Synthesis of Bridged Tetrazoles with Promising Properties and Potential Applications by a One-Step Finkelstein Reaction

Numerous nitramine bridged compounds which show promising combinations of properties have already been identified in the area of energetic materials. In this work, four new nitrazapropane bridged tetrazoles, as well as four new trinitrazaheptane tetrazoles and three oxapropane bridged tetrazoles were synthesized and fully characterized. These new compounds can all be synthesized by a simple, one-step synthesis using Finkelstein conditions. All of these new energetic materials were characterized using NMR spectroscopy, single crystal X-ray diffraction, vibrational analysis and elemental analysis. The thermal behaviour of these compounds was studied by differential thermal analysis (DTA) and partly by thermogravimetric analysis (TGA). The BAM standard method was used to determine the sensitivities towards impact (IS) and friction (FS). The enthalpies of formation were calculated at the CBS-4M level, and the energetic performances were calculated using the EXPLO5 (V6.06.01) computer code. The properties of the new compounds were compared to each other as well as to the known energetic material RDX. Moreover, the iron(II) and copper(II) perchlorate complexes with 1,3-bis-1,1-tetrazolylnitrazapropane as ligand were prepared and investigated. Several new nitramine- and oxa-bridged bis-tetrazolyl energetic materials were synthesized and fully characterized. The thermal behavior of all compounds was studied and their sensitivities towards impact (IS) and friction (FS) determined. Energetic properties, were calculated using the EXPLO5 (V6.06.01) computer code. In particular, 1,3-bis-2,2'-nitrotetrazolylnitrazapropane and 1,7-bis-2,2'-tetrazolyltrinitrazaheptane show promising properties for use as RDX replacements.image

Automated summary

Numerous nitramine bridged compounds with promising properties have been identified in the field of energetic materials. This study synthesized and characterized several new energetic materials and compared their properties to the traditional material RDX. The thermal behavior and sensitivities of these compounds were also investigated.