Abstract
The focus of energetic materials is on searching for a high-energy, high-density, insensitive material. Previous investigations have shown that 3D energetic metal–organic frameworks (E-MOFs) have great potential and advantages in this field. A nitrogen-rich E-MOF, Pb(bta)·2H2O [N% = 31.98%, H2bta = N,N-Bis(1H-tetrazole-5-yl)-amine], was prepared through a one-step hydrothermal reaction in this study. Its crystal structure was determined through single-crystal X-ray diffraction, Fourier transform infrared spectroscopy, and elemental analysis. The complex has high heat denotation (16.142 kJ·cm−3), high density (3.250 g·cm−3), and good thermostability (Tdec = 614.9 K, 5 K·min−1). The detonation pressure and velocity obtained through theoretical calculations were 43.47 GPa and 8.963 km·s−1, respectively. The sensitivity test showed that the complex is an impact-insensitive material (IS > 40 J). The thermal decomposition process and kinetic parameters of the complex were also investigated through thermogravimetry and differential scanning calorimetry. Non-isothermal kinetic parameters were calculated through the methods of Kissinger and Ozawa-Doyle. Results highlighted the nitrogen-rich MOF as a potential energetic material.
Highlights
We successfully synthesized a nitrogen-rich energetic metal–organic frameworks (E-MOFs), namely, Pb(bta) ̈2H2 O [N% = 31.98%, H2 bta = N,N-Bis(1H-tetrazole-5-yl)-amine]. It was characterized through various techniques, such as elemental analyses, Fourier transform infrared spectroscopy, TG, differential scanning calorimetry (DSC), and single crystal X-ray diffraction
X-ray single crystal structure analysis showed that the crystal of the complex in the monoclinic space group P21 /n has a calculated density of 3.250 gcm3
The DSC curve indicated that it has good thermostability
Summary
Metal-organic frameworks (MOFs) have elicited much interest in chemistry, material science, medicine, and environmental science [1,2,3,4,5,6,7,8,9] because of their stable architectures, controllable structures, modifiable properties, and potential applications in gas storage [10,11,12,13], chemical separation [14,15,16,17], catalysis [18,19,20,21], chemical sensor technology [5], drug delivery [22,23,24], and so on. MOFs consist of metal ions (Pb2+ , Ag+ , etc.), energetic anions (e.g., N3 ́ and NO3 ́ ), or simple energetic ligands (triazole, tetrazole, tetrazine, hydrazine, etc.). The network structures of energetic MOFs (E-MOFs) can be designed as 1D, 2D, or 3D architectures (Figure 1) depending on the metal ion geometry and binding mode of the bridging energetic ligands.
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