Synthesis And Performance Study Of Energetic Compounds Based On 1H,1'H-5,5'-Bitetrazole-1,1'-diol

Bitetrazole compounds have been widely investigated for civilian and military applications moiety because it possess highly positive formation enthalpy,exhibits extensive hydrogen bonding,and decomposes to produce a high percentage of dinitrogen.A further improvement of the energetic character of tetrazole-containing compounds was demonstrated by the introduction of N-oxides,in that the density is increased by further possibilities to form hydrogen bonds in the solid state,and also the oxygen content of the molecule is better balanced.The 1H,1'H-5,5'-bitetrazole-1,1'-diol?BTO?energetic anion is a very promising candidate that fulfils a variety of the aforementioned desirable properties.On the one hand,although triazolium,imidazolium,pyrazolium and dicyandiamidine cations are important nitrogen-rich cations used to construct high-performance energetic materials,related energetic salts containing BTO anion and these cations are less literature reports.On the other hand,BTO could be selectively coordinated to central ions because of containing more than 10 potential coordination N and O atoms.Whereas related energetic coordination polymer containing BTO ligands are less well-developed.Herein,this study focused on the synthesis of eleven kinds of BTO energetic salts containing these cations and an energetic coordination polymer.Besides,the thermal stability,donation performance and impact sensitivity of these energetic compounds were further investigated to screen out the energetic compounds with good performance.The main contents are the following two parts:?1?Eleven kinds of new type of BTO energetic salts were synthesized successfully and fully characterized.Seven of them were further confirmed by single crystal X-ray diffraction.All the energetic salts exhibit good thermal stabilities with decomposition temperatures?Td?ranging from 192.2 to 314.0 ?,and excellent impact sensitivities?IS?of > 40 J.Moreover,the detonation pressures?P?and velocities?D?of these energetic salts were calculated by using the empirical Kamlet-Jacobs?K-J?equations to be between 19.76?11? 28.69 GPa?12?and 6820?11? 8267?12?m·s-1,respectively.Among them,energetic salt 4 possesses the best comprehensive properties among the series salts?Td=243.0 ?,P=28.69 GPa,D=8218 m·s-1,and IS>50 J?.?2?A novel energetic coordination polymer,[Pb?BTO??H₂O?]n,was synthesized successfully and characterized by single crystal X-ray diffraction.The thermal stability and energetic properties were determined,exhibiting that good thermostability?Td=309.0 ??,excellent detonation performances(P=53.06 GPa,and D=9.204 m·s^-1),and acceptable impact sensitivity?IS=7.5 J?.Moreover,the compound as additive has a better catalytic effect on the decomposition temperature of ammonium perchlorate?AP?,exhibiting that the high-temperature decomposition temperature of AP was decreased by 40.0 ?,and large accelerating the decomposition of AP.