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Pentazenium tetraazidoborate

Pentazenium tetraazidoborate is an extremely unstable chemical compound with the formula N5[B(N3)4]. It is a white solid that violently explodes at room temperature. This compound has a 95.7% nitrogen content which is the second highest known of a chemical compound, exceeding even that of ammonium azide (93.3%) and 1-diazidocarbamoyl-5-azidotetrazole (89.1%), being surpassed only by hydrazoic acid (97.7%).

Production and properties
The production of N5[B(N3)4] requires a multi-step synthesis, first, hydrazoic acid and sodium borohydride is reacted in diethyl ether at -78 °C to produce sodium tetraazidoborate (which decomposes at 76 °C): :NaBH4 + 4HN3 → Na[B(N3)4] + 4H2 The other reactant, pentazenium hexafluoroantimonate, its produced by the reaction of N2F+ and antimony(V) fluoride. Then, two reactants that are produced are mixed at -64 °C under sulfur dioxide: :N5[B(N3)4] → 8N2 + BN The compound is extremely sensitive, an attempted Raman spectroscopy of a 500 mg sample of the compound resulted in an explosion. ==References==
Source: Wikipedia ↗
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