Energetic nitrogen crystals

Tetrazine-based explosives are often highly energetic. The high nitrogen content of such compounds often results in high crystal density and explosive performance. 3,6-Diamino-1,2,4,5-tetrazine (198) is a starting material for the synthesis of other 1,2,4,5-tetrazines and is itself synthesized from the condensation of triaminoguanidine hydrochloride (195)... 

Azide compounds of hypervalent main group elements such as Si and Ge are also highly explosive [83,84], but their structures and energetics have not been widely explored. Quite recently, the crystal structure of the Si(N3)62 anion has been reported, which has 90% nitrogen content, enough to be a possible high-energetic material candidate[83,84]. It is noted that Si(N3)62 (E = Ge, Pb) have been synthesized and are structurally known [83],... 

In AIN crystals, transition metal PL appears at about the same energetic position as in GaN. In TABLE 1 we summarise 3d transition metal emissions identified in AIN and GaN and corresponding references. The transitions are listed in the last column. It seems that 3d transition metals detected in GaN are generally detected in AIN at nearly the same energetic position. This indicates that the bonding between the four nitrogen ligands and the 3d transition metals in GaN and AIN is very similar. 

Phenylhydrazine as a reducing agent. Walther, at Dresden in 1895-96, ° observed by chance that phenylhydrazine reacts energetically with azobenzene at an elevated temperature. He heated a mixture of 0.1 mole of each reactant in abathat 125-130° and noted that evolution of nitrogen continued for about 1 hr. and then ceased. Crystallization of the residual material from an equal volume of absolute ethanol afforded white plates of pure hydrazobenzene in nearly quantitative yield. Nitrogen evolved amounted to 2.7 g. the amount expected for the following reaction is 2.8 g. ... 

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