New form of high energy primary explosive: Dual structure composed of ionic salt-based coordination polymers

et al. 2023

J. Phys. Chem. C

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In addition to the three classical methods for adjusting the performance of energetic complexes, in order to explore the influence of different bonding types on the performance of energetic materials, we designed ionic salts PZCA•HClO 4 (3) and ECPs [Ag(PZCA)ClO 4 ] n (4) with PZCA(1H-pyrazole-4carbohydrazide) as the ligand. They use the same ligands and oxidizing acids and also have the same N/O number. On the basis of their structures and compositions confirmed by infrared spectroscopy, elemental analysis, and single-crystal X-ray diffraction, the characterization of physical and chemical properties shows that 4 has better thermal decomposition behavior (ΔT = 30 °C), more suitable mechanical sensitivity (IS = 5 J, FS = 9 N), and more outstanding initiation performance. After studying the decomposition mechanism, we find that different types of bonds (H bond or coordination covalent bond) lead to different decomposition mechanisms (redox reaction or free radical reaction) and, finally, show great differences in explosive properties.

Section: Introductionmentioning

confidence: 99%

Keeping the Same Ratio of the Ligand and Perchlorate: Realizing the High Performance of Energetic Materials by Changing the Bonding Mode

Zhang

et al. 2023

J. Phys. Chem. C

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“…For example, the introduction of bis-1,2,4-triazoles and bis-1,2,4-oxadiazole bridges can reduce the sensitivity of EMs and increase their thermal stability. , Therefore, “nitrogen-rich materials” have good advantages in balancing the contradiction between energy and sensitivity of energetic materials. , As for the primary explosives of the ECCs type, can “nitrogen-rich materials” also play a role? In our previous work, we designed a variety of ligands and their ECCs with heterocycles as the modifier and hydrazide as the coordination group, such as Cu(TZCA) 2 (ClO 4 ) 2 , Cu(AOCA) 2 (ClO 4 ) 2 , and Cu(PZCA) 2 (ClO 4 ) 2 . Although these ECCs have good detonation properties, they still have high mechanical sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, we designed a variety of ligands and their ECCs with heterocycles as the modifier and hydrazide as the coordination group, such as Cu(TZCA) 2 (ClO 4 ) 2 , 15 Cu(AOCA) 2 (ClO 4 ) 2 , 16 and Cu(PZCA) 2 (ClO 4 ) 2 . 17 Although these ECCs have good detonation properties, they still have high mechanical sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Study on Primary Explosive: Cu(ClO₄)₂-Based Energetic Coordination Compounds as a Template

Crystal Growth & Design

et al. 2023

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In order to study the design and preparation of new coordination primary explosive, the influence of ligand on the performance was explored. Using the low-energy, low-nitrogen pyrrole as the skeleton and the hydrazide group as the target, the ligand 1H-pyrrole-2-carbohydrazide (PRCA) was designed, the two ECCs [Cu(PRCA)2(H2O)(ClO4)]ClO4·C2H5OH (ECCs-1·C 2 H 5 OH) and [Cu(PRCA)2(H2O)(ClO4)]ClO4·2H2O (ECCs-1·2H 2 O) were prepared, and [Cu(PRCA)2(H2O)(ClO4)]ClO4 (ECCs-1) was obtained by a simple drying method. The structure of the target compound was confirmed by single-crystal X-ray diffraction, infrared (IR), and elemental analysis (EA) characterization. Physicochemical performance tests show that ECCs-1 has better thermal stability (T d = 219 °C) and is more sensitive to impact sensitivity (IS = 7 J) and friction sensitivity (FS = 16 N). The detonation performance prediction results show that the detonation velocity and pressure of ECCs-1 are not high (D EXPLO 5 = 6.2 km s–1, P EXPLO 5 = 16.2 GPa). However, detonation performance tests show that ECCs-1 has an extremely strong detonation ability.

“…Generally, increasing the nitrogen content can effectively increase the energy level of compounds. − Therefore, in our previous work (seen in Figure ), we designed and synthesized several ligands and related complexes, including Cu(TZCA) 2 (ClO 4 ) 4 , Cu(AOCA) 2 (ClO 4 ) 2 , and Cu(PZCA) 2 (ClO 4 ) 2 (TZCA: 1 H -tetrazole-5-carbohydrazide, AOCA: 4-amino-1,2,5-oxadiazole-3-carbohydrazide, PZCA: 1 H -pyrazole-4-carbohydrazide). These ECCs have good explosive performance, but their mechanical sensitivity is high.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Primary Explosive by Self-assembly of Combustible and Oxidizing Agents under Acid

Xie

et al. 2023

Inorg. Chem.

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In order to further explore the effect of ligands on the performance of primary explosives and gain a deeper understanding of the coordination mechanism, we designed furan-2-carbohydrazide (FRCA), a ligand, by using oxygen-containing heterocycles and carbohydrazide. Then, FRCA and Cu(ClO4)2 were used to synthesize coordination compounds [Cu(FRCA)2(H2O)(ClO4)2]·CH3OH (ECCs-1·CH 3 OH) and Cu(FRCA)2(H2O)(ClO4)2 (ECCs-1). The structure of the ECCs-1 was confirmed by single-crystal X-ray diffraction, IR and EA characterization. Further experiments on ECCs-1 show that ECCs-1 has good thermal stability, but is sensitive to mechanical stimuli (impact sensitivity = IS = 8 J, friction sensitivity = FS = 20 N). The predicted value of the detonation parameter is D EXPLO 5 = 6.6 km s–1, P EXPLO 5 = 18.8 GPa, but the ignition test, laser test, and lead plate detonation experiment show that ECCs-1 has excellent detonation performance, which is very worthy of attention.