Green Pyrotechnic Formulations Based on Metal-Free and Nitrogen-Rich Tetrazolylborate Salts

Thomas M. Klapötke, Magdalena Rusan and Jörg Stierstorfer

Abstract: The investigation of green-burning boron-based compounds as colorants in pyrotechnic formulations as an alternative for environmentally and health hazardous barium nitrate is reported here. Metal-free and nitrogen-rich dihydrobis(5-aminotetrazolyl)borate salts and dihydrobis(1,3,4-triazolyl)borate salts have been synthesized and characterized by NMR spectroscopy, elemental analysis, mass spectrometry and vibrational spectroscopy. The energetic and thermal properties have been determined as well. Crystal structures of compounds 5b, 7 and 13 were obtained. Pyrotechnic compositions have been prepared using selected dihydrobis(azolyl)borate salts as green colorants. In these compositions ammonium dinitramide and ammonium nitrate haven been used as oxidizers, and boron and magnesium as fuels. The burn time, dominant wavelength, spectral purity, luminous intensity and luminous efficiency as well as the thermal and energetic properties of these compositions were measured.

Ref: JPyro, Issue 33, 2014, pp24-38 (J33-24)

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