized by FT-IR spectroscopy, X-ray single-crystal diffraction, and theoretical study. In the FT-IR spectrum of the crystalline DPA-TBD salt, an unexpected intense band at 1742 cm(-1) is present. The optimized geometry and the FT-IR spectra of the DPA salt were calculated at the B3LYP/6-31G+(d) level and give an explanation of the nature of this band as the ν(C═N═C) vibration. For comparison, the calculated IR spectra of the DPA anion, hydrogen-bonded DPA anion, and neutral DPA and TBD molecules as well as for the TBD cation are also shown. The presence of the free DPA anion in the gas phase was directly detected in the negative ion mode electrospray ionization MS spectra. The fragmentation of the DPA anion is also discussed.