Synthesis, Crystal Structure and Thermal Analysis of Two New Energetic Compounds (AIM)NO3and (AIM)(HTNR)·H2O

Abstract

Two new energetic compounds (AIM)NO3 and (AIM)(HTNR)•H2O have been prepared directly by reacting 2-azidoimidazolium with HNO3 and 2,4,6-trinitroresorcinol (TNR). Single crystals suitable for X-ray measurement were obtained. The compounds were characterized by elemental analysis, fourier transform infrared (FTIR) spectra, single crystal X-ray diffraction, differential scanning calorimetry (DSC), and thermogravimetry-differential thermogravimetry (TG-DTG) analysis. (AIM)NO3 belongs to a monoclinic system with P21/c space group and cell parameters of a=17.034(3) A, b=6.5214(13) A, c=13.095(3) A, β=111.78(3)°, V=1350.8(5) nm; Dc=1.693 g/cm. The compound is formed by AIM + and NO 3 , and belongs to an ionic compound. There are a lot of intramolecular and intermolecular hydrogen bonds existing in the compound, which makes the compound more stable. (AIM)(HTNR)•H2O belongs to a triclinic system with P1 space group and cell parameters of a=6.4900(13) A, b=7.4286(15) A, c=15.401(3) A, α= 472 化 学 学 报 Vol. 70, 2012 101.57(3)°, β=98.56(3)°, γ=99.89(3)°, V=703.6(2) A; Dc=1.757 g/cm. The compound is formed by AIM+ and HTNR-, and belongs to an ionic compound. Under nitrogen atmosphere with a heating rate of 10 °C/min, the thermal decomposition of the title compounds show that there is only one exothermic process with released gas, respectively. Sensitivities of the title compounds have been studied and the result show that (AIM)NO3 has good flame sensitivity.