Preparation of energetic poly(azolyl)borates as new environmentally benign green-light-emitting species for pyrotechnics

摘要

Three different energetic poly(azolyl)borates, potassium dihydridobis(4-nitroimidazolyl)borate, sodium dihydridobis(4, 5-dinitroimidazolyl)borate, and sodium dihydridobis(3, 4,5-trinitropyrazolyl) borate, were synthesized as starting materials for metal-free environmentally benign green-light-emitting substitutes for barium salts in pyrotechnical mixtures. The compounds were analyzed by NMR and Raman spectroscopy and high mass resolution spectrometry. Moreover, the energetic properties regarding physical and thermal stability were determined. The 11B NMR chemical shifts were calculated and compared to the experimental values and intense investigations on the formation of poly(4-nitroimidazolyl)borates were performed. Furthermore, the solvolytic stability towards alcohol and water was tested.