On the basis of hypergolic dicyandiamide (DCA) and cyanoborohydride (CBH) anions, 1-methyl-1,2,4-triazole (MTZ) ligand, and transition metal (Co/Ni/Cu) cations, five hypergolic coordination compounds (HCCs) were synthesized and characterized. Their molecular formulas were expressed as [Co(MTZ) 4), and [Ni(MTZ) 4 ](CBH) 2 (5). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) instruments were used to investigate the thermal decomposition behaviors of compounds 1− 5, and the DSC instrument was used to investigate the catalytic effect of HCCs on the thermal decomposition of ammonium perchlorate (AP). High-temperature decomposition (HTD) of AP samples with 5% catalyst occurred immediately after lowtemperature decomposition (LTD), and their HTD temperatures were lowered by 60−116 °C. The heat release of all samples is improved observably and is 2−3 times that of pure AP. Among them, compound 1 shows the best catalytic performance. The heat release of sample AP + compound 1 can reach 2291 J g −1 , and the decomposition temperature can be advanced by 116 °C. The kinetic/thermodynamic parameters were calculated to further study the catalytic mechanism of HCCs on the thermal decomposition of AP. The research in this paper shows that HCCs were suggesting for a class of novel additives of composite propellants with improved combustion and energetic performances.

In this study, a hypergolic linker (dicyanamide, DCA) and a highenergy nitrogen-rich ligand (1,5-diaminotetrazole, DAT) were applied to construct high-energy metal−organic frameworks (HEMOFs) with hypergolic property. Three novel metal−organic frameworks (MOFs) were synthesized via a mild method with fascinating 2D polymeric architectures, and they could ignite spontaneously upon contact with white fuming nitric acid (WFNA). The gravimetric energy densities of the three HEMOFs all exceeded 26.2 kJ•g −1 . The cupric MOF exhibits the highest gravimetric and volumetric energy density of 27.5 kJ•g −1 and 51.3 kJ•cm −3 , respectively. By adjusting the metal cations, high-energy ligands and hypergolic linkers can improve the performance of hypergolic MOFs. This work provides a strategy for manufacturing MOFs as potential high-energy hypergolic fuels.

Constructing high performance hypergolic propellant is of vital importance yet challenging. Herein, by taking metal organic framework(MOF) as a propotypical system, we proposed that co-assembled functional cyanotetrazolylborohydride (CTB) and imidazole...

Ammonium perchlorate | Energetic complex | Hydrothermal synthesis | Heterogeneous catalysis | Kinetics In this study, four new energetic complexes (1) [Cu(vimi) 4 ]DCA 2 , (2) [Co(vimi) 4 ]DCA 2 , (3) [Ni(vimi) 4 ]DCA 2 , and (4) [Cu(vimi) 4 ]CBH 2 (vimi:1-vinylimidazole, DCA: dicyanamide anion, CBH: cyanoborohydride anion) were prepared, and their structures were characterized via single-crystal X-ray diffraction, elemental analysis, and Fourier-transform infrared spectroscopy. The catalytic effects of the complexes on ammonium perchlorate thermal decomposition were studied via thermal analysis methods, including differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Among the complexes, complex 2 showed the best catalytic performance. The two decomposition peaks in the DSC curve of the pure ammonium perchlorate-low-temperature decomposition (LTD) peak: 295 °C and high-temperature decomposition (HTD) peak: 418 °C-were merged into a lower decomposition peak (325 °C) in the curve of AP with complex 2. Moreover, the heat released by ammonium perchlorate with complex 2 (1661.7 J g −1 ) was significantly higher than that released by the pure ammonium perchlorate (814.5 J g −1 ). The kinetic parameters calculated using Kissinger's method revealed that the complexes had a significant effect on the activation energy of ammonium perchlorate decomposition (223.5 kJ mol −1 ), and complex 2 lowered the activation energy to 115.6 kJ mol −1 . The results indicate that complex 2 is a potential energetic additive for ammonium perchlorate-based solid propellants.

In this study, a novel high-energy metal-organic framework (MOF, [Cu(MTZ)2(CTB)2]n) was constructed based on the nitrogen-rich cyanotetrazolylborohydride (CTB) and 1-methyltriazole (MTZ) ligands, with Cu2+ as the autocatalytic metal centers. The...